{"transactions":[{"id":3654867,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-15T17:13:52.000Z","date":"2019-02-13","kind":"gift","acquired":true,"shares":1000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Limited Partnership"},"balance_after":31000,"source":{"system":"sec-edgar","filing":"0000860413-19-000013","document":"wf-form4_155025081765278.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000013/wf-form4_155025081765278.xml","form_type":"4"}},{"id":3654866,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-15T17:13:52.000Z","date":"2019-02-13","kind":"gift","acquired":false,"shares":1000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"balance_after":104896,"source":{"system":"sec-edgar","filing":"0000860413-19-000013","document":"wf-form4_155025081765278.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000013/wf-form4_155025081765278.xml","form_type":"4"}},{"id":3654865,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-15T17:13:52.000Z","date":"2019-02-12","kind":"gift","acquired":true,"shares":400,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA"},"balance_after":1440,"source":{"system":"sec-edgar","filing":"0000860413-19-000013","document":"wf-form4_155025081765278.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000013/wf-form4_155025081765278.xml","form_type":"4"}},{"id":3654864,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-15T17:13:52.000Z","date":"2019-02-12","kind":"gift","acquired":true,"shares":400,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA -2"},"balance_after":2600,"source":{"system":"sec-edgar","filing":"0000860413-19-000013","document":"wf-form4_155025081765278.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000013/wf-form4_155025081765278.xml","form_type":"4"}},{"id":3654863,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-15T17:13:52.000Z","date":"2019-02-12","kind":"gift","acquired":true,"shares":400,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA -1"},"balance_after":2600,"source":{"system":"sec-edgar","filing":"0000860413-19-000013","document":"wf-form4_155025081765278.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000013/wf-form4_155025081765278.xml","form_type":"4"}},{"id":3654862,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-15T17:13:52.000Z","date":"2019-02-12","kind":"gift","acquired":false,"shares":25200,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Total includes 10,867 shares of Class A Common Stock transferred On February 12, 2019."}],"balance_after":105896,"source":{"system":"sec-edgar","filing":"0000860413-19-000013","document":"wf-form4_155025081765278.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000013/wf-form4_155025081765278.xml","form_type":"4"}},{"id":3671136,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2019-02-07T22:26:31.000Z","date":"2019-02-06","kind":"exercise","acquired":false,"shares":5801,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":13.6,"exercise_date":"2012-05-23","expiration_date":"2022-05-23","underlying":"Class A Common Stock","underlying_shares":5801},"source":{"system":"sec-edgar","filing":"0000860413-19-000009","document":"wf-form4_154957837717290.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000009/wf-form4_154957837717290.xml","form_type":"4"}},{"id":3671135,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2019-02-07T22:26:31.000Z","date":"2019-02-06","kind":"exercise","acquired":false,"shares":3094,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":13.25,"exercise_date":"2011-05-24","expiration_date":"2021-05-24","underlying":"Class A Common Stock","underlying_shares":3094},"source":{"system":"sec-edgar","filing":"0000860413-19-000009","document":"wf-form4_154957837717290.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000009/wf-form4_154957837717290.xml","form_type":"4"}},{"id":3671134,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2019-02-07T22:26:31.000Z","date":"2019-02-06","kind":"exercise","acquired":false,"shares":1972,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":15.91,"exercise_date":"2010-05-07","expiration_date":"2020-05-07","underlying":"Class A Common Stock","underlying_shares":1972},"source":{"system":"sec-edgar","filing":"0000860413-19-000009","document":"wf-form4_154957837717290.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000009/wf-form4_154957837717290.xml","form_type":"4"}},{"id":3671133,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-07T22:26:31.000Z","date":"2019-02-06","kind":"exercise","acquired":true,"shares":5801,"price":13.3,"value":77153.3,"ownership":{"direct":true},"balance_after":10867,"source":{"system":"sec-edgar","filing":"0000860413-19-000009","document":"wf-form4_154957837717290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000009/wf-form4_154957837717290.xml","form_type":"4"}},{"id":3671132,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-07T22:26:31.000Z","date":"2019-02-06","kind":"exercise","acquired":true,"shares":3094,"price":13.25,"value":40995.5,"ownership":{"direct":true},"balance_after":5066,"source":{"system":"sec-edgar","filing":"0000860413-19-000009","document":"wf-form4_154957837717290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000009/wf-form4_154957837717290.xml","form_type":"4"}},{"id":3671131,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2019-02-07T22:26:31.000Z","date":"2019-02-06","kind":"exercise","acquired":true,"shares":1972,"price":15.91,"value":31374.52,"ownership":{"direct":true},"balance_after":1972,"source":{"system":"sec-edgar","filing":"0000860413-19-000009","document":"wf-form4_154957837717290.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000009/wf-form4_154957837717290.xml","form_type":"4"}},{"id":3909507,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2018-06-04T15:45:26.000Z","date":"2018-06-01","kind":"grant","acquired":true,"shares":572,"price":43.65,"value":24967.8,"ownership":{"direct":true},"balance_after":572,"source":{"system":"sec-edgar","filing":"0000860413-18-000094","document":"wf-form4_152812705923159.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000094/wf-form4_152812705923159.xml","form_type":"4"}},{"id":3911627,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2018-06-01T21:25:43.000Z","date":"2018-05-30","kind":"gift","acquired":true,"shares":1000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Limited Partnership"},"balance_after":30000,"source":{"system":"sec-edgar","filing":"0000860413-18-000090","document":"wf-form4_152788833002789.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000090/wf-form4_152788833002789.xml","form_type":"4"}},{"id":3911626,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2018-06-01T21:25:43.000Z","date":"2018-05-30","kind":"gift","acquired":true,"shares":320,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA"},"balance_after":1040,"source":{"system":"sec-edgar","filing":"0000860413-18-000090","document":"wf-form4_152788833002789.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000090/wf-form4_152788833002789.xml","form_type":"4"}},{"id":3911625,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Commnon Stock","published_at":"2018-06-01T21:25:43.000Z","date":"2018-05-30","kind":"gift","acquired":true,"shares":320,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA -2"},"balance_after":2200,"source":{"system":"sec-edgar","filing":"0000860413-18-000090","document":"wf-form4_152788833002789.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000090/wf-form4_152788833002789.xml","form_type":"4"}},{"id":3911624,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Commnon Stock","published_at":"2018-06-01T21:25:43.000Z","date":"2018-05-30","kind":"gift","acquired":true,"shares":320,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA -1"},"balance_after":2200,"source":{"system":"sec-edgar","filing":"0000860413-18-000090","document":"wf-form4_152788833002789.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000090/wf-form4_152788833002789.xml","form_type":"4"}},{"id":3911623,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2018-06-01T21:25:43.000Z","date":"2018-05-30","kind":"gift","acquired":false,"shares":1960,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"balance_after":119657,"source":{"system":"sec-edgar","filing":"0000860413-18-000090","document":"wf-form4_152788833002789.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000090/wf-form4_152788833002789.xml","form_type":"4"}},{"id":4071144,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock","published_at":"2018-02-08T22:16:56.000Z","date":"2018-02-07","kind":"exercise","acquired":false,"shares":1960,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."}],"balance_after":0,"derivative":{"exercise_price":0,"underlying":"Class A Commnon Stock","underlying_shares":1960},"source":{"system":"sec-edgar","filing":"0000860413-18-000010","document":"wf-form4_151812819093262.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000010/wf-form4_151812819093262.xml","form_type":"4"}},{"id":4071143,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock","published_at":"2018-02-08T22:16:56.000Z","date":"2018-02-07","kind":"exercise","acquired":true,"shares":1960,"price":15.25,"value":29890.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."}],"balance_after":1960,"derivative":{"exercise_price":0,"underlying":"Class A Commnon Stock","underlying_shares":1960},"source":{"system":"sec-edgar","filing":"0000860413-18-000010","document":"wf-form4_151812819093262.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000010/wf-form4_151812819093262.xml","form_type":"4"}},{"id":4071142,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2018-02-08T22:16:56.000Z","date":"2018-02-07","kind":"exercise","acquired":false,"shares":1960,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":15.25,"exercise_date":"2009-05-15","expiration_date":"2019-05-15","underlying":"Class B Common Stock","underlying_shares":1960},"source":{"system":"sec-edgar","filing":"0000860413-18-000010","document":"wf-form4_151812819093262.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000010/wf-form4_151812819093262.xml","form_type":"4"}},{"id":4071141,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock","published_at":"2018-02-08T22:16:56.000Z","date":"2018-02-07","kind":"exercise","acquired":false,"shares":2504,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."}],"balance_after":0,"derivative":{"exercise_price":0,"underlying":"Class A Common Stock","underlying_shares":2504},"source":{"system":"sec-edgar","filing":"0000860413-18-000010","document":"wf-form4_151812819093262.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000010/wf-form4_151812819093262.xml","form_type":"4"}},{"id":4071140,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock","published_at":"2018-02-08T22:16:56.000Z","date":"2018-02-07","kind":"exercise","acquired":true,"shares":2504,"price":20.87,"value":52258.48,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder.  The conversion feature of the Class B Common Stock does not expire and the reporting person elected to convert the shares upon receipt."}],"balance_after":2504,"derivative":{"exercise_price":0,"underlying":"Class A Common Stock","underlying_shares":2504},"source":{"system":"sec-edgar","filing":"0000860413-18-000010","document":"wf-form4_151812819093262.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000010/wf-form4_151812819093262.xml","form_type":"4"}},{"id":4071139,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2018-02-08T22:16:56.000Z","date":"2018-02-07","kind":"exercise","acquired":false,"shares":2504,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":20.87,"exercise_date":"2008-05-09","expiration_date":"2018-05-09","underlying":"Class B Common Stock","underlying_shares":2504},"source":{"system":"sec-edgar","filing":"0000860413-18-000010","document":"wf-form4_151812819093262.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000010/wf-form4_151812819093262.xml","form_type":"4"}},{"id":4071138,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2018-02-08T22:16:56.000Z","date":"2018-02-07","kind":"exercise","acquired":true,"shares":1960,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"balance_after":121617,"source":{"system":"sec-edgar","filing":"0000860413-18-000010","document":"wf-form4_151812819093262.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000010/wf-form4_151812819093262.xml","form_type":"4"}},{"id":4071137,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2018-02-08T22:16:56.000Z","date":"2018-02-07","kind":"exercise","acquired":true,"shares":2504,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"balance_after":119657,"source":{"system":"sec-edgar","filing":"0000860413-18-000010","document":"wf-form4_151812819093262.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041318000010/wf-form4_151812819093262.xml","form_type":"4"}},{"id":4296920,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2017-06-02T19:24:52.000Z","date":"2017-06-01","kind":"grant","acquired":true,"shares":716,"price":34.9,"value":24988.4,"ownership":{"direct":false,"nature":"By Trust"},"balance_after":117153,"source":{"system":"sec-edgar","filing":"0001209191-17-037117","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117037117/doc4.xml","form_type":"4"}},{"id":4302020,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2017-05-30T23:06:13.000Z","date":"2017-05-26","kind":"gift","acquired":true,"shares":380,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA"},"balance_after":720,"source":{"system":"sec-edgar","filing":"0001209191-17-036270","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117036270/doc4.xml","form_type":"4"}},{"id":4302019,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2017-05-30T23:06:13.000Z","date":"2017-05-26","kind":"gift","acquired":true,"shares":380,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA"},"balance_after":1880,"source":{"system":"sec-edgar","filing":"0001209191-17-036270","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117036270/doc4.xml","form_type":"4"}},{"id":4302018,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2017-05-30T23:06:13.000Z","date":"2017-05-26","kind":"gift","acquired":true,"shares":380,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA"},"balance_after":1880,"source":{"system":"sec-edgar","filing":"0001209191-17-036270","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117036270/doc4.xml","form_type":"4"}},{"id":4302017,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2017-05-30T23:06:13.000Z","date":"2017-05-26","kind":"gift","acquired":false,"shares":1140,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"balance_after":116437,"source":{"system":"sec-edgar","filing":"0001209191-17-036270","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117036270/doc4.xml","form_type":"4"}},{"id":4338967,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock","published_at":"2017-05-02T23:59:11.000Z","date":"2017-04-28","kind":"exercise","acquired":false,"shares":5916,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire, and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire, and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire, and the reporting person elected to convert the shares upon receipt."}],"balance_after":0,"derivative":{"exercise_price":0,"underlying":"Class A Common Stock","underlying_shares":5916},"source":{"system":"sec-edgar","filing":"0001209191-17-029458","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117029458/doc4.xml","form_type":"4"}},{"id":4338966,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class B Common Stock","published_at":"2017-05-02T23:59:11.000Z","date":"2017-04-28","kind":"exercise","acquired":true,"shares":5916,"price":22.25,"value":131631.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire, and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire, and the reporting person elected to convert the shares upon receipt."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"The Class B Common Stock is convertible at any time into Class A Common Stock on a share for share basis at the discretion of the holder. The conversion feature of the Class B Common Stock does not expire, and the reporting person elected to convert the shares upon receipt."}],"balance_after":5916,"derivative":{"exercise_price":0,"underlying":"Class A Common Stock","underlying_shares":5916},"source":{"system":"sec-edgar","filing":"0001209191-17-029458","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117029458/doc4.xml","form_type":"4"}},{"id":4338965,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Options (Right to Buy)","published_at":"2017-05-02T23:59:11.000Z","date":"2017-04-28","kind":"exercise","acquired":false,"shares":5916,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":0,"derivative":{"exercise_price":22.25,"exercise_date":"2007-05-04","expiration_date":"2017-05-04","underlying":"Class B Common Stock","underlying_shares":5916},"source":{"system":"sec-edgar","filing":"0001209191-17-029458","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117029458/doc4.xml","form_type":"4"}},{"id":4338964,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2017-05-02T23:59:11.000Z","date":"2017-04-28","kind":"exercise","acquired":true,"shares":5916,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":5916,"source":{"system":"sec-edgar","filing":"0001209191-17-029458","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919117029458/doc4.xml","form_type":"4"}},{"id":4521209,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2016-12-15T21:10:02.000Z","date":"2016-04-28","kind":"gift","acquired":true,"shares":500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As custodian under UGMA"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of an immediate family member not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of an immediate family member not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."}],"balance_after":1500,"source":{"system":"sec-edgar","filing":"0001209191-16-155386","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919116155386/doc4a.xml","form_type":"4/A","original_submission_date":"2016-05-02"}},{"id":4521208,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2016-12-15T21:10:02.000Z","date":"2016-04-28","kind":"gift","acquired":true,"shares":500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As custodian under UGMA"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of an immediate family member not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of an immediate family member not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."}],"balance_after":1500,"source":{"system":"sec-edgar","filing":"0001209191-16-155386","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919116155386/doc4a.xml","form_type":"4/A","original_submission_date":"2016-05-02"}},{"id":4521205,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2016-12-15T20:59:27.000Z","date":"2015-05-07","kind":"gift","acquired":true,"shares":500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As custodian under UGMA"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of an immediate family member not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of an immediate family member not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."}],"balance_after":1000,"source":{"system":"sec-edgar","filing":"0001209191-16-155377","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919116155377/doc4a.xml","form_type":"4/A","original_submission_date":"2015-05-07"}},{"id":4521204,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2016-12-15T20:59:27.000Z","date":"2015-05-07","kind":"gift","acquired":true,"shares":500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As custodian under UGMA"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of an immediate family member not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of an immediate family member not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."}],"balance_after":1000,"source":{"system":"sec-edgar","filing":"0001209191-16-155377","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919116155377/doc4a.xml","form_type":"4/A","original_submission_date":"2015-05-07"}},{"id":4521207,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2016-12-15T20:48:15.000Z","date":"2014-11-18","kind":"gift","acquired":true,"shares":500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of immediate family members not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of immediate family members not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."}],"balance_after":500,"source":{"system":"sec-edgar","filing":"0001209191-16-155374","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919116155374/doc4a.xml","form_type":"4/A","original_submission_date":"2014-11-18"}},{"id":4521206,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2016-12-15T20:48:15.000Z","date":"2014-11-18","kind":"gift","acquired":true,"shares":500,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of immediate family members not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This amendment is filed to report the deemed simultaneous acquisition by gift of indirect beneficial ownership by the reporting person, as custodian of the shares for the sole benefit of immediate family members not sharing the reporting person's home, of the same number of shares previously properly reported as disposed of by the reporting person by gift in the Form 4 originally filed."}],"balance_after":500,"source":{"system":"sec-edgar","filing":"0001209191-16-155374","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919116155374/doc4a.xml","form_type":"4/A","original_submission_date":"2014-11-18"}},{"id":4521203,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2016-12-15T20:39:49.000Z","date":"2016-12-13","kind":"gift","acquired":true,"shares":340,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"As Custodian under UGMA"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"This transaction involved a gift of securities by the reporting person to a family member trust under the Uniform Gift to Minors Act, and for which the reporting person acts as custodian of the trust.  Reporting person disclaims beneficial ownership of the shares except to the extent of his pecuniary interest in such shares."}],"balance_after":340,"source":{"system":"sec-edgar","filing":"0001209191-16-155372","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919116155372/doc4.xml","form_type":"4"}},{"id":4521202,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":160214,"kind":"person","name":"EBZERY WILLIAM B","position":1,"cik":"0001198514","reported_name":"EBZERY WILLIAM B","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Class A Common Stock","published_at":"2016-12-15T20:39:49.000Z","date":"2016-12-13","kind":"gift","acquired":false,"shares":340,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Trust"},"balance_after":111661,"source":{"system":"sec-edgar","filing":"0001209191-16-155372","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000120919116155372/doc4.xml","form_type":"4"}}]}