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Scott Jr., 25,642 shares held of record by First Interstate Bank TTEE for Dana S Andersson GST Exempt Trust No 1 Dtd 12/11/2020, 25,642 shares held of record by First Interstate Bank TTEE for James R Scott Jr. GST Exempt Trust No 1 Dtd 12/11/2020."}],"balance_after":0,"derivative":{"exercise_price":0,"underlying":"Class A Common Stock","underlying_shares":149137},"source":{"system":"sec-edgar","filing":"0000899243-22-012682","document":"doc4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000089924322012682/doc4.xml","form_type":"4"}},{"id":2315960,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. Jr","position":1,"cik":"0001675872","reported_name":"Scott James R. 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Each of the reporting persons disclaims beneficial ownership of any such securities, except to the extent of its pecuniary interest therein. The reporting persons expect to file future Forms 4 and 5, if any, together with James R. Scott Jr."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Composed of 105,436 shares held of record by James R. Scott Jr., 25,642 shares held of record by First Interstate Bank TTEE for Dana S Andersson GST Exempt Trust No 1 Dtd 12/11/2020, 25,642 shares held of record by First Interstate Bank TTEE for James R Scott Jr. GST Exempt Trust No 1 Dtd 12/11/2020."}],"balance_after":156720,"source":{"system":"sec-edgar","filing":"0000899243-22-012682","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000089924322012682/doc4.xml","form_type":"4"}},{"id":2687768,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. Jr","position":1,"cik":"0001675872","reported_name":"Scott James R. 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The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above."}],"balance_after":5459,"source":{"system":"sec-edgar","filing":"0000860413-21-000124","document":"wf-form4_161524560827067.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041321000124/wf-form4_161524560827067.xml","form_type":"4"}},{"id":2804229,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. Jr","position":1,"cik":"0001675872","reported_name":"Scott James R. 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The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above."}],"balance_after":7408,"source":{"system":"sec-edgar","filing":"0000860413-21-000122","document":"wf-form4_161522534720243.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041321000122/wf-form4_161522534720243.xml","form_type":"4"}},{"id":2810086,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. Jr","position":1,"cik":"0001675872","reported_name":"Scott James R. 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The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above."}],"balance_after":19489,"source":{"system":"sec-edgar","filing":"0000860413-21-000118","document":"wf-form4_161489324728744.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041321000118/wf-form4_161489324728744.xml","form_type":"4"}},{"id":2828069,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. Jr","position":1,"cik":"0001675872","reported_name":"Scott James R. 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The conversion feature of the Class B Common Stock does not expire."},{"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."}],"balance_after":25642,"derivative":{"underlying":"Class A Common Stock","underlying_shares":25642},"source":{"system":"sec-edgar","filing":"0000860413-20-000264","document":"wf-form4_160805471125288.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041320000264/wf-form4_160805471125288.xml","form_type":"4"}},{"id":2945421,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. 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The conversion feature of the Class B Common Stock does not expire."},{"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."}],"balance_after":97853,"derivative":{"underlying":"Class A Common Stock","underlying_shares":51283},"source":{"system":"sec-edgar","filing":"0000860413-20-000264","document":"wf-form4_160805471125288.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041320000264/wf-form4_160805471125288.xml","form_type":"4"}},{"id":3128017,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. 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The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Amendment is only being filed to correct end of period holding. Shares in the amount 835 were incorrectly reported as being forfeited as taxes on 6/3/19 Form 4. This end of period holding reflects the addition of 835 shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"The Amendment is only being filed to correct the end of period holding. This holding reflects the removal of 251 shares incorrectly added to the end of period holding via footnote on 9/9/19 Form 4A."}],"balance_after":45127,"source":{"system":"sec-edgar","filing":"0000860413-19-000166","document":"wf-form4a_157316762299464.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000166/wf-form4a_157316762299464.xml","form_type":"4/A","original_submission_date":"2019-11-06"}},{"id":3379234,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. Jr","position":1,"cik":"0001675872","reported_name":"Scott James R. 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The reporting person undertakes to provide to First Interstate BancSystem, Inc., any security holder of First Interstate BancSystem, Inc., or the staff of the Securities and Exchange Commission, upon, request, the full information regarding the number of shares sold at each separate price within the ranges set forth above."}],"balance_after":44543,"source":{"system":"sec-edgar","filing":"0000860413-19-000163","document":"wf-form4_157306412048942.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000163/wf-form4_157306412048942.xml","form_type":"4"}},{"id":3419862,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. Jr","position":1,"cik":"0001675872","reported_name":"Scott James R. 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The conversion feature of the Class B Common Stock does not expire."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","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."}],"balance_after":46570,"derivative":{"underlying":"Class A Common Stock","underlying_shares":28575},"source":{"system":"sec-edgar","filing":"0000860413-19-000134","document":"wf-form4a_156804486613687.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/860413/000086041319000134/wf-form4a_156804486613687.xml","form_type":"4/A","original_submission_date":"2019-09-09"}},{"id":3419861,"issuer":{"id":4141,"kind":"organization","name":"FIRST INTERSTATE BANCSYSTEM INC","symbol":"FIBK"},"owners":[{"id":42026,"kind":"person","name":"Scott James R. 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