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Information herein was provided by the Plan Trustee as of 3-31-26."}],"balance_after":12606,"source":{"system":"sec-edgar","filing":"0001840027-26-000010","document":"form4-04022026_010440.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000184002726000010/form4-04022026_010440.xml","form_type":"4"}},{"id":863807,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Actual performance exceeded the target performance for the performance period which resulted in an additional grant of 1,938 shares."}],"balance_after":26565,"source":{"system":"sec-edgar","filing":"0001840027-26-000008","document":"form4-03042026_070322.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000184002726000008/form4-03042026_070322.xml","form_type":"4"}},{"id":886729,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Restricted Stock Units","published_at":"2026-02-24T23:50:14.000Z","date":"2026-02-21","kind":"tax_withholding","planned":false,"acquired":false,"shares":894,"price":20.57,"value":18389.58,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Represents shares withheld by the issuer to satisfy applicable tax withholding obligations in connection with the vesting of 2,585 previously reported time-based restricted stock units, the remaining shares of which were issued and added to the reporting person's common stock holdings."}],"balance_after":23879,"source":{"system":"sec-edgar","filing":"0001840027-26-000006","document":"form4-02242026_110210.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000184002726000006/form4-02242026_110210.xml","form_type":"4"}},{"id":886728,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Restricted Stock Units","published_at":"2026-02-24T23:50:14.000Z","date":"2026-02-17","kind":"grant","planned":false,"acquired":true,"shares":5912,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 5,912 restricted stock units on the date of the grant, 2,956 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 2,956 of which are performance-based restricted stock units that may vest and convert to shares within a range from 0% to 175% of the underlying performance-based restricted stock units originally awarded, depending on our compensation committee approved performance metrics. 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Information was provided herein by the Plan Trustee as of 12-31-25."}],"balance_after":12563,"source":{"system":"sec-edgar","filing":"0001840027-26-000002","document":"form4-01052026_110110.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000184002726000002/form4-01052026_110110.xml","form_type":"4"}},{"id":1030138,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information was provided herein by the Plan Trustee as of 9-30-25."}],"balance_after":12516,"source":{"system":"sec-edgar","filing":"0001840027-25-000004","document":"form4-10012025_081035.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000184002725000004/form4-10012025_081035.xml","form_type":"4"}},{"id":1090988,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the plan trustee as of 6-30-25."}],"balance_after":12472,"source":{"system":"sec-edgar","filing":"0001415889-25-019453","document":"form4-07082025_010729.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588925019453/form4-07082025_010729.xml","form_type":"4"}},{"id":1187335,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the plan trustee as of 3-31-25."}],"balance_after":12425,"source":{"system":"sec-edgar","filing":"0001415889-25-009391","document":"form4-04012025_080428.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588925009391/form4-04012025_080428.xml","form_type":"4"}},{"id":1192848,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Restricted Stock Units","published_at":"2025-03-25T14:31:51.000Z","date":"2025-03-11","kind":"grant","planned":false,"acquired":true,"shares":2724,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 2,724 restricted stock units on the date of grant, 1,362 of which are time-based restricted stock units that vest on the third anniversary of the grant date and 1,362 of which are performance-based restricted stock units that may vest and convert to shares within a range from 0% to 150% of the underlying performance-based restricted stock units originally awarded, depending on our compensation committee approved performance metrics. Vested shares, if any, will be delivered to the reporting person within 3 to 5 business days from the date of vesting."}],"balance_after":20552,"source":{"system":"sec-edgar","filing":"0001415889-25-008881","document":"form4-03252025_020348.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588925008881/form4-03252025_020348.xml","form_type":"4"}},{"id":1254377,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Restricted Stock Units","published_at":"2025-02-21T20:57:44.000Z","date":"2025-02-19","kind":"grant","planned":false,"acquired":true,"shares":5508,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 5,508 restricted stock units on the date of the grant, 2,754 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 2,754 of which are performance-based restricted stock units that may vest and convert to shares within a range from 0% to 175% of the underlying performance-based restricted stock units originally awarded, depending on our compensation committee approved performance metrics. Vested shares, if any, will be delivered to the reporting person in 3 to 5 business days from the date of vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of this total, 8,914 shares are performance-based restricted stock units and 8,914 are time-based restricted stock units."}],"balance_after":17828,"source":{"system":"sec-edgar","filing":"0001415889-25-005029","document":"form4-02212025_080240.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588925005029/form4-02212025_080240.xml","form_type":"4"}},{"id":1319307,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 12-31-24."}],"balance_after":12177,"source":{"system":"sec-edgar","filing":"0001415889-25-000056","document":"form4-01022025_060159.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588925000056/form4-01022025_060159.xml","form_type":"4"}},{"id":1391184,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 09-30-24."}],"balance_after":12132,"source":{"system":"sec-edgar","filing":"0001415889-24-024738","document":"form4-10042024_061035.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924024738/form4-10042024_061035.xml","form_type":"4"}},{"id":1464673,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the plan Trustee as of 6-30-24."}],"balance_after":12074,"source":{"system":"sec-edgar","filing":"0001415889-24-018823","document":"form4-07022024_050720.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924018823/form4-07022024_050720.xml","form_type":"4"}},{"id":1464672,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the plan Trustee as of 3-31-24."}],"balance_after":11964,"source":{"system":"sec-edgar","filing":"0001415889-24-018823","document":"form4-07022024_050720.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924018823/form4-07022024_050720.xml","form_type":"4"}},{"id":1627119,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Restricted Stock Units","published_at":"2024-02-22T22:42:34.000Z","date":"2024-02-20","kind":"grant","planned":false,"acquired":true,"shares":7150,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 7,150 restricted stock units on the date of the grant, 3,575 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 3,575 of which are performance-based restricted stock units that may vest and convert to shares within a range from 0% to 175% of the underlying performance-based restricted stock units originally awarded, depending on our compensation committee approved performance metrics. Vested shares, if any, will be delivered to the reporting person in 3 to 5 business days from the date of vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Included in this total are 6,160 shares of Performance Based Restricted Stock Units and 10,223 shares of Restricted Stock Units."}],"balance_after":16383,"source":{"system":"sec-edgar","filing":"0001415889-24-004894","document":"form4-02222024_100213.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924004894/form4-02222024_100213.xml","form_type":"4"}},{"id":1697421,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the plan Trustee as of 12-31-2023."}],"balance_after":11693,"source":{"system":"sec-edgar","filing":"0001415889-24-000058","document":"form4-01022024_090101.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924000058/form4-01022024_090101.xml","form_type":"4"}},{"id":1771091,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 9-30-23."}],"balance_after":11634,"source":{"system":"sec-edgar","filing":"0001415889-23-013689","document":"form4-10022023_061041.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923013689/form4-10022023_061041.xml","form_type":"4"}},{"id":1840530,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. Common Stock","published_at":"2023-07-03T19:59:42.000Z","date":"2023-06-30","kind":"grant","planned":false,"acquired":true,"shares":140,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By 401-K"},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Of this total, 140 shares were allocated during the second quarter pursuant to the Old Second Bancorp, Inc. Employee Salary and Savings Plan. Information herein was provided by the Plan Trustee as of 6-30-23."}],"balance_after":11527,"source":{"system":"sec-edgar","filing":"0001415889-23-010554","document":"form4-07032023_070739.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923010554/form4-07032023_070739.xml","form_type":"4"}},{"id":1930982,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 3-31-23."}],"balance_after":11387,"source":{"system":"sec-edgar","filing":"0001415889-23-005974","document":"form4-04042023_070416.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923005974/form4-04042023_070416.xml","form_type":"4"}},{"id":1977224,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Restricted Stock Units","published_at":"2023-03-03T22:31:08.000Z","date":"2023-02-21","kind":"grant","acquired":true,"shares":5170,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Each restricted stock unit represents a contingent right to receive one share of common stock. The reporting person was granted 5,170 restricted stock units on the date of grant, 2,585 of which are time-based restricted stock units that vest on the third anniversary of the grant date and 2,585 of which are performance-based restricted stock units that may vest and convert to shares within a range from 0% to 150% of the underlying performance-based restricted stock units originally awarded, depending on our compensation committee approved performance metrics. Vested shares, if any, will be delivered to the reporting person within 3 to 5 business days from the date of vesting."}],"balance_after":14187,"source":{"system":"sec-edgar","filing":"0001415889-23-004179","document":"form4a-03032023_100333.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923004179/form4a-03032023_100333.xml","form_type":"4/A","original_submission_date":"2023-02-21"}},{"id":1985294,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. Common Stock","published_at":"2023-03-01T22:08:20.000Z","date":"2023-03-01","kind":"grant","acquired":true,"shares":5170,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The amount of Restricted Stock Units beneficially owned was incorrectly disclosed due to a calculation error. This amendment corrects the number of beneficially owned Restricted Stock Units granted from 16,492 to 5,170."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Included in this total are 2,893 shares held outright; 18,082.667 shares held with a broker and 14,187 shares of Restricted Stock Units."}],"balance_after":35162.667,"source":{"system":"sec-edgar","filing":"0001415889-23-003688","document":"form4a-03012023_100304.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923003688/form4a-03012023_100304.xml","form_type":"4/A","original_submission_date":"2023-02-21"}},{"id":1997656,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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These shares have a 3-year cliff vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Included in this total are 2,893 shares held outright; 25,509 shares of Restricted Stock Units and 18,082.667 shares held with a broker."}],"balance_after":46484.667,"source":{"system":"sec-edgar","filing":"0001415889-23-003131","document":"form4-02232023_060231.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923003131/form4-02232023_060231.xml","form_type":"4"}},{"id":1997655,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information was provided herein by the Plan Trustee as of 12-31-22."}],"balance_after":11231,"source":{"system":"sec-edgar","filing":"0001415889-23-000055","document":"form4-01032023_090151.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923000055/form4-01032023_090151.xml","form_type":"4"}},{"id":2148267,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 9-30-22."}],"balance_after":7220,"source":{"system":"sec-edgar","filing":"0001415889-22-010094","document":"form4-10032022_031046.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922010094/form4-10032022_031046.xml","form_type":"4"}},{"id":2213397,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of  6-30-22."}],"balance_after":7155,"source":{"system":"sec-edgar","filing":"0001415889-22-007508","document":"form4-07062022_020748.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922007508/form4-07062022_020748.xml","form_type":"4"}},{"id":2213396,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of  3-31-22."}],"balance_after":7058,"source":{"system":"sec-edgar","filing":"0001415889-22-007508","document":"form4-07062022_020748.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922007508/form4-07062022_020748.xml","form_type":"4"}},{"id":2259072,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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These shares have a three-year cliff vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of this total, 2,280 shares are held solely, 12,922.541 shares are held in a broker account and 17,490 share are restricted stock units."}],"balance_after":32692.541,"source":{"system":"sec-edgar","filing":"0001415889-22-001490","document":"form4-02172022_110211.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922001490/form4-02172022_110211.xml","form_type":"4"}},{"id":2452555,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information was provided herein by the Plan Trustee as of 12-31-21."}],"balance_after":6873,"source":{"system":"sec-edgar","filing":"0001415889-22-000150","document":"form4-01042022_110155.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922000150/form4-01042022_110155.xml","form_type":"4"}},{"id":2550592,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information was provided herein by the Plan Trustee as of 9-30-21."}],"balance_after":6827,"source":{"system":"sec-edgar","filing":"0001415889-21-004734","document":"form4-10052021_091029.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588921004734/form4-10052021_091029.xml","form_type":"4"}},{"id":2648968,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. Common Stock","published_at":"2021-07-01T20:04:51.000Z","date":"2021-06-30","kind":"grant","acquired":true,"shares":95,"ownership":{"direct":false,"nature":"401-K"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Of this total, 95 shares were allocated during the second quarter pursuant to the Old Second Bancorp, Inc. Employee Savings Plan & Trust. Information herein was provided by the Plan Trustee as of 06-30-21."}],"balance_after":6717,"source":{"system":"sec-edgar","filing":"0001179110-21-007238","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021007238/edgar.xml","form_type":"4"}},{"id":2762823,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 03-31-21."}],"balance_after":6622,"source":{"system":"sec-edgar","filing":"0001179110-21-004106","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021004106/edgar.xml","form_type":"4"}},{"id":2804474,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. Common Stock","published_at":"2021-03-08T17:50:50.000Z","date":"2021-03-08","kind":"sale","acquired":false,"shares":1500,"price":13.63,"value":20445.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Of this total, 12,922.541 shares are held in Trust with spouse, 2,280 shares are held in his name alone and 13,427 shares are restricted stock units."}],"balance_after":28629.541,"source":{"system":"sec-edgar","filing":"0001179110-21-003028","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021003028/edgar.xml","form_type":"4"}},{"id":2841633,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. Common Stock","published_at":"2021-02-23T22:59:47.000Z","date":"2021-02-20","kind":"other","acquired":false,"shares":1206,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"These shares represent vested Restricted Stock Units disposed of to cover a tax liability."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Of this total, 14,422.541 shares are held in Trust with spouse, 2,280 shares are held in his name alone and 13,427 shares are restricted stock units."}],"balance_after":30129.541,"source":{"system":"sec-edgar","filing":"0001179110-21-002149","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021002149/edgar.xml","form_type":"4"}},{"id":2852588,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33493,"kind":"person","name":"Gartelmann Richard A JR","position":1,"cik":"0001840027","reported_name":"Gartelmann Richard A JR","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. Common Stock","published_at":"2021-02-18T23:46:49.000Z","date":"2021-02-16","kind":"grant","acquired":true,"shares":4954,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"These shares represent restricted stock units granted pursuant to the 2019 Long Term Incentive Plan. These shares have a 3-year cliff vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Of this total, 14,422.541 shares are held in Trust with spouse and 16,913 shares are restricted stock units."}],"balance_after":31335.541,"source":{"system":"sec-edgar","filing":"0001179110-21-001920","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021001920/edgar.xml","form_type":"4"}}]}