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The reporting person was granted 33,236 restricted stock units on the date of the grant, 16,618 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 16,618 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 in 3 to 5 business days from the date of vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of this total, 45,111 shares are Performance Based Restricted Stock Units and 34,385 shares are Restricted Stock Units."}],"balance_after":79496,"source":{"system":"sec-edgar","filing":"0001415889-24-004827","document":"form4-02222024_090222.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924004827/form4-02222024_090222.xml","form_type":"4"}},{"id":1697425,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 9-30-23."}],"balance_after":9811,"source":{"system":"sec-edgar","filing":"0001415889-23-013697","document":"form4-10022023_061021.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923013697/form4-10022023_061021.xml","form_type":"4"}},{"id":1840526,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 3-31-23."}],"balance_after":9737,"source":{"system":"sec-edgar","filing":"0001415889-23-005989","document":"form4-04042023_080453.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923005989/form4-04042023_080453.xml","form_type":"4"}},{"id":1977221,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Restricted Stock Units","published_at":"2023-03-03T22:23:29.000Z","date":"2023-02-21","kind":"grant","acquired":true,"shares":17892,"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 17,892 restricted stock units on the date of the grant, 8,946 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 8,946 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. 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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 32,631 shares held outright; 75,300 shares held at a broker and 56,986 shares of Restricted Stock Units."}],"balance_after":164917,"source":{"system":"sec-edgar","filing":"0001415889-23-003108","document":"form4-02232023_050219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923003108/form4-02232023_050219.xml","form_type":"4"}},{"id":1997647,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 12-31-22."}],"balance_after":9709,"source":{"system":"sec-edgar","filing":"0001415889-23-000024","document":"form4-01032023_080101.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923000024/form4-01032023_080101.xml","form_type":"4"}},{"id":2148261,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 9-30-22."}],"balance_after":9681,"source":{"system":"sec-edgar","filing":"0001415889-22-010054","document":"form4-10032022_091044.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922010054/form4-10032022_091044.xml","form_type":"4"}},{"id":2213404,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 6-30-22."}],"balance_after":9647,"source":{"system":"sec-edgar","filing":"0001415889-22-007516","document":"form4-07062022_020703.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922007516/form4-07062022_020703.xml","form_type":"4"}},{"id":2213403,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 3-31-22."}],"balance_after":9613,"source":{"system":"sec-edgar","filing":"0001415889-22-007516","document":"form4-07062022_020703.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922007516/form4-07062022_020703.xml","form_type":"4"}},{"id":2259070,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"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":"Included in this total are 75,300 shares held jointly with spouse with a broker, 17,428 shares held jointly with spouse outright, 41,510 shares are restricted stock units and 19,547 shares are Performance Based restricted stock units held in Mr. Adams' name alone."}],"balance_after":153785,"source":{"system":"sec-edgar","filing":"0001415889-22-001487","document":"form4-02172022_110219.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922001487/form4-02172022_110219.xml","form_type":"4"}},{"id":2452560,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 12-31-21."}],"balance_after":9578,"source":{"system":"sec-edgar","filing":"0001415889-22-000155","document":"form4-01042022_110149.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922000155/form4-01042022_110149.xml","form_type":"4"}},{"id":2606102,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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These shares have a 3-year cliff vesting."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Included in this total are 41,800 shares held jointly with spouse, 65,689 shares are restricted stock units and 35,726 shares are Performance Based restricted stock units  held in Mr. Adams' name alone."}],"balance_after":143215,"source":{"system":"sec-edgar","filing":"0001179110-21-001921","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021001921/edgar.xml","form_type":"4"}},{"id":3265356,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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These shares have a 3-year cliff vesting."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Included in this total are 41,800 shares held jointly with spouse, 54,963 shares are restricted stock units and 25,000 shares are Performance Based restricted stock units  held in Mr. Adams' name alone."}],"balance_after":121763,"source":{"system":"sec-edgar","filing":"0001179110-20-001801","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911020001801/edgar.xml","form_type":"4"}},{"id":3505804,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. Common Stock","published_at":"2019-06-03T20:55:01.000Z","date":"2019-05-31","kind":"grant","acquired":true,"shares":10196,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F3","text":"These shares represent Restricted Stock Units granted in 2019 under the Long Term Equity Incentive Program. These shares have a 3-year cliff vesting."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Included in this total are 41,800 shares held jointly with spouse, 43,196 are restricted stock units and 25,000 shares are Performance Based restricted stock units  held in Mr. Adams' name alone."}],"balance_after":109996,"source":{"system":"sec-edgar","filing":"0001179110-19-007017","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911019007017/edgar.xml","form_type":"4"}},{"id":3961553,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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These shares have a 3-year cliff vesting."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Included in this total are 41,800 shares held jointly with spouse, 33,000 are restricted stock units and 25,000 shares are Performance Based restricted stock units  held in Mr. Adams' name alone."}],"balance_after":99800,"source":{"system":"sec-edgar","filing":"0001179110-18-005779","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018005779/edgar.xml","form_type":"4"}},{"id":4042311,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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These shares have a 3-year cliff vesting."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Of this total, 41,800 shares are held jointly with spouse and 33,000 are restricted stock units held in Mr. Adams' name alone."}],"balance_after":74800,"source":{"system":"sec-edgar","filing":"0001179110-18-002580","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018002580/edgar.xml","form_type":"4"}},{"id":4297201,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33496,"kind":"person","name":"ADAMS BRADLEY S.","position":1,"cik":"0001598917","reported_name":"ADAMS BRADLEY S.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CFO"}}],"security":"Old Second Bancorp, Inc. 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