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Information herein was provided by the plan Trustee as of 6-30-24."}],"balance_after":3928,"source":{"system":"sec-edgar","filing":"0001415889-24-018829","document":"form4-07022024_050746.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924018829/form4-07022024_050746.xml","form_type":"4"}},{"id":1464680,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":179,"source":{"system":"sec-edgar","filing":"0001415889-24-018829","document":"form4-07022024_050746.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924018829/form4-07022024_050746.xml","form_type":"4"}},{"id":1464678,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":178,"source":{"system":"sec-edgar","filing":"0001415889-24-018829","document":"form4-07022024_050746.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924018829/form4-07022024_050746.xml","form_type":"4"}},{"id":1627120,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Restricted Stock Units","published_at":"2024-02-22T22:47:45.000Z","date":"2024-02-20","kind":"grant","planned":false,"acquired":true,"shares":16064,"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 16,064 restricted stock units on the date of the grant, 8,032 of which are time-based restricted stock units that vest on the third anniversary of the grant date, and 8,032 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, 13,288 shares are Performance Based Restricted Stock Units and 21,548 shares of Restricted Stock Units."}],"balance_after":34836,"source":{"system":"sec-edgar","filing":"0001415889-24-004897","document":"form4-02222024_100238.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588924004897/form4-02222024_100238.xml","form_type":"4"}},{"id":1697423,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":177,"source":{"system":"sec-edgar","filing":"0001415889-23-013693","document":"form4-10022023_061048.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923013693/form4-10022023_061048.xml","form_type":"4"}},{"id":1840531,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":3857,"source":{"system":"sec-edgar","filing":"0001415889-23-005984","document":"form4-04042023_070455.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923005984/form4-04042023_070455.xml","form_type":"4"}},{"id":1930985,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":176,"source":{"system":"sec-edgar","filing":"0001415889-23-005984","document":"form4-04042023_070455.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923005984/form4-04042023_070455.xml","form_type":"4"}},{"id":1977223,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Restricted Stock Units","published_at":"2023-03-03T22:27:10.000Z","date":"2023-02-21","kind":"grant","acquired":true,"shares":10512,"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 10,512 restricted stock units on the date of grant, 5,256 of which are time-based restricted stock units that cliff vest on the third anniversary of the grant date, and 5,256 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."}],"balance_after":28880,"source":{"system":"sec-edgar","filing":"0001415889-23-004176","document":"form4a-03032023_100300.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923004176/form4a-03032023_100300.xml","form_type":"4/A","original_submission_date":"2023-02-21"}},{"id":1985295,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc. 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This amendment corrects the number of beneficially owned Restricted Stock Units granted from 16,492 to 10,512."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Included in this total are 6,033 shares held outright, 44,923 shares held with a broker and 28,880 shares of Restricted Stock Units."}],"balance_after":79836,"source":{"system":"sec-edgar","filing":"0001415889-23-003690","document":"form4a-03012023_100340.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923003690/form4a-03012023_100340.xml","form_type":"4/A","original_submission_date":"2023-02-21"}},{"id":1997664,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 6,033 shares held outright; 44,923 shares held with a broker and 34,860 shares of Restricted Stock Units."}],"balance_after":85816,"source":{"system":"sec-edgar","filing":"0001415889-23-003146","document":"form4-02232023_070228.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923003146/form4-02232023_070228.xml","form_type":"4"}},{"id":1997663,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 12-31-22."}],"balance_after":175,"source":{"system":"sec-edgar","filing":"0001415889-23-000028","document":"form4-01032023_080155.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588923000028/form4-01032023_080155.xml","form_type":"4"}},{"id":2073690,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":3834,"source":{"system":"sec-edgar","filing":"0001415889-22-010065","document":"form4-10032022_121007.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922010065/form4-10032022_121007.xml","form_type":"4"}},{"id":2213400,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":3807,"source":{"system":"sec-edgar","filing":"0001415889-22-007512","document":"form4-07062022_020720.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922007512/form4-07062022_020720.xml","form_type":"4"}},{"id":2213398,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":173,"source":{"system":"sec-edgar","filing":"0001415889-22-007512","document":"form4-07062022_020720.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922007512/form4-07062022_020720.xml","form_type":"4"}},{"id":2259073,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":"Included in this total are 39,818 shares held in a brokerage account, 34,641 shares of restricted stock units and 1,450 shares held jointly with spouse."}],"balance_after":74459,"source":{"system":"sec-edgar","filing":"0001415889-22-001491","document":"form4-02172022_110208.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922001491/form4-02172022_110208.xml","form_type":"4"}},{"id":2452554,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 12-31-21."}],"balance_after":919,"source":{"system":"sec-edgar","filing":"0001415889-22-000121","document":"form4-01042022_100138.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922000121/form4-01042022_100138.xml","form_type":"4"}},{"id":2452553,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 12-31-21."}],"balance_after":3048,"source":{"system":"sec-edgar","filing":"0001415889-22-000121","document":"form4-01042022_100138.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588922000121/form4-01042022_100138.xml","form_type":"4"}},{"id":2550595,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 9-30-21."}],"balance_after":918,"source":{"system":"sec-edgar","filing":"0001415889-21-004738","document":"form4-10052021_101048.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588921004738/form4-10052021_101048.xml","form_type":"4"}},{"id":2550594,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 09-30-21."}],"balance_after":3034,"source":{"system":"sec-edgar","filing":"0001415889-21-004738","document":"form4-10052021_101048.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000141588921004738/form4-10052021_101048.xml","form_type":"4"}},{"id":2567011,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 06-30-21."}],"balance_after":3018,"source":{"system":"sec-edgar","filing":"0001179110-21-007241","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021007241/edgar.xml","form_type":"4"}},{"id":2762827,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":2995,"source":{"system":"sec-edgar","filing":"0001179110-21-004120","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021004120/edgar.xml","form_type":"4"}},{"id":2841634,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":"F2","text":"Included in this total are 10 shares in Mr. Pilmer's name as custodian; 34,023 shares held in a brokerage account and 32,947 shares of Restricted Stock Units."}],"balance_after":66980,"source":{"system":"sec-edgar","filing":"0001179110-21-001919","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021001919/edgar.xml","form_type":"4"}},{"id":2923919,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 12-31-20."}],"balance_after":2992,"source":{"system":"sec-edgar","filing":"0001179110-21-000115","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911021000115/edgar.xml","form_type":"4"}},{"id":3017520,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 09-30-20."}],"balance_after":2988,"source":{"system":"sec-edgar","filing":"0001179110-20-010106","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911020010106/edgar.xml","form_type":"4"}},{"id":3094077,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 06-30-20."}],"balance_after":2984,"source":{"system":"sec-edgar","filing":"0001179110-20-007836","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911020007836/edgar.xml","form_type":"4"}},{"id":3187988,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 03-31-20."}],"balance_after":2978,"source":{"system":"sec-edgar","filing":"0001179110-20-004440","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911020004440/edgar.xml","form_type":"4"}},{"id":3251008,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":"price","element":"transactionPricePerShare","label":"F3","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Included in this total are 10 shares in Mr. Pilmer's name as custodian; 27,374 shares held in brokerage and 32,839 shares of Restricted Stock Units."}],"balance_after":60223,"source":{"system":"sec-edgar","filing":"0001179110-20-001803","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911020001803/edgar.xml","form_type":"4"}},{"id":3325453,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 12-31-19."}],"balance_after":2975,"source":{"system":"sec-edgar","filing":"0001179110-20-000219","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911020000219/edgar.xml","form_type":"4"}},{"id":3402116,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 9-30-19."}],"balance_after":2972,"source":{"system":"sec-edgar","filing":"0001104659-19-052527","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000110465919052527/a4.xml","form_type":"4"}},{"id":3475426,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 6-30-19."}],"balance_after":2969,"source":{"system":"sec-edgar","filing":"0001179110-19-008231","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911019008231/edgar.xml","form_type":"4"}},{"id":3505805,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 12-31-18."}],"balance_after":2876,"source":{"system":"sec-edgar","filing":"0001179110-19-000041","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911019000041/edgar.xml","form_type":"4"}},{"id":3803390,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 9-30-18."}],"balance_after":2827,"source":{"system":"sec-edgar","filing":"0001179110-18-011918","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018011918/edgar.xml","form_type":"4"}},{"id":3803389,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 9-30-18."}],"balance_after":926,"source":{"system":"sec-edgar","filing":"0001179110-18-011918","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018011918/edgar.xml","form_type":"4"}},{"id":3877444,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 6-30-18."}],"balance_after":925,"source":{"system":"sec-edgar","filing":"0001179110-18-009330","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018009330/edgar.xml","form_type":"4"}},{"id":3877443,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 6-30-18."}],"balance_after":2776,"source":{"system":"sec-edgar","filing":"0001179110-18-009330","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018009330/edgar.xml","form_type":"4"}},{"id":3977837,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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 3-30-18."}],"balance_after":2715,"source":{"system":"sec-edgar","filing":"0001179110-18-005070","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018005070/edgar.xml","form_type":"4"}},{"id":3995600,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","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":"price","element":"transactionPricePerShare","label":"F2","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"Included in this total are 12,549 shares held in brokerage; 38,066 shares of Restricted Stock Units and 36.054 shares of Restricted Stock Equivalents."}],"balance_after":50651.054,"source":{"system":"sec-edgar","filing":"0001179110-18-002581","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018002581/edgar.xml","form_type":"4"}},{"id":4118395,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc.Common Stock","published_at":"2018-01-02T23:05:02.000Z","date":"2017-12-31","kind":"grant","acquired":true,"shares":110,"ownership":{"direct":false,"nature":"401(k) plan"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of this total, 110 shares were allocated during the fourth quarter 2017 pursuant to the Old Second Bancorp, Inc. 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Information herein was provided by the Plan Trustee as of 12-31-17."}],"balance_after":2654,"source":{"system":"sec-edgar","filing":"0001179110-18-000146","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/357173/000117911018000146/edgar.xml","form_type":"4"}},{"id":4198557,"issuer":{"id":2238,"kind":"organization","name":"OLD SECOND BANCORP INC","symbol":"OSBC"},"owners":[{"id":33494,"kind":"person","name":"Pilmer Donald","position":1,"cik":"0001673321","reported_name":"Pilmer Donald","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP"}}],"security":"Old Second Bancorp, Inc.Common Stock","published_at":"2017-10-02T20:34:26.000Z","date":"2017-09-30","kind":"grant","acquired":true,"shares":367,"ownership":{"direct":false,"nature":"401(k) plan"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Does not apply."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Of this total, 367 shares were allocated during the third quarter 2017 pursuant to the Old Second Bancorp, Inc. 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