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Parent Company Condensed Financial Information - Condensed Statements of Operations (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating Expenses |  |  |
Junior subordinated debentures interest expense | $ 4,919 us-gaap_InterestExpenseJuniorSubordinatedDebentures | $ 5,298 us-gaap_InterestExpenseJuniorSubordinatedDebentures | $ 4,925 us-gaap_InterestExpenseJuniorSubordinatedDebentures
Subordinated debt interest expense | 792 us-gaap_InterestExpenseSubordinatedNotesAndDebentures | 811 us-gaap_InterestExpenseSubordinatedNotesAndDebentures | 903 us-gaap_InterestExpenseSubordinatedNotesAndDebentures
Income before income taxes | 15,897 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 11,843 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (72)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefit | 5,761 us-gaap_IncomeTaxExpenseBenefit | (70,242)us-gaap_IncomeTaxExpenseBenefit |
Net income | 10,136 us-gaap_NetIncomeLoss | 82,085 us-gaap_NetIncomeLoss | (72)us-gaap_NetIncomeLoss
Dividends waived upon preferred stock redemption | (5,433)osbc_RedeemablePreferredStockDividendsWaivedUponTemporaryEquityRedemption |  |
Gain on preferred stock redemption | (1,348)us-gaap_PreferredStockRedemptionDiscount |  |
Net income available to common stockholders | 11,855 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 76,827 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (5,059)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Old Second Bancorp, Inc. |  |  |
Operating Income |  |  |
Other income | 231 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 772 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 189 us-gaap_OtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating income | 231 osbc_OperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 772 osbc_OperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 189 osbc_OperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Expenses |  |  |
Junior subordinated debentures interest expense | 4,919 us-gaap_InterestExpenseJuniorSubordinatedDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,298 us-gaap_InterestExpenseJuniorSubordinatedDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,925 us-gaap_InterestExpenseJuniorSubordinatedDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Subordinated debt interest expense | 792 us-gaap_InterestExpenseSubordinatedNotesAndDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 811 us-gaap_InterestExpenseSubordinatedNotesAndDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 903 us-gaap_InterestExpenseSubordinatedNotesAndDebentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other interest expense | 16 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 16 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17 us-gaap_InterestExpenseOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other expenses | 1,045 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,006 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 971 us-gaap_OtherCostAndExpenseOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating expense | 6,772 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,131 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,816 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income taxes | (6,541)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,359)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,627)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit | (2,305)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (17,133)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Income (loss) before equity in undistributed net income of subsidiaries | (4,236)osbc_IncomeLossFromContinuingOperationsAfterIncomeTaxesBeforeMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,774 osbc_IncomeLossFromContinuingOperationsAfterIncomeTaxesBeforeMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (6,627)osbc_IncomeLossFromContinuingOperationsAfterIncomeTaxesBeforeMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed net income of subsidiaries | 14,372 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 71,311 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6,555 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | 10,136 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 82,085 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (72)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Preferred stock dividends and accretion of discount | 5,062 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,258 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,987 us-gaap_PreferredStockDividendsAndOtherAdjustments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Dividends waived upon preferred stock redemption | (5,433)osbc_RedeemablePreferredStockDividendsWaivedUponTemporaryEquityRedemption / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Gain on preferred stock redemption | (1,348)us-gaap_PreferredStockRedemptionDiscount / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net income available to common stockholders | $ 11,855 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 76,827 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ (5,059)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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