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Income Taxes - Components (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Components of income tax expense (benefit) |  |  |
Current federal | $ 122 us-gaap_CurrentFederalTaxExpenseBenefit | $ 105 us-gaap_CurrentFederalTaxExpenseBenefit |
Current state | 6 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 29 us-gaap_CurrentStateAndLocalTaxExpenseBenefit |
Deferred federal | 3,120 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 2,780 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (302)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred state | 4,876 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 989 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (436)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Change in valuation allowance | (2,363)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (74,145)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 738 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Provision (benefit) for income taxes | 5,761 us-gaap_IncomeTaxExpenseBenefit | (70,242)us-gaap_IncomeTaxExpenseBenefit |
Deferred tax assets |  |  |
Allowance for loan losses | 9,579 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | 12,725 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses |
Deferred compensation | 787 osbc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation | 788 osbc_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsDeferredCompensation |
Amortization of core deposit | 1,859 osbc_DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets | 1,656 osbc_DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets |
Goodwill amortization/impairment | 13,129 osbc_DeferredTaxAssetsGoodwillAndIntangibleAssetsGoodwill | 15,252 osbc_DeferredTaxAssetsGoodwillAndIntangibleAssetsGoodwill |
Stock option expense | 663 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 583 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |
OREO write downs | 8,639 osbc_DeferredTaxAssetsOtherRealEstateOwnedWriteDowns | 10,041 osbc_DeferredTaxAssetsOtherRealEstateOwnedWriteDowns |
Federal net operating loss ("NOL") carryforward | 27,001 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | 28,023 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic |
State net operating loss ("NOL") carryforward | 9,405 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 11,847 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal |
Deferred tax credit | 1,551 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 1,444 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards |
Other assets | 1,006 us-gaap_DeferredTaxAssetsOther | 1,166 us-gaap_DeferredTaxAssetsOther |
Total deferred tax assets | 73,619 us-gaap_DeferredTaxAssetsGross | 83,525 us-gaap_DeferredTaxAssetsGross |
Deferred tax liabilities |  |  |
Accumulated depreciation on premises and equipment | (802)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (1,035)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment |
Accretion on securities |  | (8)osbc_DeferredTaxLiabilitiesAccretionOnSecurities |
Mortgage servicing rights | (2,320)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights | (2,571)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights |
State tax benefits | (5,290)osbc_DeferredTaxLiabilitiesStateTaxBenefits | (6,994)osbc_DeferredTaxLiabilitiesStateTaxBenefits |
Other liabilities | (394)us-gaap_DeferredTaxLiabilitiesOther | (178)us-gaap_DeferredTaxLiabilitiesOther |
Total deferred tax liabilities | (8,806)us-gaap_DeferredIncomeTaxLiabilities | (10,786)us-gaap_DeferredIncomeTaxLiabilities |
Net deferred tax asset before valuation allowance | 64,813 osbc_DeferredTaxAssetsLiabilitiesGross | 72,739 osbc_DeferredTaxAssetsLiabilitiesGross |
Tax effect of net unrealized loss on investments | 5,328 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 4,927 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross |
Valuation Allowance |  | (2,363)us-gaap_DeferredTaxAssetsValuationAllowance |
Net deferred tax asset | 70,141 us-gaap_DeferredTaxAssetsLiabilitiesNet | 75,303 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Old Second Bancorp, Inc. |  |  |
Components of income tax expense (benefit) |  |  |
Provision (benefit) for income taxes | $ (2,305)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ (17,133)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |

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