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Parent Company Condensed Financial Information -Condensed Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows from Operating Activities |  |  |
Net income | $ 10,136 us-gaap_NetIncomeLoss | $ 82,085 us-gaap_NetIncomeLoss | $ (72)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |
Deferred income taxes | 5,563 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | (70,376)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes |
Change in taxes payable | 86 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (132)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 815 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Gain on recapture of restricted stock |  | (612)osbc_GainOnRecaptureOfRestrictedStock |
Stock-based compensation | 295 us-gaap_ShareBasedCompensation | 167 us-gaap_ShareBasedCompensation | 291 us-gaap_ShareBasedCompensation
Net cash (used in) provided by operating activities | (6,307)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 35,256 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 43,303 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Financing Activities |  |  |
Dividends paid | (12,390)us-gaap_PaymentsOfDividends |  |
Purchases of treasury stock | (46)us-gaap_PaymentsForRepurchaseOfCommonStock | (278)us-gaap_PaymentsForRepurchaseOfCommonStock | (63)us-gaap_PaymentsForRepurchaseOfCommonStock
Proceeds from issuance of common stock | 64,331 us-gaap_SaleOfStockConsiderationReceivedOnTransaction |  |
Redemption of preferred stock | (24,321)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock |  |
Net cash provided by (used in) financing activities | 68,977 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | (125,684)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 93,349 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net change in cash and cash equivalents | (3,463)us-gaap_NetCashProvidedByUsedInContinuingOperations | (80,847)us-gaap_NetCashProvidedByUsedInContinuingOperations | 77,558 us-gaap_NetCashProvidedByUsedInContinuingOperations
Cash and cash equivalents at beginning of period | 47,660 us-gaap_CashCashEquivalentsAndFederalFundsSold | 128,507 us-gaap_CashCashEquivalentsAndFederalFundsSold | 50,949 us-gaap_CashCashEquivalentsAndFederalFundsSold
Cash and cash equivalents at end of period | 44,197 us-gaap_CashCashEquivalentsAndFederalFundsSold | 47,660 us-gaap_CashCashEquivalentsAndFederalFundsSold | 128,507 us-gaap_CashCashEquivalentsAndFederalFundsSold
Old Second Bancorp, Inc. |  |  |
Cash Flows from Operating Activities |  |  |
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
Adjustments to reconcile net income (loss) to net cash from operating activities: |  |  |
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
Deferred income taxes | (2,256)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (16,786)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Change in taxes payable | 22 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 14 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,445 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Change in other assets | 740 us-gaap_IncreaseDecreaseInOtherCurrentAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (264)us-gaap_IncreaseDecreaseInOtherCurrentAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (100)us-gaap_IncreaseDecreaseInOtherCurrentAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Gain on recapture of restricted stock |  | (612)osbc_GainOnRecaptureOfRestrictedStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Stock-based compensation | 295 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 167 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 291 us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other, net | (17,151)us-gaap_OtherOperatingActivitiesCashFlowStatement / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,502 us-gaap_OtherOperatingActivitiesCashFlowStatement / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,293 us-gaap_OtherOperatingActivitiesCashFlowStatement / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash (used in) provided by operating activities | (22,586)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,205)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (698)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Financing Activities |  |  |
Dividends paid | (12,390)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Purchases of treasury stock | (46)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (278)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (63)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from issuance of common stock | 64,331 us-gaap_SaleOfStockConsiderationReceivedOnTransaction / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Redemption of preferred stock | (24,321)us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net cash provided by (used in) financing activities | 27,574 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (278)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (63)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in cash and cash equivalents | 4,988 us-gaap_NetCashProvidedByUsedInContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,483)us-gaap_NetCashProvidedByUsedInContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (761)us-gaap_NetCashProvidedByUsedInContinuingOperations / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at beginning of period | 2,071 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,554 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,315 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash and cash equivalents at end of period | $ 7,059 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 2,071 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 3,554 us-gaap_CashCashEquivalentsAndFederalFundsSold / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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