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Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Common Stock	Preferred Stock	Additional Paid In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance at Dec. 31, 2013	$ 18,830us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 72,942us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember	$ 66,212us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ 92,549us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ (7,038)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (95,803)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ 147,692us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity
Net income				2,202us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember			2,202us-gaap_NetIncomeLoss
Other comprehensive gain (loss), net of tax					(455)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember		(455)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in restricted stock	10us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		(10)us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Recapture of restricted stock			29osbc_RecaptureOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember				29osbc_RecaptureOfRestrictedStock
Stock based compensation			66us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember				66us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Purchase of treasury stock						(46)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	(46)us-gaap_TreasuryStockValueAcquiredCostMethod
Preferred stock accretion and declared dividends		58osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember		(58)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Balance at Mar. 31, 2014	18,840us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	73,000us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember	66,297us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	94,693us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(7,493)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(95,849)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	149,488us-gaap_StockholdersEquity
Balance at Dec. 31, 2014	34,365us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	47,331us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember	115,332us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	100,697us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	(7,713)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	(95,849)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	194,163us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity
Net income				3,499us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember			3,499us-gaap_NetIncomeLoss
Other comprehensive gain (loss), net of tax					690us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember		690us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in restricted stock	50us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember		(50)us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Tax effect from vesting of restricted stock			30us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember				30us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Stock based compensation			177us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember				177us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Purchase of treasury stock						(117)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	(117)us-gaap_TreasuryStockValueAcquiredCostMethod
Redemption of preferred stock		(15,778)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember					(15,778)us-gaap_StockRedeemedOrCalledDuringPeriodValue
Preferred stock accretion and declared dividends				(824)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember			(824)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact
Balance at Mar. 31, 2015	$ 34,415us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember	$ 31,553us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember	$ 115,489us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember	$ 103,372us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ (7,023)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember	$ (95,966)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember	$ 181,840us-gaap_StockholdersEquity

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- Definition

The increase (decrease) in components of stockholders equity related to the aggregate value of preferred stock dividends and other adjustments.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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