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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements of Comprehensive Income
Net income	$ 3,499us-gaap_NetIncomeLoss	$ 2,202us-gaap_NetIncomeLoss
Unrealized holding gains (losses) on available-for-sale securities arising during the period	921us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	(1,089)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Related tax (expense) benefit	(438)osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent	448osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent
Holding gains (losses) after tax on available-for-sale securities	483us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(641)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: Reclassification adjustment for the net gains realized during the period
Net realized losses	(109)osbc_OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	(69)osbc_OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Income tax benefit on net realized gains	45osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent	28osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent
Net realized losses after tax	64osbc_OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent	41osbc_OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent
Other comprehensive income (loss) on available-for-sale securities	547osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax	(600)osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax
Accretion of net unrealized holding gains on held-to-maturity transferred from available-for-sale securities	243us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax	247us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax
Related tax expense	(100)osbc_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax	(102)osbc_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax
Other comprehensive income on held-to-maturity securities	143us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax	145us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax
Total other comprehensive income (loss)	690us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	(455)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Total comprehensive income	$ 4,189us-gaap_ComprehensiveIncomeNetOfTax	$ 1,747us-gaap_ComprehensiveIncomeNetOfTax

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Tax effect of the realized gain or the realized loss, net of reclassification adjustment, in the change in value of available for sale securities during the period that is attributable to the parent entity.

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