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Earnings Per Share - Reconciliation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Basic earnings per share:
Weighted-average common shares outstanding	29,470,297us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	13,921,023us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted-average common shares less stock based awards	29,470,297osbc_WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards	13,912,523osbc_WeightedAverageNumberOfSharesOutstandingExcludingShareBasedPaymentAwards
Weighted-average common shares stock based awards		169,111osbc_WeightedAverageNumberOfShareBasedPaymentAwards
Net income	$ 3,499us-gaap_NetIncomeLoss	$ 2,202us-gaap_NetIncomeLoss
Preferred stock dividends and accretion	824osbc_PreferredStockDividendsAccretionOfDiscountAndDividendsWaivedUponRedemption	1,572osbc_PreferredStockDividendsAccretionOfDiscountAndDividendsWaivedUponRedemption
Net income available to common stockholders	2,675us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	630us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Basic earnings per share common undistributed earnings (loss) (in dollars per share)		$ 0.04us-gaap_EarningsPerShareBasicUndistributed
Basic earnings per share (in dollars per share)	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic
Diluted earnings per share:
Weighted-average common shares outstanding	29,470,297us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	13,921,023us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted average common shares outstanding	29,673,880us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	14,081,634us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net earnings available to common stockholders	$ 2,675us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted	$ 630us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Diluted earnings per share (in dollars per share)	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.04us-gaap_EarningsPerShareDiluted
Antidilutive options and warrants
Diluted earnings per share:
Number of antidilutive options and warrants excluded from the diluted earnings per share calculation (in shares)	1,044,339us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = osbc_StockOptionsAndWarrantsMember	1,140,839us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = osbc_StockOptionsAndWarrantsMember
Warrants
Diluted earnings per share:
Number of antidilutive options and warrants excluded from the diluted earnings per share calculation (in shares)	815,339us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember	815,339us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember
Restricted stock and restricted stock units
Diluted earnings per share:
Dilutive effect of nonvested restricted awards (in shares)	203,583us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = osbc_RestrictedStockAndRestrictedStockUnitsMember	160,611us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements / us-gaap_AwardTypeAxis = osbc_RestrictedStockAndRestrictedStockUnitsMember

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