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

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