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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
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Balance at Dec. 31, 2011 | $ 18,628 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 70,863 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 65,999 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 17,107 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (3,702)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (94,893)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 74,002 us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  | (72)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (72)us-gaap_NetIncomeLoss
Other comprehensive loss, net of tax |  |  |  |  | 2,375 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 2,375 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in restricted stock | 101 us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (101)us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Stock based compensation |  |  | 291 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 291 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Purchase of treasury stock |  |  |  |  |  | (63)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (63)us-gaap_TreasuryStockValueAcquiredCostMethod
Preferred stock accretion and declared dividends |  | 1,006 osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | (4,987)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (3,981)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact
Balance at Dec. 31, 2012 | 18,729 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 71,869 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 66,189 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 12,048 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,327)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (94,956)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 72,552 us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  | 82,085 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 82,085 us-gaap_NetIncomeLoss
Other comprehensive loss, net of tax |  |  |  |  | (5,711)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (5,711)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in restricted stock | 101 us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (101)us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Recapture of restricted stock |  |  | (43)osbc_RecaptureOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | (569)osbc_RecaptureOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (612)osbc_RecaptureOfRestrictedStock
Stock based compensation |  |  | 167 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 167 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Purchase of treasury stock |  |  |  |  |  | (278)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (278)us-gaap_TreasuryStockValueAcquiredCostMethod
Preferred stock accretion and declared dividends |  | 1,073 osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | (1,584)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (511)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact
Balance at Dec. 31, 2013 | 18,830 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 72,942 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 66,212 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 92,549 us-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 | 147,692 us-gaap_StockholdersEquity
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net income |  |  |  | 10,136 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | 10,136 us-gaap_NetIncomeLoss
Other comprehensive loss, net of tax |  |  |  |  | (675)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (675)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Change in restricted stock | 10 us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | (10)us-gaap_RestrictedStockExpense / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |
Tax effect from vesting of restricted stock |  |  | 29 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 29 us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet
Stock based compensation |  |  | 295 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 295 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Purchase of treasury stock |  |  |  |  |  | (46)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | (46)us-gaap_TreasuryStockValueAcquiredCostMethod
Redemption of preferred stock |  | (25,669)us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | 1,348 us-gaap_StockRedeemedOrCalledDuringPeriodValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (24,321)us-gaap_StockRedeemedOrCalledDuringPeriodValue
Common stock offering | 15,525 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 48,806 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  | 64,331 us-gaap_StockIssuedDuringPeriodValueNewIssues
Preferred stock accretion and declared dividends |  | 58 osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember |  | (3,336)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |  | (3,278)osbc_PreferredStockDividendsAndOtherAdjustmentsEquityImpact
Balance at Dec. 31, 2014 | $ 34,365 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 47,331 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 115,332 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 100,697 us-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 | $ 194,163 us-gaap_StockholdersEquity

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- Definition This element represents the amount of recognized equity-based compensation during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). Alternate captions include the words "stock-based compensation". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415241&loc=d3e4534-113899 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11149-113907 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11178-113907 + Details
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