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Series B Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2009 | Mar. 31, 2015
Preferred Stock |  |
Proceeds from the Treasury | $ 73 us-gaap_ProceedsFromIssuanceOfPreferredStockPreferenceStockAndWarrants |
Series B Stock |  |
Preferred Stock |  |
Period for payment of cumulative dividends using the initial cumulative dividend rate |  | 5 years
Cumulative dividends, initial rate for the first five years (as a percent) |  | 5.00%osbc_PreferredStockDividendRatePercentageForFirstFiveYears / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Cumulative dividends rate (as a percent) |  | 9.00%osbc_PreferredStockDividendRatePercentageAfterFirstFiveYears / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Fair value | 68.2 us-gaap_EquityFairValueDisclosure / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Warrants |  |
Preferred Stock |  |
Warrants, term |  | 10 years
Warrants to purchase the Company's common stock, initially authorized (in shares) |  | 815,339 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember
Warrants, exercise price (in dollars per share) |  | 13.43 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember
Fair value | $ 4.8 us-gaap_EquityFairValueDisclosure / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Fair value of the entity's equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholder, which takes precedence over common stockholders in the event of liquidation and from issuance of rights to purchase common shares at a predetermined price. + References No definition available. + Details
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