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v2.4.1.9

Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2009 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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 | $ 13.43 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember | $ 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 The percentage of cumulative dividends on the liquidation preference amount of preferred stock after the first five years. + References No definition available. + Details
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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 Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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