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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	$ 73us-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	68.2us-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)		815,339us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember
Warrants, exercise price (in dollars per share)		13.43us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember
Fair value	$ 4.8us-gaap_EquityFairValueDisclosure / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember

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- Definition

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+ References

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- Definition

The percentage of cumulative dividends on the liquidation preference amount of preferred stock after the first five years.

+ References

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- Definition

The percentage of cumulative dividends on the liquidation preference amount of preferred stock for the first five years.

+ References

No definition available.

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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

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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

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Fair value of the entity's equity.

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-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

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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.

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