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Earnings Per Share - Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended | 0 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2014 | Dec. 30, 2014 | Apr. 28, 2014 | Mar. 31, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Redemption of stock |  |  |  |  |  |
Net proceeds from sale of common stock | $ 64.0 us-gaap_SaleOfStockConsiderationReceivedOnTransaction |  |  |  |  |
Preferred stock, Shares outstanding |  |  |  | 31,553 us-gaap_PreferredStockSharesOutstanding |  | 47,331 us-gaap_PreferredStockSharesOutstanding
Series B Stock |  |  |  |  |  |
Redemption of stock |  |  |  |  |  |
Shares redeemed (in shares) |  |  | 25,669 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 15,778 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 25,669 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Repurchase price percentage of liquidation value (as a percent) |  |  | 94.75%osbc_PreferredStockRepurchasePricePercentageOfLiquidationValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 94.75%osbc_PreferredStockRepurchasePricePercentageOfLiquidationValue / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Shares to be redeemed, percent of issued and outstanding |  | 33.33%osbc_StockRedeemedOrCalledDuringPeriodPercentageOfIssuedAndOutstandingShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 33.33%osbc_StockRedeemedOrCalledDuringPeriodPercentageOfIssuedAndOutstandingShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |
Preferred Stock, Redemption Price Per Share |  | $ 1,000 us-gaap_PreferredStockRedemptionPricePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  |  |  |
Preferred stock, Shares outstanding |  | 47,331 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 31,553 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |  | 47,331 us-gaap_PreferredStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember
Common |  |  |  |  |  |
Redemption of stock |  |  |  |  |  |
Shares issued | 15,525,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |  |
Net proceeds from sale of common stock | $ 64.0 us-gaap_SaleOfStockConsiderationReceivedOnTransaction / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |  |

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- Definition The price per share at which the preferred stock of an entity that has priority over common stock in the distribution of dividends and in the event of liquidation of the entity is redeemed or may be called at. The redemption features of this preferred stock are solely within the control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 + Details
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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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