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Earnings Per Share - Preferred Stock (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 3 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2014 | Apr. 28, 2014 | Jun. 30, 2014 | Apr. 30, 2014
Redemption of stock |  |  |  |
Net proceeds from sale of common stock | $ 64,331 us-gaap_SaleOfStockConsiderationReceivedOnTransaction |  |  |
Benefit from redemptions at below liquidation value | 1,348 us-gaap_PreferredStockRedemptionDiscount |  |  |
Benefit from reversal of dividends previously accrued or accumulated and waived by holders upon redemption | 5,433 osbc_RedeemablePreferredStockDividendsWaivedUponTemporaryEquityRedemption |  |  |
Series B Stock |  |  |  |
Redemption of stock |  |  |  |
Shares redeemed (in shares) |  | 25,669 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 25,669 us-gaap_StockRedeemedOrCalledDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember |
Net proceeds from sale of common stock |  |  | 64,000 us-gaap_SaleOfStockConsiderationReceivedOnTransaction / 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 |
Benefit from reversal of dividends previously accrued or accumulated and waived by holders upon redemption |  |  | 5,400 osbc_RedeemablePreferredStockDividendsWaivedUponTemporaryEquityRedemption / 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 |  |  | $ 64,000 us-gaap_SaleOfStockConsiderationReceivedOnTransaction / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |

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- Definition Represents the amount of dividends payable to preferred stock holders waived upon redemption of temporary equity. + References No definition available. + Details
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- Definition The excess of (1) the carrying amount of the preferred stock in the registrant's balance sheet over (2) the fair value of the consideration transferred to the holders of the preferred stock, during the accounting period, which will be added to net earnings to arrive at net earnings available to common shareholders in the calculation of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section S99 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27010884&loc=d3e42851-122695 + Details
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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
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- Definition Number of new stock issued during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + 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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