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Securities - Realized Gain (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Securities |  |  |
Proceeds from sales of securities | $ 296,013 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | $ 533,302 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities | $ 223,860 us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Gross realized gains on securities | 3,231 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 5,376 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains | 1,937 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses on securities | (1,512)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (7,288)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses | (362)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Securities (losses) gains, net | 1,719 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | (1,912)us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | 1,575 us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
Income tax (expense) benefit on net realized gains (losses) | $ 704 osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent | $ (784)osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent | $ 641 osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent

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- Definition Tax effect of the realized gain or the realized loss, net of reclassification adjustment, in the change in value of available for sale securities during the period that is attributable to the parent entity. + References No definition available. + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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