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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Consolidated Statements of Comprehensive Income (Loss) |  |  |
Net income | $ 10,136 us-gaap_NetIncomeLoss | $ 82,085 us-gaap_NetIncomeLoss | $ (72)us-gaap_NetIncomeLoss
Unrealized holding (losses) gains on available-for-sale securities arising during the period | (394)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (11,965)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | 5,614 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Related tax benefit (expense) | 165 osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent | 4,924 osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent | (2,305)osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetUnrealizedGainsAttributableToParent
Holding (losses) gains after tax on available-for-sale securities | (229)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | (7,041)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | 3,309 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Less: Reclassification adjustment for the net gains realized during the period |  |  |
Net realized gains (losses) | 1,719 osbc_OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | (1,912)osbc_OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax | 1,575 osbc_OtherComprehensiveIncomeRealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Income tax (expense) benefit on net realized gains (losses) | (704)osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent | 784 osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent | (641)osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesTaxPortionOnNetRealizedGainsAttributableToParent
Net realized gains (losses) after tax | (1,015)osbc_OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent | 1,128 osbc_OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent | (934)osbc_OtherComprehensiveIncomeLossNetOfTaxPortionOfRealizedGainsAttributableToParent
Other comprehensive loss on available-for-sale securities | (1,244)osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax | (5,913)osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax | 2,375 osbc_OtherComprehensiveIncomeAvailableForSaleSecuritiesUnrealizedHoldingGainLossNetReclassificationAdjustmentForAmountsRealizedAfterTax
Accretion of net unrealized holding losses on held-to-maturity transferred from available-for-sale securities | 968 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax | 343 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForHeldToMaturityTransferredToAvailableForSaleSecuritiesBeforeTax |
Related tax expense | (399)osbc_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax | (141)osbc_OtherComprehensiveIncomeReclassificationAdjustmentForAvailableForSaleTransferredToHeldToMaturitySecuritiesTax |
Other comprehensive income on held-to-maturity securities | 569 us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax | 202 us-gaap_OtherComprehensiveIncomeLossTransfersFromHeldToMaturityToAvailableForSaleSecuritiesNetOfTax |
Total other comprehensive loss | (675)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | (5,711)us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent | 2,375 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent
Total comprehensive income | $ 9,461 us-gaap_ComprehensiveIncomeNetOfTax | $ 76,374 us-gaap_ComprehensiveIncomeNetOfTax | $ 2,303 us-gaap_ComprehensiveIncomeNetOfTax

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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