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Income Taxes - Components of Deferred Income Tax Provision (Details) (USD $) | 0 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 01, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Components of the provision for deferred income taxes |  |  |  |
Provision for loan losses |  | $ 3,146,000 osbc_DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses | $ 5,511,000 osbc_DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses | $ 6,125,000 osbc_DeferredIncomeTaxExpenseBenefitProvisionForLoanLosses
Deferred compensation |  | 1,000 osbc_DeferredIncomeTaxExpenseBenefitDeferredCompensation | (109,000)osbc_DeferredIncomeTaxExpenseBenefitDeferredCompensation | (51,000)osbc_DeferredIncomeTaxExpenseBenefitDeferredCompensation
Amortization of core deposit intangible assets |  | (203,000)osbc_DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets | (691,000)osbc_DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets | (382,000)osbc_DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsIntangibleAssets
Stock option expense |  | (80,000)osbc_DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost | 202,000 osbc_DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost | 326,000 osbc_DeferredIncomeTaxExpenseBenefitShareBasedCompensationCost
OREO write downs |  | 1,402,000 osbc_DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns | 6,591,000 osbc_DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns | (6,538,000)osbc_DeferredIncomeTaxExpenseBenefitOtherRealEstateOwnedWriteDowns
Federal net operating loss carryforward |  | 1,022,000 osbc_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic | (7,287,000)osbc_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic | (926,000)osbc_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsDomestic
State net operating loss carryforward |  | 2,442,000 osbc_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal | (1,661,000)osbc_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal | (446,000)osbc_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwardsStateAndLocal
Deferred tax credit |  | (107,000)osbc_DeferredTaxAssetsTaxCredit |  |
Depreciation |  | (233,000)osbc_DeferredIncomeTaxExpenseBenefitDepreciation | (28,000)osbc_DeferredIncomeTaxExpenseBenefitDepreciation | (202,000)osbc_DeferredIncomeTaxExpenseBenefitDepreciation
Net premiums and discounts on securities |  | (8,000)osbc_DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet | (114,000)osbc_DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet | 85,000 osbc_DeferredIncomeTaxExpenseBenefitPremiumsAndDiscountsOnSecuritiesNet
Mortgage servicing rights |  | (251,000)osbc_DeferredIncomeTaxExpenseBenefitMortgageServicingRights | 752,000 osbc_DeferredIncomeTaxExpenseBenefitMortgageServicingRights | 281,000 osbc_DeferredIncomeTaxExpenseBenefitMortgageServicingRights
Goodwill amortization/impairment |  | 2,123,000 osbc_DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill | 1,544,000 osbc_DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill | 1,526,000 osbc_DeferredIncomeTaxExpenseBenefitGoodwillAndIntangibleAssetsGoodwill
State tax benefits |  | (1,704,000)osbc_DeferredIncomeTaxExpenseBenefitStateTaxBenefits | (321,000)osbc_DeferredIncomeTaxExpenseBenefitStateTaxBenefits | 114,000 osbc_DeferredIncomeTaxExpenseBenefitStateTaxBenefits
Change in valuation allowance |  | (2,363,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (74,145,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 738,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other, net |  | 446,000 osbc_DeferredIncomeTaxExpenseBenefitOther | (620,000)osbc_DeferredIncomeTaxExpenseBenefitOther | (650,000)osbc_DeferredIncomeTaxExpenseBenefitOther
Total deferred tax benefit |  | 5,633,000 us-gaap_DeferredIncomeTaxExpenseBenefit | (70,376,000)us-gaap_DeferredIncomeTaxExpenseBenefit |
Valuation allowance on deferred tax assets |  |  | 2,363,000 us-gaap_DeferredTaxAssetsValuationAllowance |
Difference between effective tax rates and federal statutory rates applied to financial statement income |  |  |  |
Tax at statutory federal income tax rate |  | 5,564,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 4,145,000 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | (25,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Nontaxable interest income, net of disallowed interest deduction |  | (233,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (245,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (192,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome
BOLI income |  | (508,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | (694,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance | (563,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
State income taxes, net of federal benefit |  | 872,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 662,000 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (53,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Change in valuation allowance |  | (2,363,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (74,145,000)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 738,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Deficiency from restricted stock |  |  | 10,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost | 299,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Impact of Illinois tax rate change |  | 2,363,000 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate |  |
Other, net |  | 66,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 25,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | (204,000)us-gaap_IncomeTaxReconciliationOtherAdjustments
Provision (benefit) for income taxes |  | 5,761,000 us-gaap_IncomeTaxExpenseBenefit | (70,242,000)us-gaap_IncomeTaxExpenseBenefit |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | 15,897,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 11,843,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | (72,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current income tax expense |  | 128,000 us-gaap_CurrentIncomeTaxExpenseBenefit |  |
Deferred income tax expense offset by reversal of deferred tax valuation allowance reserve |  | 8,000,000 osbc_DeferredIncomeTaxExpenseBenefitOffsetByReversalOfDeferredTaxValuationAllowanceReserve |  |
Reversal of deferred tax valuation allowance reserve |  | $ 2,400,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |
Illinois corporate tax rates (as a percent) | 7.75%osbc_IllinoisCorporateTaxRate | 9.50%osbc_IllinoisCorporateTaxRate |  |

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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to deferred compensation. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to depreciation. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to goodwill. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to mortgage servicing rights. + References No definition available. + Details
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- Definition Amount of deferred income tax expense (benefit) offset by reversal of deferred tax valuation allowance reserve pertaining to income (loss) from continuing operations. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to deductible domestic operating loss carryforwards, excluding state and local operating loss carryforwards. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) not separately disclosed. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to wrote downs on other real estate owned. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to net premiums and discounts on securities. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to provision for loan losses. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to share based compensation. + References No definition available. + Details
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- Definition The component of income tax expense for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to state tax benefits. + References No definition available. + Details
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- Definition The component of deferred income tax expense (benefit) for the period representing the increase (decrease) in the entity's deferred income tax expense (benefit) pertaining to deferred tax credits. + References No definition available. + Details
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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6510177 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + 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.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + 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.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32059-109318 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible life insurance expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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