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Income Taxes - Carryforwards (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Components of deferred tax assets and liabilities |  |
Deferred Tax assets related to net unrealized losses on held-to-maturity securities transferred from available-for-sale securities | $ 2.8 osbc_DeferredTaxAssetsNetUnrealizedLossesOnHeldToMaturitySecuritiesTransferredFromAvailableForSaleSecurities | $ 3.2 osbc_DeferredTaxAssetsNetUnrealizedLossesOnHeldToMaturitySecuritiesTransferredFromAvailableForSaleSecurities
Alternative minimum tax credit |  |
Net operating loss carryforward |  |
Alternative minimum tax credit that can be carried forward | 1.6 us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = osbc_AlternativeMinimumMember |
Federal |  |
Net operating loss carryforward |  |
Net operating loss carryforward | 77.1 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |
Federal | 2030 |  |
Net operating loss carryforward |  |
Net operating loss carryforward | 21.8 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxPeriodAxis = osbc_ExpirationYear2030Member |
Federal | 2031 |  |
Net operating loss carryforward |  |
Net operating loss carryforward | 31.4 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxPeriodAxis = osbc_ExpirationYear2031Member |
Federal | 2032 |  |
Net operating loss carryforward |  |
Net operating loss carryforward | 8.6 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxPeriodAxis = osbc_ExpirationYear2032Member |
Federal | 2033 |  |
Net operating loss carryforward |  |
Net operating loss carryforward | 15.3 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_TaxPeriodAxis = osbc_ExpirationYear2033Member |
State |  |
Net operating loss carryforward |  |
Net operating loss carryforward | 121.4 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |
State | 2021 |  |
Net operating loss carryforward |  |
Net operating loss carryforward | 25.7 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxPeriodAxis = osbc_ExpirationYear2021Member |
State | 2025 |  |
Net operating loss carryforward |  |
Net operating loss carryforward | $ 95.7 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember / us-gaap_TaxPeriodAxis = osbc_ExpirationYear2025Member |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the tax effect on net unrealized losses on held-to-maturity securities transferred from available-for-sale securities. + References No definition available. + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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