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Fair Value Measurements - Nonrecurring (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Assets and liabilities measured at fair value |  |  |  |
Valuation allowance | $ 278,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance | $ 2,395,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance |  |
Carrying value of other real estate owned | 31,982,000 us-gaap_RealEstateAcquiredThroughForeclosure | 41,537,000 us-gaap_RealEstateAcquiredThroughForeclosure | 72,423,000 us-gaap_RealEstateAcquiredThroughForeclosure | 93,290,000 us-gaap_RealEstateAcquiredThroughForeclosure
OREO Valuation allowance | 19,229,000 us-gaap_RealEstateOwnedValuationAllowance | 22,284,000 us-gaap_RealEstateOwnedValuationAllowance | 31,454,000 us-gaap_RealEstateOwnedValuationAllowance | 23,462,000 us-gaap_RealEstateOwnedValuationAllowance
OREO charge to expense | 4,559,000 us-gaap_RealEstateOwnedValuationAllowanceProvision1 | 8,293,000 us-gaap_RealEstateOwnedValuationAllowanceProvision1 | 16,385,000 us-gaap_RealEstateOwnedValuationAllowanceProvision1 |
Nonrecurring | Impaired loans |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Valuation allowance | 278,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 2,400,000 us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Decrease of specific allocations within the provision for loan losses | 2,100,000 osbc_ImpairedFinancingReceivableDecreaseOfSpecificAllocationsWithinProvisionForLoanLosses / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 3,900,000 osbc_ImpairedFinancingReceivableDecreaseOfSpecificAllocationsWithinProvisionForLoanLosses / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Nonrecurring | Impaired loans | Carrying Amount |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Total | 842,000,000,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 11,500,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Nonrecurring | Other real estate owned |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Carrying value of other real estate owned | 32,000,000 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 41,500,000 us-gaap_RealEstateAcquiredThroughForeclosure / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Outstanding balance | 53,000,000 osbc_RealEstateGross / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 65,900,000 osbc_RealEstateGross / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
OREO Valuation allowance | 19,200,000 us-gaap_RealEstateOwnedValuationAllowance / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 22,300,000 us-gaap_RealEstateOwnedValuationAllowance / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
OREO participations | 1,800,000 osbc_RealEstateOwnedParticipations / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 2,100,000 osbc_RealEstateOwnedParticipations / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Nonrecurring | Level 3 |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Total | 32,546,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 50,640,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Nonrecurring | Level 3 | Impaired loans |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Total | 564,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 9,103,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Nonrecurring | Level 3 | Other real estate owned |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Total | 31,982,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 41,537,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Nonrecurring | Total |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Total | 32,546,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 50,640,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Nonrecurring | Total | Impaired loans |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Total | 564,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | 9,103,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_ImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |
Nonrecurring | Total | Other real estate owned |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Total | $ 31,982,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | $ 41,537,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = osbc_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember |  |

X
- Definition Represents the amount of increase (decrease) in specific allocations within the provision for loan losses for impaired financing receivables. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 28 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule III -Article 5 + Details
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- Definition For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Subparagraph 4 -Article 9 + Details
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- Definition Amount of expense recognized in the income statement for a decrease in valuation of real estate owned (REO). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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