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Other Real Estate Owned (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Activity in the other real estate owned (OREO) portfolio, net of valuation reserve |  |
Balance at beginning of period | $ 31,982 us-gaap_RealEstateAcquiredThroughForeclosure | $ 41,537 us-gaap_RealEstateAcquiredThroughForeclosure
Property additions | 6,108 us-gaap_RealEstateAcquisitionsThroughForeclosures | 4,688 us-gaap_RealEstateAcquisitionsThroughForeclosures
Less: Property disposals, net of gains/losses | 2,020 osbc_RealEstateCostOfRealEstateSoldNetOfGainLoss | 5,569 osbc_RealEstateCostOfRealEstateSoldNetOfGainLoss
Less: Period valuation adjustments | 609 osbc_RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment | 436 osbc_RealEstateOwnedValuationAllowanceProvisionNetOfAdjustment
Balance at end of period | 35,461 us-gaap_RealEstateAcquiredThroughForeclosure | 40,220 us-gaap_RealEstateAcquiredThroughForeclosure
Activity in the valuation allowance |  |
Balance at beginning of period | 19,229 us-gaap_RealEstateOwnedValuationAllowance | 22,284 us-gaap_RealEstateOwnedValuationAllowance
Provision for unrealized losses | 609 us-gaap_RealEstateOwnedValuationAllowanceProvision1 | 436 us-gaap_RealEstateOwnedValuationAllowanceProvision1
Reductions taken on sales | (382)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied | (2,647)us-gaap_RealEstateOwnedValuationAllowanceAmountsApplied
Other adjustments |  | (589)us-gaap_RealEstateOtherDeductions
Balance at end of period | 19,456 us-gaap_RealEstateOwnedValuationAllowance | 19,484 us-gaap_RealEstateOwnedValuationAllowance
Expenses related to foreclosed assets, net of lease revenue |  |
Gain on sales, net | (95)osbc_GainsLossesOnSalesOfOtherRealEstateBeforeProvisionForValuationAllowanc | (386)osbc_GainsLossesOnSalesOfOtherRealEstateBeforeProvisionForValuationAllowanc
Provision for unrealized losses | 609 us-gaap_RealEstateOwnedValuationAllowanceProvision1 | 436 us-gaap_RealEstateOwnedValuationAllowanceProvision1
Operating expenses | 1,001 osbc_RealEstateAcquiredThroughForeclosureOperatingExpenses | 1,237 osbc_RealEstateAcquiredThroughForeclosureOperatingExpenses
Less: Lease revenue | 163 us-gaap_OtherRealEstateRevenue | 279 us-gaap_OtherRealEstateRevenue
Expenses related to OREO, net of lease revenue | $ 1,352 osbc_ForeclosedRealEstateExpenseNetOfLeaseRevenue | $ 1,008 osbc_ForeclosedRealEstateExpenseNetOfLeaseRevenue

X
- Definition Amount of expense recognized during the period for real estate assets acquired through foreclosure, net of lease revenue. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The net gain (loss) before provision for valuation allowances resulting from sales and other disposals of other real estate owned. + References No definition available. + Details
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- Details
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- Definition Amount of operating expenses recognized during the period for real estate assets acquired through settlement or foreclosure. + References No definition available. + Details
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- Definition The amount of real estate sold during the period net of gains (losses) on sale. + References No definition available. + Details
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- Definition Amount of the increase in the real estate owned valuation allowance, net of miscellaneous adjustments, that is charged against earnings in the period. + References No definition available. + Details
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- Definition Other real estate revenue not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + 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 Amount of real estate investments acquired through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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- Definition Amount of other deductions to real estate investments, excluding sales, for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule III) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28.4) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + 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 the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was sold, written down or written off. + 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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