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Other Real Estate Owned (Tables) | 6 Months Ended
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Jun. 30, 2014
Other Real Estate Owned |
Schedule of activity in the other real estate owned (OREO) portfolio, net of valuation reserve |
|  | Three Months Ended |  | Six Months Ended
|  | J une 30, |  | June 30,
Other real estate owned |  | 2014 |  | 2013 |  | 2014 |  | 2013
Balance at beginning of period |  | $ | 40,220 |  | $ | 65,663 |  | $ | 41,537 |  | $ | 72,423
Property additions |  |  | 4,655 |  |  | 4,196 |  |  | 9,343 |  |  | 11,181
Development improvements |  |  | 131 |  |  | - |  |  | 131 |  |  | 50
Less: |  |  |  |  |  |  |  |  |  |  |  |
Property disposals, net of gains/losses |  |  | 4,949 |  |  | 7,804 |  |  | 10,518 |  |  | 19,465
Period valuation adjustments |  |  | 825 |  |  | 2,590 |  |  | 1,261 |  |  | 4,724
Balance at end of period |  | $ | 39,232 |  | $ | 59,465 |  | $ | 39,232 |  | $ | 59,465
Schedule of activity in valuation allowance |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Balance at beginning of period |  | $ | 19,484 |  | $ | 30,966 |  | $ | 22,284 |  | $ | 31,454
Provision for unrealized losses |  |  | 825 |  |  | 2,589 |  |  | 1,261 |  |  | 4,576
Reductions taken on sales |  |  | (2,436) |  |  | (3,112) |  |  | (5,083) |  |  | (5,734)
Other adjustments |  |  | - |  |  | 44 |  |  | (589) |  |  | 191
Balance at end of period |  | $ | 17,873 |  | $ | 30,487 |  | $ | 17,873 |  | $ | 30,487
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Gain on sales, net |  | $ | (23) |  | $ | (386) |  | $ | (409) |  | $ | (567)
Provision for unrealized losses |  |  | 825 |  |  | 2,589 |  |  | 1,261 |  |  | 4,576
Operating expenses |  |  | 1,011 |  |  | 1,356 |  |  | 2,248 |  |  | 3,055
Less: |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  | 163 |  |  | 257 |  |  | 442 |  |  | 665
|  | $ | 1,650 |  | $ | 3,302 |  | $ | 2,658 |  | $ | 6,399

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- Definition Tabular disclosure of expenses related to foreclosed assets, net of lease revenue. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References No definition available. + Details
Name: | osbc_OtherRealEstateExpensesRelatedToForeclosedAssetsTableTextBlock
Namespace Prefix: | osbc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the change in valuation allowance of other real estate on properties acquired through foreclosure. + References No definition available. + Details
Name: | osbc_OtherRealEstateValuationAllowanceRollForwardTableTextBlock
Namespace Prefix: | osbc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure of the change in other real estate on properties acquired through foreclosure. + References No definition available. + Details
Name: | osbc_RealEstateAcquiredThroughForeclosureRollForwardTableTextBlock
Namespace Prefix: | osbc_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration