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Other Real Estate Owned (Tables) | 3 Months Ended
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Mar. 31, 2015
Other Real Estate Owned |
Schedule of activity in the other real estate owned (OREO) portfolio, net of valuation reserve |
|  | Three Months Ended |  |
|  | March 31, |  |
Other real estate owned |  | 2015 |  | 2014 |  |
Balance at beginning of period |  | $ | 31,982 |  | $ | 41,537 |  |
Property additions |  |  | 6,108 |  |  | 4,688 |  |
Property improvements |  |  | - |  |  | - |  |
Less: |  |  |  |  |  |  |  |
Property disposals, net of gains/losses |  |  | 2,020 |  |  | 5,569 |  |
Period valuation adjustments |  |  | 609 |  |  | 436 |  |
Balance at end of period |  | $ | 35,461 |  | $ | 40,220 |  |
Schedule of activity in valuation allowance |
|  | 2015 |  | 2014 |  |
Balance at beginning of period |  | $ | 19,229 |  | $ | 22,284 |  |
Provision for unrealized losses |  |  | 609 |  |  | 436 |  |
Reductions taken on sales |  |  | (382) |  |  | (2,647) |  |
Other adjustments |  |  | - |  |  | (589) |  |
Balance at end of period |  | $ | 19,456 |  | $ | 19,484 |  |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | 2015 |  | 2014 |  |
Gain on sales, net |  | $ | (95) |  | $ | (386) |  |
Provision for unrealized losses |  |  | 609 |  |  | 436 |  |
Operating expenses |  |  | 1,001 |  |  | 1,237 |  |
Less: |  |  |  |  |  |  |  |
Lease revenue |  |  | 163 |  |  | 279 |  |
|  | $ | 1,352 |  | $ | 1,008 |  |

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