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Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2014
Other Real Estate Owned |
Schedule of activity in the other real estate owned (OREO) portfolio, net of valuation reserve |
|  | Twelve Months Ended |
|  | December 31, |
Other real estate owned |  | 2014 |  | 2013 |  | 2012 |
Balance at beginning of period |  | $ | 41,537 |  | $ | 72,423 |  | $ | 93,290 |
Property additions |  |  | 16,078 |  |  | 19,194 |  |  | 32,121 |
Property improvements |  |  | 794 |  |  | 73 |  |  | 701 |
Less: |  |  |  |  |  |  |  |  |  |
Property disposals, net of gains/losses |  |  | 21,868 |  |  | 41,712 |  |  | 36,854 |
Period valuation adjustments |  |  | 4,559 |  |  | 8,441 |  |  | 16,835 |
Balance at end of period |  | $ | 31,982 |  | $ | 41,537 |  | $ | 72,423 |
Schedule of activity in valuation allowance |
|  | 2014 |  | 2013 |  | 2012 |
Balance at beginning of period |  | $ | 22,284 |  | $ | 31,454 |  | $ | 23,462 |
Provision for unrealized losses |  |  | 4,559 |  |  | 8,293 |  |  | 16,385 |
Reductions taken on sales |  |  | (7,025) |  |  | (17,389) |  |  | (8,843) |
Other adjustments |  |  | (589) |  |  | (74) |  |  | 450 |
Balance at end of period |  | $ | 19,229 |  | $ | 22,284 |  | $ | 31,454 |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | 2014 |  | 2013 |  | 2012 |
Gain on sales, net |  | $ | (989) |  | $ | (1,956) |  | $ | (2,198) |
Provision for unrealized losses |  |  | 4,559 |  |  | 8,293 |  |  | 16,385 |
Operating expenses |  |  | 4,173 |  |  | 5,705 |  |  | 7,973 |
Less: |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  | 826 |  |  | 1,295 |  |  | 3,497 |
|  | $ | 6,917 |  | $ | 10,747 |  | $ | 18,663 |

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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
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- Details
Name: | us-gaap_RealEstateAbstract
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Balance Type: | na
Period Type: | duration