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Other Real Estate Owned (Tables) | 9 Months Ended
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Sep. 30, 2015
Other Real Estate Owned |
Schedule of activity in the other real estate owned (OREO) portfolio, net of valuation reserve |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
Other real estate owned |  | 2015 |  | 2014 |  | 2015 |  | 2014 |
Balance at beginning of period |  | $ | 31,964 |  | $ | 39,232 |  | $ | 31,982 |  | $ | 41,537 |
Property additions |  |  | 846 |  |  | 4,277 |  |  | 7,861 |  |  | 13,620 |
Property improvements |  |  | - |  |  | 506 |  |  | - |  |  | 637 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Property disposals, net of gains/losses |  |  | 7,231 |  |  | 1,618 |  |  | 11,567 |  |  | 12,136 |
Period valuation adjustments |  |  | 1,128 |  |  | 1,520 |  |  | 3,825 |  |  | 2,781 |
Balance at end of period |  | $ | 24,451 |  | $ | 40,877 |  | $ | 24,451 |  | $ | 40,877 |
Schedule of activity in valuation allowance |
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |
Balance at beginning of period |  | $ | 20,069 |  | $ | 17,873 |  | $ | 19,229 |  | $ | 22,284 |
Provision for unrealized losses |  |  | 1,128 |  |  | 1,520 |  |  | 3,825 |  |  | 2,781 |
Reductions taken on sales |  |  | (1,325) |  |  | (348) |  |  | (3,275) |  |  | (5,431) |
Other adjustments |  |  | - |  |  | - |  |  | 93 |  |  | (589) |
Balance at end of period |  | $ | 19,872 |  | $ | 19,045 |  | $ | 19,872 |  | $ | 19,045 |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |
Gain on sales, net |  | $ | (432) |  | $ | (201) |  | $ | (769) |  | $ | (610) |
Provision for unrealized losses |  |  | 1,128 |  |  | 1,520 |  |  | 3,825 |  |  | 2,781 |
Operating expenses |  |  | 518 |  |  | 884 |  |  | 2,268 |  |  | 3,132 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  | 237 |  |  | 196 |  |  | 607 |  |  | 638 |
|  | $ | 977 |  | $ | 2,007 |  | $ | 4,717 |  | $ | 4,665 |

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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
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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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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration