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Other Real Estate Owned (Tables) | 9 Months Ended
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Sep. 30, 2016
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 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Balance at beginning of period |  | $ | 16,252 |  | $ | 31,964 |  | $ | 19,141 |  | $ | 31,982 |
Property additions |  |  | 255 |  |  | 846 |  |  | 1,223 |  |  | 7,861 |
Property improvements |  |  | 4 |  |  | - |  |  | 16 |  |  | - |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Property disposals, net of gains/losses |  |  | 2,002 |  |  | 7,231 |  |  | 4,931 |  |  | 11,567 |
Period valuation adjustments |  |  | 365 |  |  | 1,128 |  |  | 1,305 |  |  | 3,825 |
Balance at end of period |  | $ | 14,144 |  | $ | 24,451 |  | $ | 14,144 |  | $ | 24,451 |
Schedule of activity in valuation allowance |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Balance at beginning of period |  | $ | 13,377 |  | $ | 20,069 |  | $ | 14,127 |  | $ | 19,229 |
Provision for unrealized losses |  |  | 365 |  |  | 1,128 |  |  | 1,305 |  |  | 3,825 |
Reductions taken on sales |  |  | (488) |  |  | (1,325) |  |  | (2,178) |  |  | (3,275) |
Other adjustments |  |  | - |  |  | - |  |  | - |  |  | 93 |
Balance at end of period |  | $ | 13,254 |  | $ | 19,872 |  | $ | 13,254 |  | $ | 19,872 |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |
Gain on sales, net |  | $ | (249) |  | $ | (432) |  | $ | (316) |  | $ | (769) |
Provision for unrealized losses |  |  | 365 |  |  | 1,128 |  |  | 1,305 |  |  | 3,825 |
Operating expenses |  |  | 361 |  |  | 518 |  |  | 1,217 |  |  | 2,268 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  | 51 |  |  | 237 |  |  | 163 |  |  | 607 |
Net OREO expense |  | $ | 426 |  | $ | 977 |  | $ | 2,043 |  | $ | 4,717 |

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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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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
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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
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