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Other Real Estate Owned (Tables) | 3 Months Ended
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Mar. 31, 2017
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 |  | 2017 |  | 2016 |
Balance at beginning of period |  | $ | 11,916 |  | $ | 19,141 |
Property additions |  |  | 3,416 |  |  | 382 |
Property improvements |  |  | - |  |  | 12 |
Less: |  |  |  |  |  |  |
Proceeds from property disposals, net of gains/losses |  |  | 1,533 |  |  | 1,339 |
Period valuation adjustments |  |  | 318 |  |  | 451 |
Balance at end of period |  | $ | 13,481 |  | $ | 17,745 |
Schedule of activity in valuation allowance |
|  | Three Months Ended |
|  | March 31, |
|  | 2017 |  | 2016 |
Balance at beginning of period |  | $ | 9,982 |  | $ | 14,127 |
Provision for unrealized losses |  |  | 318 |  |  | 451 |
Reductions taken on sales |  |  | (641) |  |  | (179) |
Balance at end of period |  | $ | 9,659 |  | $ | 14,399 |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | Three Months Ended |
|  | March 31, |
|  | 2017 |  | 2016 |
Gain on sales, net |  | $ | (74) |  | $ | (42) |
Provision for unrealized losses |  |  | 318 |  |  | 451 |
Operating expenses |  |  | 523 |  |  | 436 |
Less: |  |  |  |  |  |  |
Lease revenue |  |  | 58 |  |  | 107 |
Net OREO expense |  | $ | 709 |  | $ | 738 |

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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
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