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Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2016
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 |  | 2016 |  | 2015 |  | 2014 |
Balance at beginning of period |  | $ | 19,141 |  | $ | 31,982 |  | $ | 41,537 |
Property additions |  |  | 1,785 |  |  | 8,998 |  |  | 16,078 |
Property improvements |  |  | 16 |  |  | - |  |  | 794 |
Less: |  |  |  |  |  |  |  |  |  |
Proceeds from property disposals, net of gains/losses |  |  | 7,456 |  |  | 17,763 |  |  | 21,868 |
Period valuation adjustments |  |  | 1,570 |  |  | 4,076 |  |  | 4,559 |
Balance at end of period |  | $ | 11,916 |  | $ | 19,141 |  | $ | 31,982 |
Schedule of activity in valuation allowance |
|  | Twelve Months Ended |
|  | December 31, |
|  | 2016 |  | 2015 |  | 2014 |
Balance at beginning of period |  | $ | 14,127 |  | $ | 19,229 |  | $ | 22,284 |
Provision for unrealized losses |  |  | 1,570 |  |  | 4,076 |  |  | 4,559 |
Reductions taken on sales |  |  | (5,867) |  |  | (9,271) |  |  | (7,025) |
Other adjustments |  |  | 152 |  |  | 93 |  |  | (589) |
Balance at end of period |  | $ | 9,982 |  | $ | 14,127 |  | $ | 19,229 |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | Twelve Months Ended |
|  | December 31, |
|  | 2016 |  | 2015 |  | 2014 |
Gain on sales, net |  | $ | (374) |  | $ | (1,073) |  | $ | (989) |
Provision for unrealized losses |  |  | 1,570 |  |  | 4,076 |  |  | 4,559 |
Operating expenses |  |  | 1,765 |  |  | 2,888 |  |  | 4,173 |
Less: |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  | 218 |  |  | 700 |  |  | 826 |
Net OREO expense |  | $ | 2,743 |  | $ | 5,191 |  | $ | 6,917 |

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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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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
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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