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Other Real Estate Owned (Tables) | 6 Months Ended
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Jun. 30, 2017
Other Real Estate Owned |
Schedule of activity in the other real estate owned (OREO) portfolio, net of valuation reserve |
|  | Quarters Ended |  | Six Months Ended |
|  | June 30, |  | June 30, |
Other real estate owned |  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Balance at beginning of period |  | $ | 13,481 |  | $ | 17,745 |  | $ | 11,916 |  | $ | 19,141 |
Property additions |  |  | 204 |  |  | 586 |  |  | 3,620 |  |  | 968 |
Property improvements |  |  | - |  |  | - |  |  | - |  |  | 12 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from property disposals, net of gains/losses |  |  | 1,569 |  |  | 1,590 |  |  | 3,102 |  |  | 2,929 |
Period valuation adjustments |  |  | 392 |  |  | 489 |  |  | 710 |  |  | 940 |
Balance at end of period |  | $ | 11,724 |  | $ | 16,252 |  | $ | 11,724 |  | $ | 16,252 |
Schedule of activity in valuation allowance |
|  | Quarters Ended |  | Six Months Ended |
|  | June 30, |  | June 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Balance at beginning of period |  | $ | 9,659 |  | $ | 14,399 |  | $ | 9,982 |  | $ | 14,127 |
Provision for unrealized losses |  |  | 392 |  |  | 489 |  |  | 710 |  |  | 940 |
Reductions taken on sales |  |  | (1,747) |  |  | (1,511) |  |  | (2,388) |  |  | (1,690) |
Balance at end of period |  | $ | 8,304 |  | $ | 13,377 |  | $ | 8,304 |  | $ | 13,377 |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | Quarters Ended |  | Six Months Ended |
|  | June 30, |  | June 30, |
|  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Gain on sales, net |  | $ | (104) |  | $ | (25) |  | $ | (178) |  | $ | (67) |
Provision for unrealized losses |  |  | 392 |  |  | 489 |  |  | 710 |  |  | 940 |
Operating expenses |  |  | 293 |  |  | 420 |  |  | 816 |  |  | 856 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  | 42 |  |  | 5 |  |  | 100 |  |  | 112 |
Net OREO expense |  | $ | 539 |  | $ | 879 |  | $ | 1,248 |  | $ | 1,617 |

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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
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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