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Other Real Estate Owned (Tables) | 3 Months Ended
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Mar. 31, 2018
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 |  | 2018 |  | 2017 |
Balance at beginning of period |  | $ | 8,371 |  | $ | 11,916 |
Property additions |  |  | - |  |  | 3,416 |
Property improvements |  |  | 59 |  |  | - |
Less: |  |  |  |  |  |  |
Proceeds from property disposals, net of participation purchase and of gains/losses |  |  | 1,255 |  |  | 1,533 |
Period valuation adjustments |  |  | 112 |  |  | 318 |
Balance at end of period |  | $ | 7,063 |  | $ | 13,481 |
Schedule of activity in valuation allowance |
|  | Three Months Ended |
|  | March 31, |
|  | 2018 |  | 2017 |
Balance at beginning of period |  | $ | 8,208 |  | $ | 9,982 |
Provision for unrealized losses |  |  | 112 |  |  | 318 |
Reductions taken on sales |  |  | (221) |  |  | (641) |
Other adjustments |  |  | - |  |  | - |
Balance at end of period |  | $ | 8,099 |  | $ | 9,659 |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | Three Months Ended |
|  | March 31, |
|  | 2018 |  | 2017 |
Gain on sales, net |  | $ | (80) |  | $ | (74) |
Provision for unrealized losses |  |  | 112 |  |  | 318 |
Operating expenses |  |  | 156 |  |  | 523 |
Less: |  |  |  |  |  |  |
Lease revenue |  |  | 15 |  |  | 58 |
Net OREO expense |  | $ | 173 |  | $ | 709 |

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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
Period Type: | duration

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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