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v3.19.3

Other Real Estate Owned (Tables) | 9 Months Ended
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Sep. 30, 2019
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 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Balance at beginning of period |  | $ | 5,668 |  | $ | 8,912 |  | $ | 7,175 |  | $ | 8,371 |
Property additions, net of acquisition adjustments |  |  | 305 |  |  | (217) |  |  | 305 |  |  | 2,595 |
Property improvements |  |  | - |  |  | - |  |  | - |  |  | 59 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from property disposals, net of participation purchase and of gains/losses |  |  | 1,088 |  |  | 1,612 |  |  | 2,390 |  |  | 3,576 |
Period valuation adjustments |  |  | 203 |  |  | 119 |  |  | 399 |  |  | 485 |
Other adjustments |  |  | - |  |  | - |  |  | 9 |  |  | - |
Balance at end of period |  | $ | 4,682 |  | $ | 6,964 |  | $ | 4,682 |  | $ | 6,964 |
Schedule of activity in valuation allowance |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Balance at beginning of period |  | $ | 8,061 |  | $ | 8,348 |  | $ | 8,027 |  | $ | 8,208 |
Provision for unrealized losses |  |  | 203 |  |  | 119 |  |  | 399 |  |  | 485 |
Reductions taken on sales |  |  | (798) |  |  | (456) |  |  | (960) |  |  | (682) |
Balance at end of period |  | $ | 7,466 |  | $ | 8,011 |  | $ | 7,466 |  | $ | 8,011 |
Schedule of expenses related to foreclosed assets, net of lease revenue |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2019 |  | 2018 |  | 2019 |  | 2018 |
Gain on sales, net |  | $ | (104) |  | $ | (612) |  | $ | (254) |  | $ | (716) |
Provision for unrealized losses |  |  | 203 |  |  | 119 |  |  | 399 |  |  | 485 |
Operating expenses |  |  | (73) |  |  | 133 |  |  | 184 |  |  | 502 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |
Lease revenue |  |  | - |  |  | 10 |  |  | 5 |  |  | 39 |
Net OREO expense |  | $ | 26 |  | $ | (370) |  | $ | 324 |  | $ | 232 |

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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