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Other Real Estate Owned (Tables) | 12 Months Ended
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Dec. 31, 2022
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 |  | 2022 |  | 2021 | ​ | 2020
Balance at beginning of period | ​ | $ | 2,356 | ​ | $ | 2,474 | ​ | $ | 5,004
Property additions, net of acquisition adjustments | ​ | ​ | 87 | ​ | ​ | 5,748 | ​ | ​ | 898
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from property disposals, net of participation purchase and gains/losses | ​ | ​ | 778 | ​ | ​ | 5,787 | ​ | ​ | 3,071
Period valuation write-down | ​ | ​ | 104 | ​ | ​ | 79 | ​ | ​ | 357
Balance at end of period | ​ | $ | 1,561 | ​ | $ | 2,356 | ​ | $ | 2,474
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Schedule of activity in valuation allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Twelve Months Ended
​ |  | December 31,
​ |  | 2022 |  | 2021 |  | 2020
Balance at beginning of period | ​ | $ | 1,179 | ​ | $ | 1,643 | ​ | $ | 6,712
Provision for unrealized losses | ​ | ​ | 104 | ​ | ​ | 79 | ​ | ​ | 357
Reductions taken on sales | ​ | ​ | (427) | ​ | ​ | (543) | ​ | ​ | (5,426)
Balance at end of period | ​ | $ | 856 | ​ | $ | 1,179 | ​ | $ | 1,643
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
Schedule of expenses related to foreclosed assets, net of lease revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Twelve Months Ended
​ |  | December 31,
​ |  | 2022 |  | 2021 | ​ | 2020
Gain on sales, net | ​ | $ | (163) | ​ | $ | (41) | ​ | $ | (204)
Provision for unrealized losses | ​ | ​ | 104 | ​ | ​ | 79 | ​ | ​ | 357
Operating expenses | ​ | ​ | 193 | ​ | ​ | 133 | ​ | ​ | 535
Less: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Lease revenue | ​ | ​ | 4 | ​ | ​ | 4 | ​ | ​ | 37
Net OREO expense | ​ | $ | 130 | ​ | $ | 167 | ​ | $ | 651

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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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- 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_
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- Definition Tabular disclosure of the change in other real estate on properties acquired through foreclosure. + References No definition available. + Details
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Namespace Prefix: | osbc_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration