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Other Real Estate Owned (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Activity in the other real estate owned (OREO) portfolio, net of valuation reserve |  |  |
Balance at beginning of period | $ 1,561 | $ 2,356 | $ 2,474
Property additions, net of acquisition adjustments | 5,580 | 87 | 5,748
Less: Proceeds from property disposals, net of participation purchase and of gains/losses | 1,749 | 778 | 5,787
Less: Period valuation write-down | 269 | 104 | 79
Balance at end of period | 5,123 | 1,561 | 2,356
Activity in the valuation allowance |  |  |
Balance at beginning of period | 856 | 1,179 | 1,643
Provision for unrealized losses | 269 | 104 | 79
Reductions taken on sales | (1,007) | (427) | (543)
Balance at end of period | 118 | 856 | 1,179
Expenses related to foreclosed assets, net of lease revenue |  |  |
Gain on sales, net | (256) | (163) | (41)
Provision for unrealized losses | 269 | 104 | 79
Operating expenses | 434 | 193 | 133
Less: Lease revenue | 48 | 4 | 4
Net OREO expense | $ 399 | $ 130 | $ 167

X
- Definition Amount of expense recognized during the period for real estate assets acquired through foreclosure, net of lease revenue. + References No definition available. + Details
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- Definition The net gain (loss) before provision for valuation allowances resulting from sales and other disposals of other real estate owned. + References No definition available. + Details
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- Definition Lease revenue for other real estate owned. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of operating expenses recognized during the period for real estate assets acquired through settlement or foreclosure. + References No definition available. + Details
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Namespace Prefix: | osbc_
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Balance Type: | debit
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- Definition The amount of real estate sold during the period net of gains (losses) on sale. + References No definition available. + Details
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- Definition Amount of expense (benefit) recognized in the income statement for a decrease (increase) in valuation of real estate owned (REO). + References No definition available. + Details
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- Definition Amount of the increase (decrease) in the real estate owned valuation allowance, net of miscellaneous adjustments, that is charged against earnings in the period. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481990/310-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-11 + Details
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- Definition For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was sold, written down or written off. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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