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Other Real Estate Owned (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Activity in the other real estate owned (OREO) portfolio, net of valuation reserve |  |  |
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 of gains/losses | 778 | 5,787 | 3,071
Less: Period valuation write-down | 104 | 79 | 357
Balance at end of period | 1,561 | 2,356 | 2,474
Activity in the valuation allowance |  |  |
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
Expenses related to foreclosed assets, net of lease revenue |  |  |
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

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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Balance Type: | debit
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X
- 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_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition NA + References No definition available. + Details
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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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Namespace Prefix: | osbc_
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4437-111522 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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