XML 52 R41.htm IDEA: XBRL DOCUMENT
v3.23.3

Loans and Allowance for Credit Losses on Loans (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | $ 55,314,000 | $ 45,388,000 | $ 49,480,000 | $ 44,281,000 |
(Release of) Provision for Credit Losses | 3,012,000 | 3,527,000 | 10,091,000 | 5,177,000 |
Charge-offs | 6,936,000 | 484,000 | 8,691,000 | 1,384,000 |
Recoveries | 339,000 | 416,000 | 849,000 | 773,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 51,729,000 | 48,847,000 | 51,729,000 | 48,847,000 |
Less: allowance for credit losses on loans | 51,729,000 | 48,847,000 | 51,729,000 | 48,847,000 | $ 49,480,000
Net provision expense |  |  | 8,500,000 |  |
Increased reserve on loans |  |  | 160,000,000.0 |  |
Allowance for credit loss unfunded commitment, purchase accounting adjustment | 149,000 |  | 149,000 |  |
Commercial |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 11,532,000 | 14,114,000 | 11,968,000 | 11,751,000 |
(Release of) Provision for Credit Losses | (1,025,000) | (919,000) | (1,287,000) | 1,488,000 |
Charge-offs | 20,000 | 67,000 | 427,000 | 149,000 |
Recoveries | 12,000 | 47,000 | 245,000 | 85,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 10,499,000 | 13,175,000 | 10,499,000 | 13,175,000 |
Less: allowance for credit losses on loans | 10,499,000 | 13,175,000 | 10,499,000 | 13,175,000 | 11,968,000
Leases |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 2,690,000 | 1,736,000 | 2,865,000 | 3,480,000 |
(Release of) Provision for Credit Losses | (193,000) | (24,000) | 498,000 | (1,768,000) |
Charge-offs |  | 178,000 | 882,000 | 178,000 |
Recoveries | 95,000 |  | 111,000 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 2,592,000 | 1,534,000 | 2,592,000 | 1,534,000 |
Less: allowance for credit losses on loans | 2,592,000 | 1,534,000 | 2,592,000 | 1,534,000 | 2,865,000
Commercial real estate - Investor |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 20,031,000 | 9,436,000 | 10,674,000 | 10,795,000 |
(Release of) Provision for Credit Losses | 4,726,000 | 256,000 | 14,117,000 | (664,000) |
Charge-offs | 6,774,000 | 124,000 | 6,845,000 | 604,000 |
Recoveries | 20,000 | 19,000 | 57,000 | 60,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 18,003,000 | 9,587,000 | 18,003,000 | 9,587,000 |
Less: allowance for credit losses on loans | 18,003,000 | 9,587,000 | 18,003,000 | 9,587,000 | 10,674,000
Commercial real estate - Owner occupied |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 12,562,000 | 11,478,000 | 15,001,000 | 4,913,000 |
(Release of) Provision for Credit Losses | (154,000) | 3,618,000 | (2,397,000) | 10,289,000 |
Charge-offs | 35,000 | 12,000 | 236,000 | 133,000 |
Recoveries | 12,000 | 87,000 | 17,000 | 102,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 12,385,000 | 15,171,000 | 12,385,000 | 15,171,000 |
Less: allowance for credit losses on loans | 12,385,000 | 15,171,000 | 12,385,000 | 15,171,000 | 15,001,000
Real estate - construction |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 1,179,000 | 1,535,000 | 1,546,000 | 3,373,000 |
(Release of) Provision for Credit Losses | (39,000) | 9,000 | (406,000) | (1,829,000) |
Recoveries | 100,000 |  | 100,000 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 1,240,000 | 1,544,000 | 1,240,000 | 1,544,000 |
Less: allowance for credit losses on loans | 1,240,000 | 1,544,000 | 1,240,000 | 1,544,000 | 1,546,000
Residential real estate - Investor |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 743,000 | 661,000 | 768,000 | 760,000 |
(Release of) Provision for Credit Losses | (55,000) | 147,000 | (104,000) | 33,000 |
Recoveries | 3,000 | 8,000 | 27,000 | 23,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 691,000 | 816,000 | 691,000 | 816,000 |
Less: allowance for credit losses on loans | 691,000 | 816,000 | 691,000 | 816,000 | 768,000
Residential real estate - Owner occupied |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 1,868,000 | 1,869,000 | 2,046,000 | 2,832,000 |
(Release of) Provision for Credit Losses | (36,000) | 149,000 | (260,000) | (919,000) |
Recoveries | 25,000 | 113,000 | 71,000 | 218,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 1,857,000 | 2,131,000 | 1,857,000 | 2,131,000 |
Less: allowance for credit losses on loans | 1,857,000 | 2,131,000 | 1,857,000 | 2,131,000 | 2,046,000
Multifamily |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 2,737,000 | 2,434,000 | 2,453,000 | 3,675,000 |
(Release of) Provision for Credit Losses | (165,000) | 33,000 | 119,000 | (1,208,000) |
Recoveries |  | 63,000 |  | 63,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 2,572,000 | 2,530,000 | 2,572,000 | 2,530,000 |
Less: allowance for credit losses on loans | 2,572,000 | 2,530,000 | 2,572,000 | 2,530,000 | 2,453,000
HELOC |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 1,694,000 | 1,542,000 | 1,806,000 | 2,510,000 |
(Release of) Provision for Credit Losses | (77,000) | 386,000 | (242,000) | (649,000) |
Recoveries | 35,000 | 35,000 | 88,000 | 102,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 1,652,000 | 1,963,000 | 1,652,000 | 1,963,000 |
Less: allowance for credit losses on loans | 1,652,000 | 1,963,000 | 1,652,000 | 1,963,000 | 1,806,000
Other |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance | 278,000 | 583,000 | 353,000 | 192,000 |
(Release of) Provision for Credit Losses | 30,000 | (128,000) | 53,000 | 404,000 |
Charge-offs | 107,000 | 103,000 | 301,000 | 320,000 |
Recoveries | 37,000 | 44,000 | 133,000 | 120,000 |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 238,000 | 396,000 | 238,000 | 396,000 |
Less: allowance for credit losses on loans | 238,000 | 396,000 | 238,000 | 396,000 | 353,000
Unfunded Loan Commitment |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Beginning Balance |  |  | 4,300,000 |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | 2,700,000 | 4,400,000 | 2,700,000 | 4,400,000 |
Less: allowance for credit losses on loans | 2,700,000 | 4,400,000 | 2,700,000 | 4,400,000 | 4,300,000
Allowance for credit loss unfunded commitment, purchase accounting adjustment | 149,000 | $ 1,000,000.0 | 149,000 | $ 1,000,000.0 | $ 819,000
Unfunded Loan Commitment | Other Liabilities [Member] |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
ACL on unfunded commitments | $ 2,900,000 |  | $ 2,900,000 |  |

X
- Definition Amount of purchase accounting adjustment of allowance for credit loss unfunded commitment. + References No definition available. + Details
Name: | osbc_AllowanceForCreditLossUnfundedCommitmentPurchaseAccountingAdjustment
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable and net investment in lease. + References No definition available. + Details
Name: | osbc_FinancingReceivableAndNetInvestmentInLeaseAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable and net investment in lease from recovery. + References No definition available. + Details
Name: | osbc_FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossRecovery
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable and net investment in lease from write-off. + References No definition available. + Details
Name: | osbc_FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable and net investment in lease. + References No definition available. + Details
Name: | osbc_FinancingReceivableAndNetInvestmentInLeaseExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix: | osbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_AllowanceForLoanAndLeaseLossesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482454/460-10-45-1 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_CommercialRealEstateInvestorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_CommercialRealEstateOwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_RealEstateInvestorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_RealEstateOwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=osbc_MultiFamilyLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_UnallocatedFinancingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |