XML 104 R89.htm IDEA: XBRL DOCUMENT
v3.22.4

Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Assets: |  |
Securities available-for-sale | $ 1,539,359 | $ 1,693,632
Mortgage servicing rights | $ 11,189 | 7,097
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag | true |
Liabilities: |  |
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag | true |
U.S. Treasury |  |
Assets: |  |
Securities available-for-sale | $ 212,129 | 202,339
U.S. government agencies |  |
Assets: |  |
Securities available-for-sale | 56,048 | 61,888
States and political subdivisions |  |
Assets: |  |
Securities available-for-sale | 226,128 | 257,609
Corporate bonds |  |
Assets: |  |
Securities available-for-sale | 9,622 | 9,887
Collateralized mortgage obligations |  |
Assets: |  |
Securities available-for-sale | 533,768 | 672,967
Asset-backed Securities |  |
Assets: |  |
Securities available-for-sale | 201,928 | 236,877
Collateralized loan obligations. |  |
Assets: |  |
Securities available-for-sale | 174,746 | 79,763
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Securities available-for-sale | 212,129 | 202,339
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Securities available-for-sale | 1,291,219 | 1,476,057
Loans held-for-sale | 491 | 4,737
Other assets | 6,391 | 3,494
Liabilities: |  |
Other liabilities | 12,264 | 6,788
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Securities available-for-sale | 36,011 | 15,236
Mortgage servicing rights | 11,189 | 7,097
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Securities available-for-sale | 491 |
Loans held-for-sale |  | 4,737
Mortgage servicing rights | 11,189 | 7,097
Total financial assets | 1,557,631 | 1,709,468
Liabilities: |  |
Total | 12,265 | 6,809
Fair Value, Measurements, Recurring [Member] | Interest rate swap agreements, including risk participation agreement |  |
Assets: |  |
Securities available-for-sale | 6,516 |
Other assets |  | 3,494
Liabilities: |  |
Other liabilities | 12,265 | 6,809
Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] |  |
Assets: |  |
Securities available-for-sale | 76 |
Other assets |  | 508
Fair Value, Measurements, Recurring [Member] | U.S. Treasury |  |
Assets: |  |
Securities available-for-sale | 212,129 | 202,339
Fair Value, Measurements, Recurring [Member] | U.S. government agencies |  |
Assets: |  |
Securities available-for-sale | 56,048 | 61,888
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities, Issued by US Government Agencies |  |
Assets: |  |
Securities available-for-sale | 124,990 | 172,302
Fair Value, Measurements, Recurring [Member] | States and political subdivisions |  |
Assets: |  |
Securities available-for-sale | 226,128 | 257,609
Fair Value, Measurements, Recurring [Member] | Corporate bonds |  |
Assets: |  |
Securities available-for-sale | 9,622 | 9,887
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations |  |
Assets: |  |
Securities available-for-sale | 533,768 | 672,967
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities |  |
Assets: |  |
Securities available-for-sale | 201,928 | 236,877
Fair Value, Measurements, Recurring [Member] | Collateralized loan obligations. |  |
Assets: |  |
Securities available-for-sale | 174,746 | 79,763
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total financial assets | 212,129 | 202,339
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury |  |
Assets: |  |
Securities available-for-sale | 212,129 | 202,339
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Securities available-for-sale | 491 |
Loans held-for-sale |  | 4,737
Total financial assets | 1,298,302 | 1,484,796
Liabilities: |  |
Total | 12,265 | 6,809
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate swap agreements, including risk participation agreement |  |
Assets: |  |
Securities available-for-sale | 6,516 |
Other assets |  | 3,494
Liabilities: |  |
Other liabilities | 12,265 | 6,809
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member] |  |
Assets: |  |
Securities available-for-sale | 76 |
Other assets |  | 508
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government agencies |  |
Assets: |  |
Securities available-for-sale | 56,048 | 61,888
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities, Issued by US Government Agencies |  |
Assets: |  |
Securities available-for-sale | 124,990 | 172,302
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | States and political subdivisions |  |
Assets: |  |
Securities available-for-sale | 211,899 | 242,373
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds |  |
Assets: |  |
Securities available-for-sale | 9,622 | 9,887
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized mortgage obligations |  |
Assets: |  |
Securities available-for-sale | 526,998 | 672,967
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities |  |
Assets: |  |
Securities available-for-sale | 186,916 | 236,877
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized loan obligations. |  |
Assets: |  |
Securities available-for-sale | 174,746 | 79,763
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Mortgage servicing rights | 11,189 | 7,097
Total financial assets | 47,200 | 22,333
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | States and political subdivisions |  |
Assets: |  |
Securities available-for-sale | 14,229 | $ 15,236
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized mortgage obligations |  |
Assets: |  |
Securities available-for-sale | 6,770 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities |  |
Assets: |  |
Securities available-for-sale | $ 15,012 |

X
- Definition Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag + References No definition available. + Details
Name: | osbc_DerivativeAssetStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag
Namespace Prefix: | osbc_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag + References No definition available. + Details
Name: | osbc_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag
Namespace Prefix: | osbc_
Data Type: | xbrli:booleanItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
Name: | us-gaap_DerivativeLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
Name: | us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128311188&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateBondSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedLoanObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=osbc_MortgageBackedSecuritiesIssuedByUSGovernmentAgenciesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |