XML 105 R88.htm IDEA: XBRL DOCUMENT
v3.20.4

Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Assets: |  |
Securities available-for-sale | $ 496,178 | $ 484,648
Mortgage servicing rights | 4,224 | 5,935
US Treasury Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 4,117 | 4,036
US Government Corporations and Agencies Securities [Member] |  |
Assets: |  |
Securities available-for-sale |  | 8,337
US States and Political Subdivisions Debt Securities [Member] |  |
Assets and liabilities measured at fair value on a recurring basis |  |
Purchases | 13,086 | 17,938
Assets: |  |
Securities available-for-sale | 249,259 | 249,175
Collateralized Mortgage Obligations [Member] |  |
Assets: |  |
Securities available-for-sale | 56,585 | 57,984
Asset-backed Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 131,818 | 81,844
Collateralized loan obligations |  |
Assets: |  |
Securities available-for-sale | 30,533 | 66,684
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Securities available-for-sale | 4,117 | 4,036
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Securities available-for-sale | 487,742 | 475,193
Loans held-for-sale | 12,611 | 3,061
Other assets | 9,388 | 2,771
Liabilities: |  |
Other liabilities | 13,071 | 5,921
Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Securities available-for-sale | 4,319 | 5,419
Recurring |  |
Assets: |  |
Loans held-for-sale | 12,611 | 3,061
Mortgage servicing rights | 4,224 | 5,935
Total financial assets | 523,241 | 496,665
Liabilities: |  |
Total | 13,159 | 5,974
Recurring | Interest Rate Swap [Member] |  |
Assets: |  |
Other assets | 9,388 | 2,771
Liabilities: |  |
Other liabilities | 13,159 | 5,974
Recurring | Forward Contracts [Member] |  |
Assets: |  |
Other assets | 840 | 250
Recurring | US Treasury Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 4,117 | 4,036
Recurring | US Government Corporations and Agencies Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 6,657 | 8,337
Recurring | Mortgage Backed Securities, Issued by US Government Agencies [Member] |  |
Assets: |  |
Securities available-for-sale | 17,209 | 16,588
Recurring | US States and Political Subdivisions Debt Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 249,259 | 249,175
Recurring | Collateralized Mortgage Obligations [Member] |  |
Assets: |  |
Securities available-for-sale | 56,585 | 57,984
Recurring | Asset-backed Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 131,818 | 81,844
Recurring | Collateralized loan obligations |  |
Assets: |  |
Securities available-for-sale | 30,533 | 66,684
Recurring | Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Total financial assets | 4,117 | 4,036
Recurring | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 4,117 | 4,036
Recurring | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Loans held-for-sale | 12,611 | 3,061
Total financial assets | 510,581 | 481,275
Liabilities: |  |
Total | 13,159 | 5,974
Recurring | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |
Assets: |  |
Other assets | 9,388 | 2,771
Liabilities: |  |
Other liabilities | 13,159 | 5,974
Recurring | Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member] |  |
Assets: |  |
Other assets | 840 | 250
Recurring | Fair Value, Inputs, Level 2 [Member] | US Government Corporations and Agencies Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 6,657 | 8,337
Recurring | Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities, Issued by US Government Agencies [Member] |  |
Assets: |  |
Securities available-for-sale | 17,209 | 16,588
Recurring | Fair Value, Inputs, Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 244,940 | 243,756
Recurring | Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations [Member] |  |
Assets: |  |
Securities available-for-sale | 56,585 | 57,984
Recurring | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member] |  |
Assets: |  |
Securities available-for-sale | 131,818 | 81,844
Recurring | Fair Value, Inputs, Level 2 [Member] | Collateralized loan obligations |  |
Assets: |  |
Securities available-for-sale | 30,533 | 66,684
Recurring | Fair Value, Inputs, Level 3 [Member] |  |
Assets: |  |
Mortgage servicing rights | 4,224 | 5,935
Total financial assets | 8,543 | 11,354
Recurring | Fair Value, Inputs, Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member] |  |
Assets: |  |
Securities available-for-sale | $ 4,319 | $ 5,419

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 http://asc.fasb.org/extlink&oid=117815213&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 and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecurities
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://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 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
Name: | us-gaap_DerivativeLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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 http://asc.fasb.org/extlink&oid=117815213&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 http://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 http://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 http://asc.fasb.org/extlink&oid=116651436&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 http://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_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: |