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Fair Value of Financial Instruments - Quantitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements (Detail)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value $ 422,773 $ 426,556
State and Local Governments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value 61,960 64,760
Level 3 [Member] | State and Local Governments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value $ 1,458 $ 1,627
Valuation Technique us-gaap:ValuationTechniqueDiscountedCashFlowMember us-gaap:ValuationTechniqueDiscountedCashFlowMember
Unobservable Inputs us-gaap:MeasurementInputDiscountRateMember us-gaap:MeasurementInputDiscountRateMember
Level 3 [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value $ 4,646 $ 2,988
Valuation Technique us-gaap:MarketApproachValuationTechniqueMember us-gaap:MarketApproachValuationTechniqueMember
Unobservable Inputs us-gaap:MeasurementInputAppraisedValueMember us-gaap:MeasurementInputAppraisedValueMember
Level 3 [Member] | Loan Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value $ 1,982  
Valuation Technique us-gaap:ValuationTechniqueDiscountedCashFlowMember  
Unobservable Inputs us-gaap:MeasurementInputDiscountRateMember  
Fair Value   $ (4)
Valuation Technique   us-gaap:MarketApproachValuationTechniqueMember
Unobservable Inputs   us-gaap:MeasurementInputDiscountRateMember
Level 3 [Member] | Minimum [Member] | State and Local Governments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.0312 (0.0361)
Level 3 [Member] | Minimum [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.2000 0.2000
Level 3 [Member] | Minimum [Member] | Loan Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.151  
Discount rate   0.0936
Level 3 [Member] | Weighted Average | State and Local Governments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.0381 0.0433
Level 3 [Member] | Weighted Average | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.20 0.2078
Level 3 [Member] | Weighted Average | Loan Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.1879  
Discount rate   1.079
Level 3 [Member] | Maximum [Member] | State and Local Governments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.0391 0.0452
Level 3 [Member] | Maximum [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.20 0.3000
Level 3 [Member] | Maximum [Member] | Loan Servicing Rights [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 5.4099  
Discount rate   6.187