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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
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value $ 426,556 $ 358,478
State and Local Governments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value 64,760 67,854
Level 3 [Member] | State and Local Governments [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value $ 1,627 $ 2,460
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 $ 2,988 $ 22,676
Valuation Technique us-gaap:MarketApproachValuationTechniqueMember us-gaap:MarketApproachValuationTechniqueMember
Unobservable Inputs us-gaap:MeasurementInputAppraisedValueMember us-gaap:MeasurementInputAppraisedValueMember
Level 3 [Member] | Loan Servicing Right [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair Value   $ 58
Valuation Technique   us-gaap:ValuationTechniqueDiscountedCashFlowMember
Unobservable Inputs   us-gaap:MeasurementInputDiscountRateMember
Fair Value $ (4)  
Valuation Technique us-gaap:ValuationTechniqueDiscountedCashFlowMember  
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 (0.0361) (0.0017)
Level 3 [Member] | Minimum [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.20 0
Level 3 [Member] | Minimum [Member] | Loan Servicing Right [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate   0.0511
Discount rate 0.0936  
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 0.0452 0.0492
Level 3 [Member] | Maximum [Member] | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.30 0.50
Level 3 [Member] | Maximum [Member] | Loan Servicing Right [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate   0.228
Discount rate 6.187  
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 0.0433 0.0349
Level 3 [Member] | Weighted Average | Collateral Dependent Loans [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate 0.2078 0.0041
Level 3 [Member] | Weighted Average | Loan Servicing Right [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Discount rate   0.1087
Discount rate 1.079