v3.25.4
Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities $ 1,030,568 $ 1,004,455
Held-to-maturity securities 4,098  
Cash collateral held by counterparty and netting adjustments (3,367) (7,173)
Cash collateral held by counterparty and netting adjustments (3,367) (7,173)
U.S. Government Sponsored Entities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 26,298 65,094
U.S. Treasury securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 35,250 86,563
Government-Sponsored Residential Mortgage-Backed Securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 772,145 565,510
Private Label Residential Mortgage-Backed Securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 4,326 124,664
Corporate [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 91,798 58,652
Small Business Administration Loan Pools [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 80,205 29,928
State and Political Subdivisions [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 20,546 74,044
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Total derivative assets (3,367) (7,173)
Cash collateral held by counterparty and netting adjustments (3,367) (7,173)
Equity securities with readily determinable fair value 1,182 1,009
Total other assets 1,182 1,009
Total assets 33,065 80,399
Derivative liabilities (8) 97
Cash collateral held by counterparty and netting adjustments (8) 97
Total liabilities (8) 97
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 35,250 86,563
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Total derivative assets $ 5,758 $ 8,055
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Total assets $ 1,001,076 $ 925,947
Derivative liabilities $ 2,808 $ 3,546
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Other Accrued Liabilities Accounts Payable and Other Accrued Liabilities
Total liabilities $ 2,808 $ 3,546
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government Sponsored Entities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 26,298 65,094
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Government-Sponsored Residential Mortgage-Backed Securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 772,145 565,510
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Private Label Residential Mortgage-Backed Securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 4,326 124,664
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 91,798 58,652
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Small Business Administration Loan Pools [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 80,205 29,928
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | State and Political Subdivisions [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities $ 20,546 $ 74,044