v3.26.1
Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities $ 1,229,692 $ 1,030,568
Cash collateral held by counterparty and netting adjustments (4,735) (3,367)
Cash collateral held by counterparty and netting adjustments (4,735) (3,367)
U.S. Government Sponsored Entities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 25,975 26,298
U.S. Treasury securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 40,041 35,250
Government-Sponsored Residential Mortgage-Backed Securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 960,229 772,145
Private Label Residential Mortgage-Backed Securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 4,038 4,326
Corporate [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 94,206 91,798
Small Business Administration Loan Pools [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 83,242 80,205
State and Political Subdivisions [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 21,961 20,546
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Total derivative assets (4,735) (3,367)
Cash collateral held by counterparty and netting adjustments (4,735) (3,367)
Equity securities with readily determinable fair value 1,600 1,182
Total other assets 1,600 1,182
Total assets 36,906 33,065
Derivative liabilities 19 (8)
Cash collateral held by counterparty and netting adjustments 19 (8)
Total liabilities 19 (8)
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 40,041 35,250
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Total derivative assets $ 5,935 $ 5,758
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Total assets $ 1,195,586 $ 1,001,076
Derivative liabilities $ 3,066 $ 2,808
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Other Accrued Liabilities Accounts Payable and Other Accrued Liabilities
Total liabilities $ 3,066 $ 2,808
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 25,975 26,298
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 960,229 772,145
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 4,038 4,326
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 94,206 91,798
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 83,242 80,205
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 $ 21,961 $ 20,546