v3.26.1
Fair Value - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities $ 1,125,162 $ 1,030,568
Cash collateral held by counterparty and netting adjustments (3,898) (3,367)
Cash collateral held by counterparty and netting adjustments (3,898) (3,367)
U.S. Government Sponsored Entities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 25,879 26,298
U.S. Treasury securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 38,731 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 863,068 772,145
Private Label Residential Mortgage-Backed Securities [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 4,203 4,326
Corporate [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 92,360 91,798
Small Business Administration Loan Pools [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 77,335 80,205
State and Political Subdivisions [Member]    
Fair Value Of Assets And Liabilities Measured On Recurring Basis [Line Items]    
Available-for-sale securities 23,586 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 (3,898) (3,367)
Cash collateral held by counterparty and netting adjustments (3,898) (3,367)
Equity securities with readily determinable fair value 1,404 1,182
Total other assets 1,404 1,182
Total assets 36,237 33,065
Derivative liabilities 281 (8)
Cash collateral held by counterparty and netting adjustments 281 (8)
Total liabilities 281 (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 38,731 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 $ 5,547 $ 5,758
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Assets Other Assets
Total assets $ 1,091,978 $ 1,001,076
Derivative liabilities $ 2,723 $ 2,808
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Other Accrued Liabilities Accounts Payable and Other Accrued Liabilities
Total liabilities $ 2,723 $ 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 25,879 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 863,068 772,145
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 4,203 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 92,360 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 77,335 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 $ 23,586 $ 20,546