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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale $ 642,910 $ 648,067
Equity securities 2,318 2,421
Swap asset 3,900 6,330
(Level 1) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale 35,713 64,571
(Level 1) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | U.S. Treasury securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale 35,713 64,571
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale 607,197 583,496
Equity securities 2,318 2,421
Loans held for sale, at fair value 10,733  
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale, at fair value   665
Swap asset 3,130 5,308
Swap liability 7,030 11,638
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | Obligations of U.S. Government agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale 28,608 32,816
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale 316,335 325,119
(Level 2) [Member] | Assets Measured at Fair Value on a Recurring Basis [Member] | Mortgage-backed Securities in Government Sponsored Entities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale 262,254 225,561
(Level 3) [Member] | Assets Measured at Fair Value on a Nonrecurring Basis [Member] | Collateral-Dependent Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 7,945 $ 19,177