v3.26.1
Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale [1] $ 667,314 $ 681,908
Equity securities 2,865 2,692
Swap asset 4,580 2,180
(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 17,547 33,902
(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 17,547 33,902
(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 649,767 648,006
Equity securities 2,865 2,692
(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]    
Swap asset 2,352 3,494
Swap liability 6,584 5,748
(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 19,062 27,115
(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 317,479 324,798
(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 313,226 296,093
(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 $ 9,736 $ 13,140
[1] Excludes accrued interest receivable on securities of $4,288 and $4,371 at June 30, 2026 and December 31, 2025, respectively, that is recorded in Accrued interest receivable on the Consolidated Balance Sheets.