v3.26.1
Securities - Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost, Total securities available for sale [1] $ 711,945 $ 726,941
Gross Unrealized Gains [1] 1,938 2,106
Gross Unrealized Losses [1] (46,569) (47,139)
Fair Value [1] 667,314 681,908
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost, Total securities available for sale 37,615 61,935
Gross Unrealized Gains 199 262
Gross Unrealized Losses (1,205) (1,180)
Fair Value 36,610 61,017
Obligations of States and Political Subdivisions [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost, Total securities available for sale 336,632 345,214
Gross Unrealized Gains 1,199 1,319
Gross Unrealized Losses (20,352) (21,735)
Fair Value 317,479 324,798
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost, Total securities available for sale 337,698 319,792
Gross Unrealized Gains 540 525
Gross Unrealized Losses (25,012) (24,224)
Fair Value $ 313,226 $ 296,093
[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.