v3.26.1
Securities - Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost, Total securities available for sale [1] $ 728,722 $ 726,941
Gross Unrealized Gains [1] 1,476 2,106
Gross Unrealized Losses [1] (50,461) (47,139)
Fair Value [1] 679,737 681,908
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 58,511 61,935
Gross Unrealized Gains 235 262
Gross Unrealized Losses (1,192) (1,180)
Fair Value 57,554 61,017
Obligations of States and Political Subdivisions [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost, Total securities available for sale 341,047 345,214
Gross Unrealized Gains 724 1,319
Gross Unrealized Losses (24,405) (21,735)
Fair Value 317,366 324,798
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost, Total securities available for sale 329,164 319,792
Gross Unrealized Gains 517 525
Gross Unrealized Losses (24,864) (24,224)
Fair Value $ 304,817 $ 296,093
[1] Excludes accrued interest receivable on securities of $3,815 and $4,371 at March 31, 2026 and December 31, 2025, respectively, that is recorded in Accrued interest receivable on the Consolidated Balance Sheets.