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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 165,603 $ 302,275
12 Months or less, Unrealized Loss (9,305) (18,609)
More than 12 months, Fair Value 404,718 238,156
More than 12 months, Unrealized Loss (85,053) (49,159)
Total Fair Value 570,321 540,431
Total Unrealized Loss (94,358) (67,768)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 715 21,042
12 Months or less, Unrealized Loss (3) (880)
More than 12 months, Fair Value 59,404 39,567
More than 12 months, Unrealized Loss (5,975) (4,606)
Total Fair Value 60,119 60,609
Total Unrealized Loss (5,978) (5,486)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 143,524 169,594
12 Months or less, Unrealized Loss (7,518) (13,016)
More than 12 months, Fair Value 155,603 73,967
More than 12 months, Unrealized Loss (42,011) (20,624)
Total Fair Value 299,127 243,561
Total Unrealized Loss (49,529) (33,640)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 21,364 111,639
12 Months or less, Unrealized Loss (1,784) (4,713)
More than 12 months, Fair Value 189,711 124,622
More than 12 months, Unrealized Loss (37,067) (23,929)
Total Fair Value 211,075 236,261
Total Unrealized Loss $ (38,851) $ (28,642)