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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 21,290 $ 39,504
12 Months or less, Unrealized Loss (67) (601)
More than 12 months, Fair Value 428,807 408,370
More than 12 months, Unrealized Loss (47,726) (57,078)
Total Fair Value 450,097 447,874
Total Unrealized Loss (47,793) (57,679)
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 0 224
12 Months or less, Unrealized Loss 0 (1)
More than 12 months, Fair Value 55,627 56,760
More than 12 months, Unrealized Loss (2,514) (4,074)
Total Fair Value 55,627 56,984
Total Unrealized Loss (2,514) (4,075)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 21,290 19,168
12 Months or less, Unrealized Loss (67) (78)
More than 12 months, Fair Value 175,189 162,291
More than 12 months, Unrealized Loss (20,622) (23,500)
Total Fair Value 196,479 181,459
Total Unrealized Loss (20,689) (23,578)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 0 20,112
12 Months or less, Unrealized Loss 0 (522)
More than 12 months, Fair Value 197,991 189,319
More than 12 months, Unrealized Loss (24,590) (29,504)
Total Fair Value 197,991 209,431
Total Unrealized Loss $ (24,590) $ (30,026)