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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value $ 159,675 $ 39,504
12 Months or less, Unrealized Loss (1,186) (601)
More than 12 months, Fair Value 414,841 408,370
More than 12 months, Unrealized Loss (61,687) (57,078)
Total Fair Value 574,516 447,874
Total Unrealized Loss (62,873) (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 32,388 224
12 Months or less, Unrealized Loss (51) (1)
More than 12 months, Fair Value 55,000 56,760
More than 12 months, Unrealized Loss (3,243) (4,074)
Total Fair Value 87,388 56,984
Total Unrealized Loss (3,294) (4,075)
Obligations of States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 98,965 19,168
12 Months or less, Unrealized Loss (806) (78)
More than 12 months, Fair Value 173,668 162,291
More than 12 months, Unrealized Loss (26,192) (23,500)
Total Fair Value 272,633 181,459
Total Unrealized Loss (26,998) (23,578)
Mortgage-backed Securities in Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
12 Months or less, Fair Value 28,322 20,112
12 Months or less, Unrealized Loss (329) (522)
More than 12 months, Fair Value 186,173 189,319
More than 12 months, Unrealized Loss (32,252) (29,504)
Total Fair Value 214,495 209,431
Total Unrealized Loss $ (32,581) $ (30,026)