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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)

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