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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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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)

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