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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 39,504 | $ 302,275
12 Months or less, Unrealized Loss | (601) | (18,609)
More than 12 months, Fair Value | 408,370 | 238,156
More than 12 months, Unrealized Loss | (57,078) | (49,159)
Total Fair Value | 447,874 | 540,431
Total Unrealized Loss | (57,679) | (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 | 224 | 21,042
12 Months or less, Unrealized Loss | (1) | (880)
More than 12 months, Fair Value | 56,760 | 39,567
More than 12 months, Unrealized Loss | (4,074) | (4,606)
Total Fair Value | 56,984 | 60,609
Total Unrealized Loss | (4,075) | (5,486)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 19,168 | 169,594
12 Months or less, Unrealized Loss | (78) | (13,016)
More than 12 months, Fair Value | 162,291 | 73,967
More than 12 months, Unrealized Loss | (23,500) | (20,624)
Total Fair Value | 181,459 | 243,561
Total Unrealized Loss | (23,578) | (33,640)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 20,112 | 111,639
12 Months or less, Unrealized Loss | (522) | (4,713)
More than 12 months, Fair Value | 189,319 | 124,622
More than 12 months, Unrealized Loss | (29,504) | (23,929)
Total Fair Value | 209,431 | 236,261
Total Unrealized Loss | $ (30,026) | $ (28,642)

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