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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 165,603 | $ 302,275
12 Months or less, Unrealized Loss | (9,305) | (18,609)
More than 12 months, Fair Value | 404,718 | 238,156
More than 12 months, Unrealized Loss | (85,053) | (49,159)
Total Fair Value | 570,321 | 540,431
Total Unrealized Loss | (94,358) | (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 | 715 | 21,042
12 Months or less, Unrealized Loss | (3) | (880)
More than 12 months, Fair Value | 59,404 | 39,567
More than 12 months, Unrealized Loss | (5,975) | (4,606)
Total Fair Value | 60,119 | 60,609
Total Unrealized Loss | (5,978) | (5,486)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 143,524 | 169,594
12 Months or less, Unrealized Loss | (7,518) | (13,016)
More than 12 months, Fair Value | 155,603 | 73,967
More than 12 months, Unrealized Loss | (42,011) | (20,624)
Total Fair Value | 299,127 | 243,561
Total Unrealized Loss | (49,529) | (33,640)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 21,364 | 111,639
12 Months or less, Unrealized Loss | (1,784) | (4,713)
More than 12 months, Fair Value | 189,711 | 124,622
More than 12 months, Unrealized Loss | (37,067) | (23,929)
Total Fair Value | 211,075 | 236,261
Total Unrealized Loss | $ (38,851) | $ (28,642)

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