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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 50,921 | $ 39,504
12 Months or less, Unrealized Loss | (340) | (601)
More than 12 months, Fair Value | 429,236 | 408,370
More than 12 months, Unrealized Loss | (63,950) | (57,078)
Total Fair Value | 480,157 | 447,874
Total Unrealized Loss | (64,290) | (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 | 2,102 | 224
12 Months or less, Unrealized Loss | (5) | (1)
More than 12 months, Fair Value | 56,010 | 56,760
More than 12 months, Unrealized Loss | (4,433) | (4,074)
Total Fair Value | 58,112 | 56,984
Total Unrealized Loss | (4,438) | (4,075)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 48,073 | 19,168
12 Months or less, Unrealized Loss | (323) | (78)
More than 12 months, Fair Value | 171,551 | 162,291
More than 12 months, Unrealized Loss | (26,329) | (23,500)
Total Fair Value | 219,624 | 181,459
Total Unrealized Loss | (26,652) | (23,578)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 746 | 20,112
12 Months or less, Unrealized Loss | (12) | (522)
More than 12 months, Fair Value | 201,675 | 189,319
More than 12 months, Unrealized Loss | (33,188) | (29,504)
Total Fair Value | 202,421 | 209,431
Total Unrealized Loss | $ (33,200) | $ (30,026)

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