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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 166,719 | $ 159,675
12 Months or less, Unrealized Loss | (3,156) | (1,186)
More than 12 months, Fair Value | 409,303 | 414,841
More than 12 months, Unrealized Loss | (60,718) | (61,687)
Total Fair Value | 576,022 | 574,516
Total Unrealized Loss | (63,874) | (62,873)
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 | 3,018 | 32,388
12 Months or less, Unrealized Loss | (7) | (51)
More than 12 months, Fair Value | 53,495 | 55,000
More than 12 months, Unrealized Loss | (2,048) | (3,243)
Total Fair Value | 56,513 | 87,388
Total Unrealized Loss | (2,055) | (3,294)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 118,939 | 98,965
12 Months or less, Unrealized Loss | (2,610) | (806)
More than 12 months, Fair Value | 174,257 | 173,668
More than 12 months, Unrealized Loss | (30,444) | (26,192)
Total Fair Value | 293,196 | 272,633
Total Unrealized Loss | (33,054) | (26,998)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 44,762 | 28,322
12 Months or less, Unrealized Loss | (539) | (329)
More than 12 months, Fair Value | 181,551 | 186,173
More than 12 months, Unrealized Loss | (28,226) | (32,252)
Total Fair Value | 226,313 | 214,495
Total Unrealized Loss | $ (28,765) | $ (32,581)

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