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Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | $ 88,255 | $ 159,675
12 Months or less, Unrealized Loss | (788) | (1,186)
More than 12 months, Fair Value | 419,657 | 414,841
More than 12 months, Unrealized Loss | (51,430) | (61,687)
Total Fair Value | 507,912 | 574,516
Total Unrealized Loss | (52,218) | (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 | 987 | 32,388
12 Months or less, Unrealized Loss | 0 | (51)
More than 12 months, Fair Value | 54,108 | 55,000
More than 12 months, Unrealized Loss | (1,527) | (3,243)
Total Fair Value | 55,095 | 87,388
Total Unrealized Loss | (1,527) | (3,294)
Obligations of States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 49,651 | 98,965
12 Months or less, Unrealized Loss | (514) | (806)
More than 12 months, Fair Value | 187,277 | 173,668
More than 12 months, Unrealized Loss | (24,957) | (26,192)
Total Fair Value | 236,928 | 272,633
Total Unrealized Loss | (25,471) | (26,998)
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
12 Months or less, Fair Value | 37,617 | 28,322
12 Months or less, Unrealized Loss | (274) | (329)
More than 12 months, Fair Value | 178,272 | 186,173
More than 12 months, Unrealized Loss | (24,946) | (32,252)
Total Fair Value | 215,889 | 214,495
Total Unrealized Loss | $ (25,220) | $ (32,581)

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