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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (425) | $ (1,359)
Fair Value, Less Than Twelve Months | 73,807 | 91,400
Gross Unrealized Losses, Twelve Months and Over | (25,308) | (30,631)
Fair Value, Twelve Months and Over | 313,390 | 313,454
Gross Unrealized Losses, Total | (25,733) | (31,990)
Fair Value, Total | 387,197 | 404,854
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (179) | (467)
Fair Value, Less Than Twelve Months | 35,601 | 31,533
Gross Unrealized Losses, Twelve Months and Over | (4,056) | (4,948)
Fair Value, Twelve Months and Over | 62,680 | 62,151
Gross Unrealized Losses, Total | (4,235) | (5,415)
Fair Value, Total | 98,281 | 93,684
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Twelve Months and Over | (7,687) | (9,494)
Fair Value, Twelve Months and Over | 131,113 | 131,335
Gross Unrealized Losses, Total | (7,687) | (9,494)
Fair Value, Total | 131,113 | 131,335
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (147) | (668)
Fair Value, Less Than Twelve Months | 31,890 | 51,236
Gross Unrealized Losses, Twelve Months and Over | (10,095) | (11,986)
Fair Value, Twelve Months and Over | 66,396 | 66,877
Gross Unrealized Losses, Total | (10,242) | (12,654)
Fair Value, Total | 98,286 | 118,113
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (99) | (224)
Fair Value, Less Than Twelve Months | 6,316 | 8,631
Gross Unrealized Losses, Twelve Months and Over | (3,470) | (4,203)
Fair Value, Twelve Months and Over | 53,201 | 53,091
Gross Unrealized Losses, Total | (3,569) | (4,427)
Fair Value, Total | $ 59,517 | $ 61,722

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