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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (1,359) | $ (26)
Fair Value, Less Than Twelve Months | 91,400 | 5,797
Gross Unrealized Losses, Twelve Months and Over | (30,631) | (36,835)
Fair Value, Twelve Months and Over | 313,454 | 345,911
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (467) | (4)
Fair Value, Less Than Twelve Months | 31,533 | 494
Gross Unrealized Losses, Twelve Months and Over | (4,948) | (6,909)
Fair Value, Twelve Months and Over | 62,151 | 79,528
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Twelve Months and Over | (9,494) | (12,738)
Fair Value, Twelve Months and Over | 131,335 | 128,222
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (668) | (20)
Fair Value, Less Than Twelve Months | 51,236 | 4,372
Gross Unrealized Losses, Twelve Months and Over | (11,986) | (11,909)
Fair Value, Twelve Months and Over | 66,877 | 77,759
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (224) | (2)
Fair Value, Less Than Twelve Months | 8,631 | 931
Gross Unrealized Losses, Twelve Months and Over | (4,203) | (5,279)
Fair Value, Twelve Months and Over | $ 53,091 | $ 60,402

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