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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (74) | $ (26)
Fair Value, Less Than Twelve Months | 6,127 | 5,797
Gross Unrealized Losses, Twelve Months and Over | (38,733) | (36,835)
Fair Value, Twelve Months and Over | 335,231 | 345,911
Gross Unrealized Losses, Total | (38,807) | (36,861)
Fair Value, Total | 341,358 | 351,708
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (3) | (4)
Fair Value, Less Than Twelve Months | 561 | 494
Gross Unrealized Losses, Twelve Months and Over | (7,146) | (6,909)
Fair Value, Twelve Months and Over | 74,132 | 79,528
Gross Unrealized Losses, Total | (7,149) | (6,913)
Fair Value, Total | 74,693 | 80,022
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Twelve Months and Over | (13,190) | (12,738)
Fair Value, Twelve Months and Over | 127,738 | 128,222
Gross Unrealized Losses, Total | (13,190) | (12,738)
Fair Value, Total | 127,738 | 128,222
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (33) | (20)
Fair Value, Less Than Twelve Months | 4,321 | 4,372
Gross Unrealized Losses, Twelve Months and Over | (13,048) | (11,909)
Fair Value, Twelve Months and Over | 74,083 | 77,759
Gross Unrealized Losses, Total | (13,081) | (11,929)
Fair Value, Total | 78,404 | 82,131
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (38) | (2)
Fair Value, Less Than Twelve Months | 1,245 | 931
Gross Unrealized Losses, Twelve Months and Over | (5,349) | (5,279)
Fair Value, Twelve Months and Over | 59,278 | 60,402
Gross Unrealized Losses, Total | (5,387) | (5,281)
Fair Value, Total | $ 60,523 | $ 61,333

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