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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (201) | $ (26)
Fair Value, Less Than Twelve Months | 19,576 | 5,797
Gross Unrealized Losses, Twelve Months and Over | (36,041) | (36,835)
Fair Value, Twelve Months and Over | 333,026 | 345,911
Gross Unrealized Losses, Total | (36,242) | (36,861)
Fair Value, Total | 352,602 | 351,708
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (4) | (4)
Fair Value, Less Than Twelve Months | 562 | 494
Gross Unrealized Losses, Twelve Months and Over | (6,580) | (6,909)
Fair Value, Twelve Months and Over | 74,552 | 79,528
Gross Unrealized Losses, Total | (6,584) | (6,913)
Fair Value, Total | 75,114 | 80,022
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Twelve Months and Over | (12,324) | (12,738)
Fair Value, Twelve Months and Over | 128,571 | 128,222
Gross Unrealized Losses, Total | (12,324) | (12,738)
Fair Value, Total | 128,571 | 128,222
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (132) | (20)
Fair Value, Less Than Twelve Months | 15,445 | 4,372
Gross Unrealized Losses, Twelve Months and Over | (11,922) | (11,909)
Fair Value, Twelve Months and Over | 72,400 | 77,759
Gross Unrealized Losses, Total | (12,054) | (11,929)
Fair Value, Total | 87,845 | 82,131
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (65) | (2)
Fair Value, Less Than Twelve Months | 3,569 | 931
Gross Unrealized Losses, Twelve Months and Over | (5,215) | (5,279)
Fair Value, Twelve Months and Over | 57,503 | 60,402
Gross Unrealized Losses, Total | (5,280) | (5,281)
Fair Value, Total | $ 61,072 | $ 61,333

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