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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (942) | $ (1,359)
Fair Value, Less Than Twelve Months | 104,700 | 91,400
Gross Unrealized Losses, Twelve Months and Over | (23,488) | (30,631)
Fair Value, Twelve Months and Over | 304,333 | 313,454
Gross Unrealized Losses, Total | (24,430) | (31,990)
Fair Value, Total | 409,033 | 404,854
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (133) | (467)
Fair Value, Less Than Twelve Months | 27,970 | 31,533
Gross Unrealized Losses, Twelve Months and Over | (3,535) | (4,948)
Fair Value, Twelve Months and Over | 63,088 | 62,151
Gross Unrealized Losses, Total | (3,668) | (5,415)
Fair Value, Total | 91,058 | 93,684
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (19) |
Fair Value, Less Than Twelve Months | 7,726 |
Gross Unrealized Losses, Twelve Months and Over | (6,717) | (9,494)
Fair Value, Twelve Months and Over | 126,054 | 131,335
Gross Unrealized Losses, Total | (6,736) | (9,494)
Fair Value, Total | 133,780 | 131,335
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (683) | (668)
Fair Value, Less Than Twelve Months | 63,251 | 51,236
Gross Unrealized Losses, Twelve Months and Over | (9,973) | (11,986)
Fair Value, Twelve Months and Over | 63,996 | 66,877
Gross Unrealized Losses, Total | (10,656) | (12,654)
Fair Value, Total | 127,247 | 118,113
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (107) | (224)
Fair Value, Less Than Twelve Months | 5,753 | 8,631
Gross Unrealized Losses, Twelve Months and Over | (3,263) | (4,203)
Fair Value, Twelve Months and Over | 51,195 | 53,091
Gross Unrealized Losses, Total | (3,370) | (4,427)
Fair Value, Total | $ 56,948 | $ 61,722

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