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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (499) | $ (6,965)
Fair Value, Less Than Twelve Months | 14,126 | 99,357
Gross Unrealized Losses, Twelve Months and Over | (45,042) | (41,501)
Fair Value, Twelve Months and Over | 344,860 | 286,095
Gross Unrealized Losses, Total | (45,541) | (48,466)
Fair Value, Total | 358,986 | 385,452
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (11) | (207)
Fair Value, Less Than Twelve Months | 487 | 9,121
Gross Unrealized Losses, Twelve Months and Over | (8,896) | (9,622)
Fair Value, Twelve Months and Over | 85,640 | 85,557
Gross Unrealized Losses, Total | (8,907) | (9,829)
Fair Value, Total | 86,127 | 94,678
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months |  | (1,081)
Fair Value, Less Than Twelve Months |  | 24,560
Gross Unrealized Losses, Twelve Months and Over | (16,157) | (15,969)
Fair Value, Twelve Months and Over | 127,891 | 114,906
Gross Unrealized Losses, Total | (16,157) | (17,050)
Fair Value, Total | 127,891 | 139,466
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (124) | (2,454)
Fair Value, Less Than Twelve Months | 2,826 | 26,905
Gross Unrealized Losses, Twelve Months and Over | (13,586) | (11,687)
Fair Value, Twelve Months and Over | 78,830 | 60,022
Gross Unrealized Losses, Total | (13,710) | (14,141)
Fair Value, Total | 81,656 | 86,927
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (364) | (3,223)
Fair Value, Less Than Twelve Months | 10,813 | 38,771
Gross Unrealized Losses, Twelve Months and Over | (6,403) | (4,223)
Fair Value, Twelve Months and Over | 52,499 | 25,610
Gross Unrealized Losses, Total | (6,767) | (7,446)
Fair Value, Total | $ 63,312 | $ 64,381

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