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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (148) | $ (6,965)
Fair Value, Less Than Twelve Months | 5,677 | 99,357
Gross Unrealized Losses, Twelve Months and Over | (49,841) | (41,501)
Fair Value, Twelve Months and Over | 341,325 | 286,095
Gross Unrealized Losses, Total | (49,989) | (48,466)
Fair Value, Total | 347,002 | 385,452
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months |  | (207)
Fair Value, Less Than Twelve Months |  | 9,121
Gross Unrealized Losses, Twelve Months and Over | (9,378) | (9,622)
Fair Value, Twelve Months and Over | 81,978 | 85,557
Gross Unrealized Losses, Total | (9,378) | (9,829)
Fair Value, Total | 81,978 | 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 | (17,231) | (15,969)
Fair Value, Twelve Months and Over | 123,762 | 114,906
Gross Unrealized Losses, Total | (17,231) | (17,050)
Fair Value, Total | 123,762 | 139,466
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months |  | (2,454)
Fair Value, Less Than Twelve Months |  | 26,905
Gross Unrealized Losses, Twelve Months and Over | (15,876) | (11,687)
Fair Value, Twelve Months and Over | 76,480 | 60,022
Gross Unrealized Losses, Total | (15,876) | (14,141)
Fair Value, Total | 76,480 | 86,927
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (148) | (3,223)
Fair Value, Less Than Twelve Months | 5,677 | 38,771
Gross Unrealized Losses, Twelve Months and Over | (7,356) | (4,223)
Fair Value, Twelve Months and Over | 59,105 | 25,610
Gross Unrealized Losses, Total | (7,504) | (7,446)
Fair Value, Total | $ 64,782 | $ 64,381

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