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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (9,604) | $ (4,842)
Fair Value, Less Than Twelve Months | 137,638 | 256,800
Gross Unrealized Losses, Twelve Months and Over | (38,211) | (2,221)
Fair Value, Twelve Months and Over | 255,941 | 63,659
Gross Unrealized Losses, Total | (47,815) | (7,063)
Fair Value, Total | 393,579 | 320,459
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,522) | (1,598)
Fair Value, Less Than Twelve Months | 29,827 | 89,177
Gross Unrealized Losses, Twelve Months and Over | (8,535) |
Fair Value, Twelve Months and Over | 65,335 |
Gross Unrealized Losses, Total | (10,057) | (1,598)
Fair Value, Total | 95,162 | 89,177
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,066) | (1,898)
Fair Value, Less Than Twelve Months | 22,597 | 86,739
Gross Unrealized Losses, Twelve Months and Over | (15,819) | (1,584)
Fair Value, Twelve Months and Over | 115,423 | 41,738
Gross Unrealized Losses, Total | (16,885) | (3,482)
Fair Value, Total | 138,020 | 128,477
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (3,176) | (1,050)
Fair Value, Less Than Twelve Months | 33,338 | 63,157
Gross Unrealized Losses, Twelve Months and Over | (10,802) | (412)
Fair Value, Twelve Months and Over | 56,926 | 16,434
Gross Unrealized Losses, Total | (13,978) | (1,462)
Fair Value, Total | 90,264 | 79,591
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (3,840) | (296)
Fair Value, Less Than Twelve Months | 51,876 | 17,727
Gross Unrealized Losses, Twelve Months and Over | (3,055) | (225)
Fair Value, Twelve Months and Over | 18,257 | 5,487
Gross Unrealized Losses, Total | (6,895) | (521)
Fair Value, Total | $ 70,133 | $ 23,214

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