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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (19,970) | $ (4,842)
Fair Value, Less Than Twelve Months | 241,627 | 256,800
Gross Unrealized Losses, Twelve Months and Over | (19,685) | (2,221)
Fair Value, Twelve Months and Over | 148,312 | 63,659
Gross Unrealized Losses, Total | (39,655) | (7,063)
Fair Value, Total | 389,939 | 320,459
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (5,170) | (1,598)
Fair Value, Less Than Twelve Months | 71,736 | 89,177
Gross Unrealized Losses, Twelve Months and Over | (3,165) |
Fair Value, Twelve Months and Over | 6,774 |
Gross Unrealized Losses, Total | (8,335) | (1,598)
Fair Value, Total | 78,510 | 89,177
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (4,305) | (1,898)
Fair Value, Less Than Twelve Months | 55,400 | 86,739
Gross Unrealized Losses, Twelve Months and Over | (9,672) | (1,584)
Fair Value, Twelve Months and Over | 102,702 | 41,738
Gross Unrealized Losses, Total | (13,977) | (3,482)
Fair Value, Total | 158,102 | 128,477
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (6,432) | (1,050)
Fair Value, Less Than Twelve Months | 61,720 | 63,157
Gross Unrealized Losses, Twelve Months and Over | (5,581) | (412)
Fair Value, Twelve Months and Over | 32,261 | 16,434
Gross Unrealized Losses, Total | (12,013) | (1,462)
Fair Value, Total | 93,981 | 79,591
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (4,063) | (296)
Fair Value, Less Than Twelve Months | 52,771 | 17,727
Gross Unrealized Losses, Twelve Months and Over | (1,267) | (225)
Fair Value, Twelve Months and Over | 6,575 | 5,487
Gross Unrealized Losses, Total | (5,330) | (521)
Fair Value, Total | $ 59,346 | $ 23,214

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