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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (3,281) | $ (140)
Fair Value, Less Than Twelve Months | 234,792 | 51,893
Gross Unrealized Losses, Twelve Months and Over | (126) |
Fair Value, Twelve Months and Over | 4,946 |
Gross Unrealized Losses, Total | (3,407) | (140)
Fair Value, Total | 239,738 | 51,893
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (572) |
Fair Value, Less Than Twelve Months | 58,913 |
Gross Unrealized Losses, Total | (572) |
Fair Value, Total | 58,913 |
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,636) | (130)
Fair Value, Less Than Twelve Months | 107,353 | 48,331
Gross Unrealized Losses, Twelve Months and Over | (62) |
Fair Value, Twelve Months and Over | 2,443 |
Gross Unrealized Losses, Total | (1,698) | (130)
Fair Value, Total | 109,796 | 48,331
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (907) |
Fair Value, Less Than Twelve Months | 57,266 |
Gross Unrealized Losses, Total | (907) |
Fair Value, Total | 57,266 |
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (166) | (10)
Fair Value, Less Than Twelve Months | 11,260 | 3,562
Gross Unrealized Losses, Twelve Months and Over | (64) |
Fair Value, Twelve Months and Over | 2,503 |
Gross Unrealized Losses, Total | (230) | (10)
Fair Value, Total | $ 13,763 | $ 3,562

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