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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (4,637) | $ (140)
Fair Value, Less Than Twelve Months | 213,054 | 51,893
Gross Unrealized Losses, Total | (4,637) | (140)
Fair Value, Total | 213,054 | 51,893
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (734) |
Fair Value, Less Than Twelve Months | 43,325 |
Gross Unrealized Losses, Total | (734) |
Fair Value, Total | 43,325 |
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,998) | (130)
Fair Value, Less Than Twelve Months | 94,069 | 48,331
Gross Unrealized Losses, Total | (1,998) | (130)
Fair Value, Total | 94,069 | 48,331
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,380) |
Fair Value, Less Than Twelve Months | 57,940 |
Gross Unrealized Losses, Total | (1,380) |
Fair Value, Total | 57,940 |
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (525) | (10)
Fair Value, Less Than Twelve Months | 17,720 | 3,562
Gross Unrealized Losses, Total | (525) | (10)
Fair Value, Total | $ 17,720 | $ 3,562

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