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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (3,736) | $ (140)
Fair Value, Less Than Twelve Months | 244,115 | 51,893
Gross Unrealized Losses, Total | (3,736) | (140)
Fair Value, Total | 244,115 | 51,893
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (630) |
Fair Value, Less Than Twelve Months | 53,192 |
Gross Unrealized Losses, Total | (630) |
Fair Value, Total | 53,192 |
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,832) | (130)
Fair Value, Less Than Twelve Months | 104,211 | 48,331
Gross Unrealized Losses, Total | (1,832) | (130)
Fair Value, Total | 104,211 | 48,331
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1,075) |
Fair Value, Less Than Twelve Months | 72,504 |
Gross Unrealized Losses, Total | (1,075) |
Fair Value, Total | 72,504 |
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (199) | (10)
Fair Value, Less Than Twelve Months | 14,208 | 3,562
Gross Unrealized Losses, Total | (199) | (10)
Fair Value, Total | $ 14,208 | $ 3,562

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