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Investments - Summary of Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Investment securities, Amortized Cost | $ 281,062 | $ 108,661
Investment securities, Gross Unrealized Gains | 1,419 | 1,423
Investment securities, Gross Unrealized Losses | (3,747) | (609)
Investment securities, Fair Value | 278,734 | 109,475
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 159,239 | 72,337
Available for sale, Gross Unrealized Gains | 440 | 696
Available for sale, Gross Unrealized Losses | (2,552) | (398)
Available for sale, Fair Value | 157,127 | 72,635
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 54,477 | 2,500
Available for sale, Gross Unrealized Gains | 56 |
Available for sale, Gross Unrealized Losses | (807) | (91)
Available for sale, Fair Value | 53,726 | 2,409
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 35,716 | 19,755
Available for sale, Gross Unrealized Gains | 738 | 469
Available for sale, Gross Unrealized Losses | (49) | (52)
Available for sale, Fair Value | 36,405 | 20,172
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 31,630 | 14,069
Available for sale, Gross Unrealized Gains | 185 | 258
Available for sale, Gross Unrealized Losses | (339) | (68)
Available for sale, Fair Value | $ 31,476 | $ 14,259

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