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Investments - Summary of Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Investment securities, Amortized Cost | $ 362,373 | $ 108,661
Investment securities, Gross Unrealized Gains | 1,714 | 1,423
Investment securities, Gross Unrealized Losses | (3,989) | (609)
Investment securities, Fair Value | 360,098 | 109,475
State and Municipal [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 41,843 | 14,069
Available for sale, Gross Unrealized Gains | 289 | 258
Available for sale, Gross Unrealized Losses | (280) | (68)
Available for sale, Fair Value | 41,852 | 14,259
U.S. Treasury and Agencies [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 49,212 | 2,500
Available for sale, Gross Unrealized Losses | (664) | (91)
Available for sale, Fair Value | 48,548 | 2,409
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 241,108 | 72,337
Available for sale, Gross Unrealized Gains | 617 | 696
Available for sale, Gross Unrealized Losses | (2,802) | (398)
Available for sale, Fair Value | 238,923 | 72,635
Corporate Bonds [Member] |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |
Available for sale, Amortized Cost | 30,210 | 19,755
Available for sale, Gross Unrealized Gains | 808 | 469
Available for sale, Gross Unrealized Losses | (243) | (52)
Available for sale, Fair Value | $ 30,775 | $ 20,172

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