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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
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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