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Investment Securities and Other Investments - Summary of Amortized Cost and Fair Values of Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	$ 108,037	$ 38,828
Available for sale, Gross Unrealized Gains	741	103
Available for sale, Gross Unrealized Losses	207	884
Available for sale, Fair Value	108,571	38,047
Held to maturity, Amortized Cost	12,192	15,565
Held to maturity, Fair Value	12,654	15,503
Investment Securities, Amortized Cost	120,229	54,393
Investment Securities, Gross Unrealized Gains	1,205	181
Investment Securities, Gross Unrealized Losses	209	1,024
Investment Securities, Fair Value	121,225	53,550
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost		1,000
Available for sale, Gross Unrealized Gains		3
Available for sale, Fair Value		1,003
Held to maturity, Amortized Cost	12,192	15,565
Held to maturity, Gross Unrealized Gains	464	78
Held to maturity, Gross Unrealized Losses	2	140
Held to maturity, Fair Value	12,654	15,503
U.S. Treasury and Agencies [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	2,500	3,375
Available for sale, Gross Unrealized Losses	51	208
Available for sale, Fair Value	2,449	3,167
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	94,983	28,976
Available for sale, Gross Unrealized Gains	654	22
Available for sale, Gross Unrealized Losses	152	628
Available for sale, Fair Value	95,485	28,370
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	10,554	5,477
Available for sale, Gross Unrealized Gains	87	78
Available for sale, Gross Unrealized Losses	4	48
Available for sale, Fair Value	$ 10,637	$ 5,507

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