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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, 2020	Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	$ 108,661	$ 108,037
Available for sale, Gross Unrealized Gains	1,423	741
Available for sale, Gross Unrealized Losses	609	207
Available for sale, Fair Value	109,475	108,571
Held to maturity, Amortized Cost		12,192
Held to maturity, Fair Value		12,654
Investment Securities, Amortized Cost		120,229
Investment Securities, Gross Unrealized Gains		1,205
Investment Securities, Gross Unrealized Losses		209
Investment Securities, Fair Value		121,225
State and Municipal [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	14,069
Available for sale, Gross Unrealized Gains	258
Available for sale, Gross Unrealized Losses	68
Available for sale, Fair Value	14,259
Held to maturity, Amortized Cost		12,192
Held to maturity, Gross Unrealized Gains		464
Held to maturity, Gross Unrealized Losses		2
Held to maturity, Fair Value		12,654
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	2,500
Available for sale, Gross Unrealized Losses	91	51
Available for sale, Fair Value	2,409	2,449
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	72,337	94,983
Available for sale, Gross Unrealized Gains	696	654
Available for sale, Gross Unrealized Losses	398	152
Available for sale, Fair Value	72,635	95,485
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	19,755	10,554
Available for sale, Gross Unrealized Gains	469	87
Available for sale, Gross Unrealized Losses	52	4
Available for sale, Fair Value	$ 20,172	$ 10,637

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