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Investment Securities - Summary of Amortized Cost and Fair Values of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	$ 104,617	$ 108,037
Available for sale, Gross Unrealized Gains	1,448	741
Available for sale, Gross Unrealized Losses	1,584	207
Available for sale, Fair Value	104,481	108,571
Held to maturity, Amortized Cost		12,192
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	12,150
Available for sale, Gross Unrealized Gains	115
Available for sale, Fair Value	12,265
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
Mortgage Backed Securities [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	80,713	94,983
Available for sale, Gross Unrealized Gains	1,254	654
Available for sale, Gross Unrealized Losses	1,366	152
Available for sale, Fair Value	80,601	95,485
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
Available for sale, Gross Unrealized Losses		51
Available for sale, Fair Value		2,449
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	11,754	10,554
Available for sale, Gross Unrealized Gains	79	87
Available for sale, Gross Unrealized Losses	218	4
Available for sale, Fair Value	$ 11,615	$ 10,637

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