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Investment Securities - Summary of Amortized Cost and Fair Values of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	$ 113,485	$ 108,037
Available for sale, Gross Unrealized Gains	1,173	741
Available for sale, Gross Unrealized Losses	769	207
Available for sale, Fair Value	113,889	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	13,792
Available for sale, Gross Unrealized Gains	240
Available for sale, Gross Unrealized Losses	21
Available for sale, Fair Value	14,011
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	79,263	94,983
Available for sale, Gross Unrealized Gains	836	654
Available for sale, Gross Unrealized Losses	608	152
Available for sale, Fair Value	79,491	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	2,500
Available for sale, Gross Unrealized Losses	34	51
Available for sale, Fair Value	2,466	2,449
Corporate Bonds [Member]
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]
Available for sale, Amortized Cost	17,930	10,554
Available for sale, Gross Unrealized Gains	97	87
Available for sale, Gross Unrealized Losses	106	4
Available for sale, Fair Value	$ 17,921	$ 10,637

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