Securities Available-for-Sale - Summary of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 282,273	$ 260,924
Gross Unrealized Gains	845	274
Gross Unrealized Losses	670	696
Total, Fair Value	282,448	260,502
SBA Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,328	54,331
Gross Unrealized Gains		23
Gross Unrealized Losses	289	143
Total, Fair Value	44,039	54,211
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	177,239	184,580
Gross Unrealized Gains	819	139
Gross Unrealized Losses	317	532
Total, Fair Value	177,741	184,187
Privately Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	330	397
Gross Unrealized Gains	2	1
Gross Unrealized Losses	4	2
Total, Fair Value	328	396
Obligations Issued by States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	52,276	18,016
Gross Unrealized Gains		60
Total, Fair Value	52,276	18,076
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,100	3,600
Gross Unrealized Gains	24	51
Gross Unrealized Losses	60	19
Total, Fair Value	$ 8,064	$ 3,632