Securities Available-for-Sale - Summary of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 260,924	$ 336,751
Gross Unrealized Gains	274	635
Gross Unrealized Losses	696	627
Total, Fair Value	260,502	336,759
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,000
Gross Unrealized Losses		8
Total, Fair Value		1,992
U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3,946
Gross Unrealized Losses		31
Total, Fair Value		3,915
SBA Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,331	70,477
Gross Unrealized Gains	23	1
Gross Unrealized Losses	143	284
Total, Fair Value	54,211	70,194
U.S. Government Agency and Sponsored Enterprises Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	184,580	162,604
Gross Unrealized Gains	139	536
Gross Unrealized Losses	532	250
Total, Fair Value	184,187	162,890
Privately Issued Residential Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	397	679
Gross Unrealized Gains	1	3
Gross Unrealized Losses	2	10
Total, Fair Value	396	672
Obligations Issued by States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18,016	93,445
Gross Unrealized Gains	60	58
Total, Fair Value	18,076	93,503
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,600	3,600
Gross Unrealized Gains	51	37
Gross Unrealized Losses	19	44
Total, Fair Value	$ 3,632	$ 3,593