Loans and Allowance For Loan Losses - Summary of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	$ 14,577	$ 11,565	$ 14,111	$ 11,075
Provision for loan losses	(1,100)	2,930	(800)	3,330
Charge-offs	(278)	(1,976)	(278)	(1,976)
Recoveries	41	5	207	95
Ending balance	13,240	12,524	13,240	12,524
Commercial And Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	9,231	7,843	8,923	6,708
Provision for loan losses	(1,139)	1,871	(997)	2,916
Charge-offs		(1,868)		(1,868)
Recoveries	41	5	207	95
Ending balance	8,133	7,851	8,133	7,851
Real Estate, Other [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	3,957	2,661	3,877	3,281
Provision for loan losses	112	671	192	51
Ending balance	4,069	3,332	4,069	3,332
Real Estate Construction And Land [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	798	730	681	1,022
Provision for loan losses	(101)	226	16	(66)
Ending balance	697	956	697	956
SBA [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	575	321	604	50
Provision for loan losses	20	153	(9)	424
Charge-offs	(278)	(108)	(278)	(108)
Ending balance	317	366	317	366
Other Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Beginning balance	16	10	26	14
Provision for loan losses	8	9	(2)	5
Ending balance	$ 24	$ 19	$ 24	$ 19