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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Ending Loan Balance Individually Evaluated for Impairment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loans allocated by:
Individually evaluated for impairment	$ 11,244	$ 11,636
Collectively evaluated for impairment	1,968,446	1,632,694
Total Loans	1,979,690	1,644,330
Allowance for loan losses allocated by:
Individually evaluated for impairment	34	36
Collectively evaluated for impairment	20,117	14,619
Allowance for loan losses, Total	20,151	14,655	$ 14,014	$ 12,796
Commercial and Industrial
Loans allocated by:
Total Loans	647,368	214,554
Municipal
Loans allocated by:
Total Loans	20,523	47,057
Installment and other loans
Loans allocated by:
Total Loans	26,361	50,735
Commercial
Loans allocated by:
Individually evaluated for impairment	7,981	8,215
Collectively evaluated for impairment	1,533,837	1,069,664
Total Loans	1,541,818	1,077,879
Allowance for loan losses allocated by:
Individually evaluated for impairment	1	0
Collectively evaluated for impairment	16,246	11,049
Allowance for loan losses, Total	16,247	11,049
Commercial | Commercial Real Estate
Loans allocated by:
Individually evaluated for impairment	3,528	6,452
Collectively evaluated for impairment	809,087	752,413
Total Loans	812,615	758,865
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	11,151	7,634
Allowance for loan losses, Total	11,151	7,634
Commercial | Acquisition and Development
Loans allocated by:
Individually evaluated for impairment	814	0
Collectively evaluated for impairment	60,498	57,403
Total Loans	61,312	57,403
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,114	959
Allowance for loan losses, Total	1,114	959
Commercial | Commercial and Industrial
Loans allocated by:
Individually evaluated for impairment	3,639	1,763
Collectively evaluated for impairment	643,729	212,791
Total Loans	647,368	214,554
Allowance for loan losses allocated by:
Individually evaluated for impairment	1	0
Collectively evaluated for impairment	3,941	2,356
Allowance for loan losses, Total	3,942	2,356
Commercial | Municipal
Loans allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	20,523	47,057
Total Loans	20,523	47,057
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	40	100
Allowance for loan losses, Total	40	100
Consumer
Loans allocated by:
Individually evaluated for impairment	3,263	3,421
Collectively evaluated for impairment	434,609	563,030
Total Loans	437,872	566,451
Allowance for loan losses allocated by:
Individually evaluated for impairment	33	36
Collectively evaluated for impairment	3,653	3,430
Allowance for loan losses, Total	3,686	3,466
Consumer | Residential Mortgage
Loans allocated by:
Individually evaluated for impairment	3,246	3,336
Collectively evaluated for impairment	408,265	512,380
Total Loans	411,511	515,716
Allowance for loan losses allocated by:
Individually evaluated for impairment	33	36
Collectively evaluated for impairment	3,329	3,111
Allowance for loan losses, Total	3,362	3,147
Consumer | Installment and other loans
Loans allocated by:
Individually evaluated for impairment	17	85
Collectively evaluated for impairment	26,344	50,650
Total Loans	26,361	50,735
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	324	319
Allowance for loan losses, Total	324	319
Unallocated
Loans allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	0	0
Total Loans	0	0
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	218	140
Allowance for loan losses, Total	$ 218	$ 140

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