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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, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Loans allocated by:
Individually evaluated for impairment	$ 6,297	$ 11,026
Collectively evaluated for impairment	1,241,360	998,986
Total Loans	1,247,657	1,010,012
Allowance for loan losses allocated by:
Individually evaluated for impairment	38	51
Collectively evaluated for impairment	13,976	12,745
Allowance for loan losses, Total	14,014	12,796	$ 12,775	$ 13,568
Commercial
Loans allocated by:
Individually evaluated for impairment	2,606	6,690
Collectively evaluated for impairment	820,520	674,935
Total Loans	823,126	681,625
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	9,447	8,710
Allowance for loan losses, Total	9,447	8,710
Consumer
Loans allocated by:
Individually evaluated for impairment	3,691	4,336
Collectively evaluated for impairment	420,840	324,051
Total Loans	424,531	328,387
Allowance for loan losses allocated by:
Individually evaluated for impairment	38	51
Collectively evaluated for impairment	3,959	3,560
Allowance for loan losses, Total	3,997	3,611
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	570	475
Allowance for loan losses, Total	570	475
Commercial Real Estate | Commercial
Loans allocated by:
Individually evaluated for impairment	2,320	5,848
Collectively evaluated for impairment	559,424	487,068
Total Loans	561,744	492,916
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	6,876	6,763
Allowance for loan losses, Total	6,876	6,763
Acquisition and Development | Commercial
Loans allocated by:
Individually evaluated for impairment	0	492
Collectively evaluated for impairment	49,436	30,489
Total Loans	49,436	30,981
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	817	417
Allowance for loan losses, Total	817	417
Commercial and Industrial
Loans allocated by:
Total Loans	160,964	115,663
Commercial and Industrial | Commercial
Loans allocated by:
Individually evaluated for impairment	286	350
Collectively evaluated for impairment	160,678	115,313
Total Loans	160,964	115,663
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	1,656	1,446
Allowance for loan losses, Total	1,656	1,446
Municipal
Loans allocated by:
Total Loans	50,982	42,065
Municipal | Commercial
Loans allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	50,982	42,065
Total Loans	50,982	42,065
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	0
Collectively evaluated for impairment	98	84
Allowance for loan losses, Total	98	84
Residential Mortgage | Consumer
Loans allocated by:
Individually evaluated for impairment	3,691	4,325
Collectively evaluated for impairment	387,429	302,160
Total Loans	391,120	306,485
Allowance for loan losses allocated by:
Individually evaluated for impairment	38	42
Collectively evaluated for impairment	3,715	3,358
Allowance for loan losses, Total	3,753	3,400
Installment and other loans
Loans allocated by:
Total Loans	33,411	21,902
Installment and other loans | Consumer
Loans allocated by:
Individually evaluated for impairment	0	11
Collectively evaluated for impairment	33,411	21,891
Total Loans	33,411	21,902
Allowance for loan losses allocated by:
Individually evaluated for impairment	0	9
Collectively evaluated for impairment	244	202
Allowance for loan losses, Total	$ 244	$ 211

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