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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Ending Loan Balances Evaluated for Impairment and Related Allowance for Loan Losses Allocation (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	$ 5,859	$ 6,297
Loans, Collectively evaluated for impairment	1,259,680	1,241,360
Total Loans	1,265,539	1,247,657
Allowance for loan losses, Individually evaluated for impairment	35	38
Allowance for loan losses, Collectively evaluated for impairment	14,248	13,976
Allowance for loan losses, Total	14,283	14,014	$ 13,000	$ 12,796
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	169,651	160,964
Municipal
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	50,599	50,982
Installment and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	30,475	33,411
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	2,485	2,606
Loans, Collectively evaluated for impairment	846,200	820,520
Total Loans	848,685	823,126
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	9,906	9,447
Allowance for loan losses, Total	9,906	9,447
Commercial | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	2,219	2,320
Loans, Collectively evaluated for impairment	570,071	559,424
Total Loans	572,290	561,744
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	7,025	6,876
Allowance for loan losses, Total	7,025	6,876
Commercial | Acquisition and Development
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	0	0
Loans, Collectively evaluated for impairment	56,145	49,436
Total Loans	56,145	49,436
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	969	817
Allowance for loan losses, Total	969	817
Commercial | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	266	286
Loans, Collectively evaluated for impairment	169,385	160,678
Total Loans	169,651	160,964
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	1,814	1,656
Allowance for loan losses, Total	1,814	1,656
Commercial | Municipal
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	0	0
Loans, Collectively evaluated for impairment	50,599	50,982
Total Loans	50,599	50,982
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	98	98
Allowance for loan losses, Total	98	98
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	3,374	3,691
Loans, Collectively evaluated for impairment	413,480	420,840
Total Loans	416,854	424,531
Allowance for loan losses, Individually evaluated for impairment	35	38
Allowance for loan losses, Collectively evaluated for impairment	3,947	3,959
Allowance for loan losses, Total	3,982	3,997
Consumer | Residential Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	3,364	3,691
Loans, Collectively evaluated for impairment	383,015	387,429
Total Loans	386,379	391,120
Allowance for loan losses, Individually evaluated for impairment	35	38
Allowance for loan losses, Collectively evaluated for impairment	3,730	3,715
Allowance for loan losses, Total	3,765	3,753
Consumer | Installment and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	10	0
Loans, Collectively evaluated for impairment	30,465	33,411
Total Loans	30,475	33,411
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	217	244
Allowance for loan losses, Total	217	244
Unallocated
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	0	0
Loans, Collectively evaluated for impairment	0	0
Total Loans	0	0
Allowance for loan losses, Individually evaluated for impairment	0	0
Allowance for loan losses, Collectively evaluated for impairment	395	570
Allowance for loan losses, Total	$ 395	$ 570

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