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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	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	$ 6,601		$ 11,026
Loans, Collectively evaluated for impairment	1,078,340		998,986
Total Loans	1,084,941		1,010,012
Allowance for loan losses, Individually evaluated for impairment	39		51
Allowance for loan losses, Collectively evaluated for impairment	13,773		12,745
Allowance for loan losses, Total	13,812	$ 13,437	12,796	$ 12,771	$ 12,751	$ 12,775
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	127,011		115,663
Municipal
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	39,429		42,065
Installment and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	32,783		21,902
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	2,926		6,690
Loans, Collectively evaluated for impairment	735,963		674,935
Total Loans	738,889		681,625
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	9,436		8,710
Allowance for loan losses, Total	9,436		8,710
Commercial | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	2,416		5,848
Loans, Collectively evaluated for impairment	526,081		487,068
Total Loans	528,497		492,916
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	7,057		6,763
Allowance for loan losses, Total	7,057		6,763
Commercial | Acquisition and Development
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	201		492
Loans, Collectively evaluated for impairment	43,751		30,489
Total Loans	43,952		30,981
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	739		417
Allowance for loan losses, Total	739		417
Commercial | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	309		350
Loans, Collectively evaluated for impairment	126,702		115,313
Total Loans	127,011		115,663
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	1,561		1,446
Allowance for loan losses, Total	1,561		1,446
Commercial | Municipal
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	0		0
Loans, Collectively evaluated for impairment	39,429		42,065
Total Loans	39,429		42,065
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	79		84
Allowance for loan losses, Total	79		84
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	3,675		4,336
Loans, Collectively evaluated for impairment	342,377		324,051
Total Loans	346,052		328,387
Allowance for loan losses, Individually evaluated for impairment	39		51
Allowance for loan losses, Collectively evaluated for impairment	3,827		3,560
Allowance for loan losses, Total	3,866		3,611
Consumer | Residential Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	3,675		4,325
Loans, Collectively evaluated for impairment	309,594		302,160
Total Loans	313,269		306,485
Allowance for loan losses, Individually evaluated for impairment	39		42
Allowance for loan losses, Collectively evaluated for impairment	3,500		3,358
Allowance for loan losses, Total	3,539		3,400
Consumer | Installment and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	0		11
Loans, Collectively evaluated for impairment	32,783		21,891
Total Loans	32,783		21,902
Allowance for loan losses, Individually evaluated for impairment	0		9
Allowance for loan losses, Collectively evaluated for impairment	327		202
Allowance for loan losses, Total	327		211
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	510		475
Allowance for loan losses, Total	$ 510		$ 475

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