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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, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	$ 6,441		$ 7,973
Loans, Collectively evaluated for impairment	974,779		875,418
Total Loans	981,220		883,391
Allowance for loan losses, Individually evaluated for impairment	51		43
Allowance for loan losses, Collectively evaluated for impairment	12,720		12,732
Allowance for loan losses, Total	12,771	$ 12,751	12,775	$ 13,850	$ 13,440	$ 13,568
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	107,998		88,465
Municipal
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	50,533		53,741
Installment and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Loans	12,349		7,118
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	2,287		3,052
Loans, Collectively evaluated for impairment	668,356		598,769
Total Loans	670,643		601,821
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	8,723		9,238
Allowance for loan losses, Total	8,723		9,238
Commercial | Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	1,428		2,457
Loans, Collectively evaluated for impairment	476,251		426,410
Total Loans	477,679		428,867
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	6,675		7,530
Allowance for loan losses, Total	6,675		7,530
Commercial | Acquisition and Development
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	493		1
Loans, Collectively evaluated for impairment	33,940		30,747
Total Loans	34,433		30,748
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	490		580
Allowance for loan losses, Total	490		580
Commercial | Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	366		594
Loans, Collectively evaluated for impairment	107,632		87,871
Total Loans	107,998		88,465
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	1,453		1,074
Allowance for loan losses, Total	1,453		1,074
Commercial | Municipal
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	0		0
Loans, Collectively evaluated for impairment	50,533		53,741
Total Loans	50,533		53,741
Allowance for loan losses, Individually evaluated for impairment	0		0
Allowance for loan losses, Collectively evaluated for impairment	105		54
Allowance for loan losses, Total	105		54
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	4,154		4,921
Loans, Collectively evaluated for impairment	306,423		276,649
Total Loans	310,577		281,570
Allowance for loan losses, Individually evaluated for impairment	51		43
Allowance for loan losses, Collectively evaluated for impairment	3,476		3,080
Allowance for loan losses, Total	3,527		3,123
Consumer | Residential Mortgage
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	4,142		4,915
Loans, Collectively evaluated for impairment	294,086		269,537
Total Loans	298,228		274,452
Allowance for loan losses, Individually evaluated for impairment	42		43
Allowance for loan losses, Collectively evaluated for impairment	3,319		2,936
Allowance for loan losses, Total	3,361		2,979
Consumer | Installment and Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, Individually evaluated for impairment	12		6
Loans, Collectively evaluated for impairment	12,337		7,112
Total Loans	12,349		7,118
Allowance for loan losses, Individually evaluated for impairment	9		0
Allowance for loan losses, Collectively evaluated for impairment	157		144
Allowance for loan losses, Total	166		144
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	521		414
Allowance for loan losses, Total	$ 521		$ 414

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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