LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Aging analysis of recorded investments by class(Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 6,113	$ 7,986
Total current	835,376	804,711
Total Recorded Investment	841,489	812,697
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,883	3,664
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	178	99
90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,052	4,223
Cash, Securities and Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,410	149
Total current	133,983	131,607
Total Recorded Investment	135,393	131,756
Cash, Securities and Other | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,407	50
Cash, Securities and Other | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3	99
Construction and Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	175
Total current	35,585	24,914
Total Recorded Investment	35,760	24,914
Construction and Development | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	175
1-4 Family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,405	3,638
Total current	305,389	278,376
Total Recorded Investment	$ 307,794	$ 282,014
Number of loans, 90 days delinquent and accruing interest | loan	1	1
90 days past due and accruing interest	$ 1,200	$ 1,200
1-4 Family Residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,188	1,250
1-4 Family Residential | 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,217	2,388
Non-Owner Occupied CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	288	750
Total current	164,150	176,237
Total Recorded Investment	164,438	176,987
Non-Owner Occupied CRE | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	288	750
Owner Occupied CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total current	98,393	92,742
Total Recorded Investment	98,393	92,742
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,835	3,449
Total current	97,876	100,835
Total Recorded Investment	99,711	104,284
Commercial and Industrial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		1,614
Commercial and Industrial | 90 or More Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 1,835	$ 1,835