LOANS AND THE ALLOWANCE FOR LOAN LOSSES - Allowance for loan losses by portfolio (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	$ 7,100	$ 6,982	$ 7,287	$ 6,478
Provision for (recovery of) credit losses	18	306	(169)	792
Recoveries		1		19
Ending balance	7,118	7,289	7,118	7,289
Individually evaluated	1,040		1,040		$ 6,565
Collectively evaluated	6,078		6,078		722
Loans individually evaluated	13,112		13,112		1,835
Loans collectively evaluated	843,045		843,045		810,862
Total Recorded Investment	856,157		856,157		812,697
Cash, Securities and Other
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	934	1,127	1,066	846
Provision for (recovery of) credit losses	(94)	3	(226)	282
Recoveries		1		3
Ending balance	840	1,131	840	1,131
Individually evaluated					1,066
Collectively evaluated	840		840
Loans individually evaluated	11,277		11,277
Loans collectively evaluated	121,643		121,643		131,756
Total Recorded Investment	132,920		132,920		131,756
Construction and Development
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	227	262	202	301
Provision for (recovery of) credit losses	12	37	37	(2)
Ending balance	239	299	239	299
Individually evaluated					202
Collectively evaluated	239		239
Loans collectively evaluated	37,423		37,423		24,914
Total Recorded Investment	37,423		37,423		24,914
1-4 Family Residential
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,957	2,270	2,283	1,833
Provision for (recovery of) credit losses	132	21	(194)	442
Recoveries				16
Ending balance	2,089	2,291	2,089	2,291
Individually evaluated					2,283
Collectively evaluated	2,089		2,089
Loans collectively evaluated	327,674		327,674		282,014
Total Recorded Investment	327,674		327,674		282,014
Non-Owner Occupied CRE
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	1,199	1,462	1,433	1,153
Provision for (recovery of) credit losses	11	82	(223)	391
Ending balance	1,210	1,544	1,210	1,544
Individually evaluated					1,433
Collectively evaluated	1,210		1,210
Loans collectively evaluated	165,670		165,670		176,987
Total Recorded Investment	165,670		165,670		176,987
Owner Occupied CRE
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	626	709	751	476
Provision for (recovery of) credit losses	(22)	93	(147)	326
Ending balance	604	802	604	802
Individually evaluated					751
Collectively evaluated	604		604
Loans collectively evaluated	94,698		94,698		92,742
Total Recorded Investment	94,698		94,698		92,742
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	2,157	1,152	1,552	1,869
Provision for (recovery of) credit losses	(21)	70	584	(647)
Ending balance	2,136	$ 1,222	2,136	$ 1,222
Individually evaluated	1,040		1,040		830
Collectively evaluated	1,096		1,096		722
Loans individually evaluated	1,835		1,835		1,835
Loans collectively evaluated	95,937		95,937		102,449
Total Recorded Investment	$ 97,772		$ 97,772		$ 104,284