LOANS AND ALLOWANCE FOR LOAN LOSSES - Schedule of Allowance for Loan Losses Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Allowance for loan losses:
Beginning balance			$ 11,484	$ 9,263	$ 9,263
Provision for loan losses	$ 800	$ 840	2,250	3,240	3,640
Loans charged-off			(1,479)	(1,519)	(1,762)
Recoveries			273	182	343
Ending balance	12,528	11,166	12,528	11,166	11,484
Allowance ending balance:
Individually evaluated for impairment						$ 520	$ 253	$ 298
Collectively evaluated for impairment						12,008	11,231	10,868
Ending balance	12,528	11,166	11,484	9,263	9,263	12,528	11,484	11,166
Loans:
Individually evaluated for impairment						6,680	6,318	4,663
Collectively evaluated for impairment						1,300,695	1,238,817	1,224,678
Ending balance						1,307,375	1,245,135	1,229,341
Commercial and industrial
Allowance for loan losses:
Beginning balance			1,592	1,878	1,878
Provision for loan losses			602	949	910
Loans charged-off			(737)	(1,196)	(1,213)
Recoveries			116	14	17
Ending balance	1,573	1,645	1,573	1,645	1,592
Allowance ending balance:
Individually evaluated for impairment						19	64	139
Collectively evaluated for impairment						1,554	1,528	1,506
Ending balance	1,573	1,645	1,592	1,878	1,878	1,573	1,592	1,645
Loans:
Individually evaluated for impairment						354	231	236
Collectively evaluated for impairment						192,309	223,766	224,381
Ending balance						192,663	223,997	224,617
Construction and development
Allowance for loan losses:
Beginning balance			1,161	1,004	1,004
Provision for loan losses			762	134	162
Loans charged-off			0	(9)	(9)
Recoveries			0	4	4
Ending balance	1,923	1,133	1,923	1,133	1,161
Allowance ending balance:
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						1,923	1,161	1,133
Ending balance	1,923	1,133	1,161	1,004	1,004	1,923	1,161	1,133
Loans:
Individually evaluated for impairment						0	1,825	0
Collectively evaluated for impairment						201,067	127,541	125,045
Ending balance						201,067	129,366	125,045
Commercial real estate
Allowance for loan losses:
Beginning balance			3,264	2,106	2,106
Provision for loan losses			1,019	993	1,158
Loans charged-off			(84)	0	0
Recoveries			0	0	0
Ending balance	4,199	3,099	4,199	3,099	3,264
Allowance ending balance:
Individually evaluated for impairment						31	0	0
Collectively evaluated for impairment						4,168	3,264	3,099
Ending balance	4,199	3,099	3,264	2,106	2,106	4,199	3,264	3,099
Loans:
Individually evaluated for impairment						4,029	1,196	1,464
Collectively evaluated for impairment						389,285	366,460	359,212
Ending balance						393,314	367,656	360,676
Farmland
Allowance for loan losses:
Beginning balance			482	400	400
Provision for loan losses			(24)	74	82
Loans charged-off			0	0	0
Recoveries			0	0	0
Ending balance	458	474	458	474	482
Allowance ending balance:
Individually evaluated for impairment						85	47	47
Collectively evaluated for impairment						373	435	427
Ending balance	458	474	482	400	400	458	482	474
Loans:
Individually evaluated for impairment						276	258	259
Collectively evaluated for impairment						54,073	62,104	61,643
Ending balance						54,349	62,362	61,902
1-4 family residential
Allowance for loan losses:
Beginning balance			3,960	2,839	2,839
Provision for loan losses			(585)	916	1,117
Loans charged-off			(307)	(25)	(71)
Recoveries			21	0	75
Ending balance	3,089	3,730	3,089	3,730	3,960
Allowance ending balance:
Individually evaluated for impairment						145	108	82
Collectively evaluated for impairment						2,944	3,852	3,648
Ending balance	3,089	3,730	3,960	2,839	2,839	3,089	3,960	3,730
Loans:
Individually evaluated for impairment						1,097	2,588	2,177
Collectively evaluated for impairment						364,792	360,364	346,224
Ending balance						365,889	362,952	348,401
Multi-family residential
Allowance for loan losses:
Beginning balance			281	325	325
Provision for loan losses			(15)	46	(44)
Loans charged-off			0	0	0
Recoveries			0	0	0
Ending balance	266	371	266	371	281
Allowance ending balance:
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						266	281	371
Ending balance	266	371	281	325	325	266	281	371
Loans:
Individually evaluated for impairment						228	5	0
Collectively evaluated for impairment						23,007	26,074	34,538
Ending balance						23,235	26,079	34,538
Consumer
Allowance for loan losses:
Beginning balance			585	562	562
Provision for loan losses			149	74	171
Loans charged-off			(230)	(170)	(269)
Recoveries			95	103	121
Ending balance	599	569	599	569	585
Allowance ending balance:
Individually evaluated for impairment						0	34	29
Collectively evaluated for impairment						599	551	540
Ending balance	599	569	585	562	562	599	585	569
Loans:
Individually evaluated for impairment						0	200	208
Collectively evaluated for impairment						51,711	53,305	54,137
Ending balance						51,711	53,505	54,345
Agricultural
Allowance for loan losses:
Beginning balance			153	138	138
Provision for loan losses			258	(10)	15
Loans charged-off			(4)	0	0
Recoveries			0	0	0
Ending balance	407	128	407	128	153
Allowance ending balance:
Individually evaluated for impairment						240	0	1
Collectively evaluated for impairment						167	153	127
Ending balance	407	128	153	138	138	407	153	128
Loans:
Individually evaluated for impairment						696	15	319
Collectively evaluated for impairment						23,753	18,886	18,904
Ending balance						24,449	18,901	19,223
Overdrafts
Allowance for loan losses:
Beginning balance			6	11	11
Provision for loan losses			84	64	69
Loans charged-off			(117)	(119)	(200)
Recoveries			41	61	126
Ending balance	14	17	14	17	6
Allowance ending balance:
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						14	6	17
Ending balance	$ 14	$ 17	$ 6	$ 11	$ 11	14	6	17
Loans:
Individually evaluated for impairment						0	0	0
Collectively evaluated for impairment						698	317	594
Ending balance						$ 698	$ 317	$ 594