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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Allowance for loan losses:
Beginning balance			$ 14,651	$ 12,859	$ 12,859
Provision for loan losses	$ 100	$ 500	1,250	1,750	2,250
Loans charged-off			(232)	(411)	(918)
Recoveries			725	243	460
Ending balance	16,394	14,441	16,394	14,441	14,651
Allowance ending balance:
Individually evaluated for impairment	1,268	454	1,268	454	493
Collectively evaluated for impairment	15,126	13,987	15,126	13,987	14,158
Ending balance	16,394	14,441	16,394	14,441	14,651
Loans:
Individually evaluated for impairment	21,383	11,826	21,383	11,826	11,356
Collectively evaluated for impairment	1,715,056	1,640,037	1,715,056	1,640,037	1,648,179
Ending balance	1,736,439	1,651,863	1,736,439	1,651,863	1,659,535
Commercial and industrial
Allowance for loan losses:
Beginning balance			1,751	1,581	1,581
Provision for loan losses			(152)	138	426
Loans charged-off			(49)	(66)	(367)
Recoveries			507	54	111
Ending balance	2,057	1,707	2,057	1,707	1,751
Allowance ending balance:
Individually evaluated for impairment		315		315	64
Collectively evaluated for impairment	2,057	1,392	2,057	1,392	1,687
Ending balance	2,057	1,707	2,057	1,707	1,751
Loans:
Individually evaluated for impairment	302	1,584	302	1,584	1,022
Collectively evaluated for impairment	299,412	247,174	299,412	247,174	260,757
Ending balance	299,714	248,758	299,714	248,758	261,779
Construction and development
Allowance for loan losses:
Beginning balance			1,920	1,724	1,724
Provision for loan losses			215	119	196
Ending balance	2,135	1,843	2,135	1,843	1,920
Allowance ending balance:
Individually evaluated for impairment					4
Collectively evaluated for impairment	2,135	1,843	2,135	1,843	1,916
Ending balance	2,135	1,843	2,135	1,843	1,920
Loans:
Individually evaluated for impairment	1,325	1,684	1,325	1,684	1,250
Collectively evaluated for impairment	255,134	227,623	255,134	227,623	236,253
Ending balance	256,459	229,307	256,459	229,307	237,503
Commercial real estate
Allowance for loan losses:
Beginning balance			6,025	4,585	4,585
Provision for loan losses			863	1,329	1,472
Loans charged-off				(32)	(33)
Recoveries			1		1
Ending balance	6,889	5,882	6,889	5,882	6,025
Allowance ending balance:
Individually evaluated for impairment	1,186	61	1,186	61	341
Collectively evaluated for impairment	5,703	5,821	5,703	5,821	5,684
Ending balance	6,889	5,882	6,889	5,882	6,025
Loans:
Individually evaluated for impairment	17,222	6,360	17,222	6,360	7,153
Collectively evaluated for impairment	564,520	592,793	564,520	592,793	575,366
Ending balance	581,742	599,153	581,742	599,153	582,519
Farmland
Allowance for loan losses:
Beginning balance			643	523	523
Provision for loan losses			(49)	100	120
Ending balance	594	623	594	623	643
Allowance ending balance:
Individually evaluated for impairment	62	74	62	74	78
Collectively evaluated for impairment	532	549	532	549	565
Ending balance	594	623	594	623	643
Loans:
Individually evaluated for impairment	133	218	133	218	140
Collectively evaluated for impairment	60,940	64,991	60,940	64,991	67,705
Ending balance	61,073	65,209	61,073	65,209	67,845
1-4 family residential
Allowance for loan losses:
Beginning balance			2,868	3,022	3,022
Provision for loan losses			220	(161)	(196)
Loans charged-off			(14)	(19)	(93)
Recoveries			3	49	135
Ending balance	3,077	2,891	3,077	2,891	2,868
Allowance ending balance:
Individually evaluated for impairment	20	4	20	4	6
Collectively evaluated for impairment	3,057	2,887	3,057	2,887	2,862
Ending balance	3,077	2,891	3,077	2,891	2,868
Loans:
Individually evaluated for impairment	2,337	1,571	2,337	1,571	1,383
Collectively evaluated for impairment	404,543	390,885	404,543	390,885	391,684
Ending balance	406,880	392,456	406,880	392,456	393,067
Multi-family residential
Allowance for loan losses:
Beginning balance			631	629	629
Provision for loan losses			199	41	2
Ending balance	830	670	830	670	631
Allowance ending balance:
Collectively evaluated for impairment	830	670	830	670	631
Ending balance	830	670	830	670	631
Loans:
Collectively evaluated for impairment	58,198	38,523	58,198	38,523	38,386
Ending balance	58,198	38,523	58,198	38,523	38,386
Consumer
Allowance for loan losses:
Beginning balance			565	602	602
Provision for loan losses			(28)	101	127
Loans charged-off			(32)	(175)	(254)
Recoveries			95	41	90
Ending balance	600	569	600	569	565
Allowance ending balance:
Collectively evaluated for impairment	600	569	600	569	565
Ending balance	600	569	600	569	565
Loans:
Collectively evaluated for impairment	53,315	53,947	53,315	53,947	54,777
Ending balance	53,315	53,947	53,315	53,947	54,777
Agricultural
Allowance for loan losses:
Beginning balance			238	187	187
Provision for loan losses			(126)	(3)	(12)
Loans charged-off				(2)	(2)
Recoveries			89	65	65
Ending balance	201	247	201	247	238
Allowance ending balance:
Collectively evaluated for impairment	201	247	201	247	238
Ending balance	201	247	201	247	238
Loans:
Individually evaluated for impairment	64	409	64	409	408
Collectively evaluated for impairment	18,664	23,775	18,664	23,775	22,869
Ending balance	18,728	24,184	18,728	24,184	23,277
Overdrafts
Allowance for loan losses:
Beginning balance			10	6	6
Provision for loan losses			108	86	115
Loans charged-off			(137)	(117)	(169)
Recoveries			30	34	58
Ending balance	11	9	11	9	10
Allowance ending balance:
Collectively evaluated for impairment	11	9	11	9	10
Ending balance	11	9	11	9	10
Loans:
Collectively evaluated for impairment	330	326	330	326	382
Ending balance	$ 330	$ 326	$ 330	$ 326	$ 382