LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Loan Losses Activity (Details) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Allowance for credit losses:
Beginning balance	$ 16,202	$ 14,651	$ 14,651
Impact of adopting ASC 326	4,548
Provision for credit losses and Loans losses	13,200	1,250	1,250
Loans charged-off	(384)	(232)	(453)
Recoveries	191	725	754
Ending balance	33,757	16,394	16,202
Commercial and industrial
Allowance for credit losses:
Beginning balance	2,056	1,751	1,751
Impact of adopting ASC 326	546
Provision for credit losses and Loans losses	1,366	(152)	(117)
Loans charged-off	(43)	(49)	(86)
Recoveries	93	507	508
Ending balance	4,018	2,057	2,056
Construction and development
Allowance for credit losses:
Beginning balance	2,378	1,920	1,920
Impact of adopting ASC 326	323
Provision for credit losses and Loans losses	2,228	215	458
Ending balance	4,929	2,135	2,378
Commercial real estate
Allowance for credit losses:
Beginning balance	6,853	6,025	6,025
Impact of adopting ASC 326	2,228
Provision for credit losses and Loans losses	6,613	863	827
Recoveries	1	1	1
Ending balance	15,695	6,889	6,853
Farmland
Allowance for credit losses:
Beginning balance	570	643	643
Impact of adopting ASC 326	26
Provision for credit losses and Loans losses	694	(49)	(73)
Ending balance	1,290	594	570
1-4 family residential
Allowance for credit losses:
Beginning balance	3,125	2,868	2,868
Impact of adopting ASC 326	1,339
Provision for credit losses and Loans losses	1,778	220	268
Loans charged-off	(59)	(14)	(14)
Recoveries	2	3	3
Ending balance	6,185	3,077	3,125
Multi-family residential
Allowance for credit losses:
Beginning balance	409	631	631
Impact of adopting ASC 326	(50)
Provision for credit losses and Loans losses	(34)	199	(222)
Ending balance	325	830	409
Consumer
Allowance for credit losses:
Beginning balance	602	565	565
Impact of adopting ASC 326	72
Provision for credit losses and Loans losses	407	(28)	(2)
Loans charged-off	(136)	(32)	(72)
Recoveries	30	95	111
Ending balance	975	600	602
Agricultural
Allowance for credit losses:
Beginning balance	197	238	238
Impact of adopting ASC 326	73
Provision for credit losses and Loans losses	59	(126)	(41)
Loans charged-off	(18)		(89)
Recoveries	20	89	89
Ending balance	331	201	197
Overdrafts
Allowance for credit losses:
Beginning balance	12	10	10
Impact of adopting ASC 326	(9)
Provision for credit losses and Loans losses	89	108	152
Loans charged-off	(128)	(137)	(192)
Recoveries	45	30	42
Ending balance	$ 9	$ 11	$ 12