LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Loan Losses Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	$ 16,202	$ 14,651	$ 12,859
Impact of adopting ASC 326	4,548
Provision for credit losses and Loans losses	13,200	1,250	2,250
Loans charged-off	(543)	(453)	(918)
Recoveries	212	754	460
Ending balance	33,619	16,202	14,651
Commercial and industrial
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	2,056	1,751	1,581
Impact of adopting ASC 326	546
Provision for credit losses and Loans losses	1,398	(117)	426
Loans charged-off	(68)	(86)	(367)
Recoveries	101	508	111
Ending balance	4,033	2,056	1,751
Construction and development
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	2,378	1,920	1,724
Impact of adopting ASC 326	323
Provision for credit losses and Loans losses	2,034	458	196
Ending balance	4,735	2,378	1,920
Commercial real estate
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	6,853	6,025	4,585
Impact of adopting ASC 326	2,228
Provision for credit losses and Loans losses	6,698	827	1,472
Loans charged-off			(33)
Recoveries	1	1	1
Ending balance	15,780	6,853	6,025
Farmland
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	570	643	523
Impact of adopting ASC 326	26
Provision for credit losses and Loans losses	624	(73)	120
Ending balance	1,220	570	643
1-4 family residential
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	3,125	2,868	3,022
Impact of adopting ASC 326	1,339
Provision for credit losses and Loans losses	1,915	268	(196)
Loans charged-off	(68)	(14)	(93)
Recoveries	2	3	135
Ending balance	6,313	3,125	2,868
Multi-family residential
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	409	631	629
Impact of adopting ASC 326	(50)
Provision for credit losses and Loans losses	4	(222)	2
Ending balance	363	409	631
Consumer
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	602	565	602
Impact of adopting ASC 326	72
Provision for credit losses and Loans losses	373	(2)	127
Loans charged-off	(155)	(72)	(254)
Recoveries	37	111	90
Ending balance	929	602	565
Agricultural
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	197	238	187
Impact of adopting ASC 326	73
Provision for credit losses and Loans losses	(33)	(41)	(12)
Loans charged-off	(18)	(89)	(2)
Recoveries	20	89	65
Ending balance	239	197	238
Overdrafts
Allowance for credit losses:
Beginning balance, prior to adoption of ASC 326	12	10	6
Impact of adopting ASC 326	(9)
Provision for credit losses and Loans losses	187	152	115
Loans charged-off	(234)	(192)	(169)
Recoveries	51	42	58
Ending balance	$ 7	$ 12	$ 10