LOANS AND ALLOWANCE FOR CREDIT LOSSES - Schedule of Allowance for Loan Losses Activity (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 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	487	575	1,250
Provision for credit losses - COVID-19	913
Loans charged-off	(224)	(78)	(453)
Recoveries	22	42	754
Ending balance	21,948	15,190	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	365	213	(117)
Loans charged-off	(43)	(6)	(86)
Recoveries		5	508
Ending balance	2,924	1,963	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	(229)	81	458
Provision for credit losses - COVID-19	106
Ending balance	2,578	2,001	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	447	269	827
Provision for credit losses - COVID-19	233
Recoveries			1
Ending balance	9,761	6,294	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	193	16	(73)
Provision for credit losses - COVID-19	3
Ending balance	792	659	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	(250)	7	268
Loans charged-off	(59)	(6)	(14)
Recoveries	1	1	3
Ending balance	4,156	2,870	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	(170)	(56)	(222)
Ending balance	189	575	409
Consumer
Allowance for credit losses:
Beginning balance	602	565	565
Impact of adopting ASC 326	72
Provision for credit losses and Loans losses	85	46	(2)
Loans charged-off	(73)	(17)	(72)
Recoveries	7	23	111
Ending balance	693	617	602
Agricultural
Allowance for credit losses:
Beginning balance	197	238	238
Impact of adopting ASC 326	73
Provision for credit losses and Loans losses	11	(35)	(41)
Loans charged-off			(89)
Recoveries			89
Ending balance	281	203	197
Overdrafts
Allowance for credit losses:
Beginning balance	12	10	10
Impact of adopting ASC 326	(9)
Provision for credit losses and Loans losses	35	34	152
Loans charged-off	(49)	(49)	(192)
Recoveries	14	13	42
Ending balance	3	$ 8	$ 12
Unallocated COVID-19 reserve
Allowance for credit losses:
Provision for credit losses - COVID-19	571
Ending balance	$ 571