LOANS HELD FOR INVESTMENT, Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
LOANS HELD FOR INVESTMENT [Abstract]
Ratio of allowance for loan losses to loans held for investment	1.62%		1.73%
Allowance for Loan Losses [Roll Forward]
Beginning Balance	$ 42,098	$ 45,553
Provision for loan losses	(2,085)	89
Charge-offs	(657)	(841)
Recoveries	293	218
Ending Balance	39,649	45,019
Commercial Real Estate [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	17,245	18,962
Provision for loan losses	(2,649)	58
Charge-offs	0	0
Recoveries	25	0
Ending Balance	14,621	19,020
Commercial [Member] | Specialized [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	4,363	5,760
Provision for loan losses	(1,083)	(378)
Charge-offs	(39)	0
Recoveries	34	76
Ending Balance	3,275	5,458
Commercial [Member] | General [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	8,466	9,227
Provision for loan losses	1,659	52
Charge-offs	(307)	(344)
Recoveries	122	44
Ending Balance	9,940	8,979
Consumer [Member] | 1-4 Family Residential [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	5,268	4,646
Provision for loan losses	(298)	295
Charge-offs	(40)	(52)
Recoveries	1	1
Ending Balance	4,931	4,890
Consumer [Member] | Auto Loans [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	3,653	4,226
Provision for loan losses	68	(180)
Charge-offs	(86)	(188)
Recoveries	46	33
Ending Balance	3,681	3,891
Consumer [Member] | Other Consumer [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	1,357	1,671
Provision for loan losses	147	4
Charge-offs	(185)	(257)
Recoveries	65	62
Ending Balance	1,384	1,480
Construction [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	1,746	1,061
Provision for loan losses	71	238
Charge-offs	0	0
Recoveries	0	2
Ending Balance	$ 1,817	$ 1,301