LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Activity in allowance for credit losses) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 29,941	$ 25,068	$ 25,068
Provision for Credit Losses	882	3,260
Charge-Offs	(2,563)	(2,650)
Recoveries	1,069	1,130
Net (Charge-Offs) Recoveries	(1,494)	(1,520)
Ending Balance	29,329	26,808	29,941
Commercial, Financial and Agricultural [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	1,482	1,506	1,506
Provision for Credit Losses	284	78
Charge-Offs	(282)	(164)	(511)
Recoveries	41	95
Net (Charge-Offs) Recoveries	(241)	(69)
Ending Balance	1,525	1,515	1,482
Real Estate - Construction [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,502	2,654	2,654
Provision for Credit Losses	(633)	704
Charge-Offs	0	0
Recoveries	0	1
Net (Charge-Offs) Recoveries	0	1
Ending Balance	1,869	3,359	2,502
Real Estate - Commercial Mortgage [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	5,782	4,815	4,815
Provision for Credit Losses	(39)	7
Charge-Offs	0	(120)	(120)
Recoveries	204	8
Net (Charge-Offs) Recoveries	204	(112)
Ending Balance	5,947	4,710	5,782
Real Estate - Residential [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	15,056	10,741	10,741
Provision for Credit Losses	(248)	1,152
Charge-Offs	(17)	0	(79)
Recoveries	37	57
Net (Charge-Offs) Recoveries	20	57
Ending Balance	14,828	11,950	15,056
Real Estate - Home Equity [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	1,818	1,864	1,864
Provision for Credit Losses	130	(10)
Charge-Offs	(76)	0	(39)
Recoveries	24	25
Net (Charge-Offs) Recoveries	(52)	25
Ending Balance	1,896	1,879	1,818
Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3,301	3,488	3,488
Provision for Credit Losses	1,388	1,329
Charge-Offs	(2,188)	(2,366)	(8,543)
Recoveries	763	944
Net (Charge-Offs) Recoveries	(1,425)	(1,422)
Ending Balance	$ 3,264	$ 3,395	$ 3,301