LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES - (Allowance for loan losses by portfolio segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 21,606	$ 23,816	$ 13,905
Provision for credit losses	7,065	(2,842)	9,035
Charge-Offs	(7,906)	(4,827)	(6,160)
Recoveries	3,971	5,459	3,767
Net (Charge-Offs) Recoveries	(3,935)	632	(2,393)
Ending Balance	24,736	21,606	23,816
Impact Of Adoption Of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			3,269
Commercial, Financial, Agricultural [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,191	2,204	1,675
Provision for credit losses	316	(227)	578
Charge-Offs	(1,308)	(239)	(789)
Recoveries	307	453	252
Net (Charge-Offs) Recoveries	(1,001)	214	(537)
Ending Balance	1,506	2,191	2,204
Commercial, Financial, Agricultural [Member] | Impact Of Adoption Of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			488
Real Estate - Construction [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3,302	2,479	370
Provision for credit losses	(658)	813	1,757
Charge-Offs	0	0	0
Recoveries	10	10	50
Net (Charge-Offs) Recoveries	10	10	50
Ending Balance	2,654	3,302	2,479
Real Estate - Construction [Member] | Impact Of Adoption Of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			302
Real Estate - Commercial Mortgage [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	5,810	7,029	3,416
Provision for credit losses	(746)	(1,679)	1,865
Charge-Offs	(355)	(405)	(28)
Recoveries	106	865	318
Net (Charge-Offs) Recoveries	(249)	460	290
Ending Balance	4,815	5,810	7,029
Real Estate - Commercial Mortgage [Member] | Impact Of Adoption Of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			1,458
Real Estate - Residential [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	4,129	5,440	3,128
Provision for credit losses	5,996	(1,956)	940
Charge-Offs	0	(108)	(150)
Recoveries	284	753	279
Net (Charge-Offs) Recoveries	284	645	129
Ending Balance	10,409	4,129	5,440
Real Estate - Residential [Member] | Impact Of Adoption Of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			1,243
Real Estate - Home Equity [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,296	3,111	2,224
Provision for credit losses	(422)	(1,125)	486
Charge-Offs	(193)	(103)	(151)
Recoveries	183	413	178
Net (Charge-Offs) Recoveries	(10)	310	27
Ending Balance	1,864	2,296	3,111
Real Estate - Home Equity [Member] | Impact Of Adoption Of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			374
Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	3,878	3,553	3,092
Provision for credit losses	2,579	1,332	3,409
Charge-Offs	(6,050)	(3,972)	(5,042)
Recoveries	3,081	2,965	2,690
Net (Charge-Offs) Recoveries	(2,969)	(1,007)	(2,352)
Ending Balance	$ 3,488	$ 3,878	3,553
Consumer [Member] | Impact Of Adoption Of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance			$ (596)