LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Activity in the allowance for credit losses) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 23,816	$ 13,905
Provision for credit losses	(2,312)	4,990
Charge-Offs	(1,136)	(2,080)
Recoveries	1,658	999
Net Charge-Offs	522	(1,081)
Ending Balance	22,026	21,083
Impact of Adoption of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		3,269
Commercial, Financial and Agricultural [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	2,204	1,675
Provision for credit losses	(314)	406
Charge-Offs	(69)	(362)
Recoveries	136	40
Net Charge-Offs	67	(322)
Ending Balance	1,957	2,247
Commercial, Financial and 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	2,479	370
Provision for credit losses	(225)	567
Charge-Offs	0	0
Recoveries	0	0
Net Charge-Offs	0	0
Ending Balance	2,254	1,239
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	7,029	3,416
Provision for credit losses	(718)	774
Charge-Offs	0	(11)
Recoveries	645	191
Net Charge-Offs	645	180
Ending Balance	6,956	5,828
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	5,440	3,128
Provision for credit losses	(305)	1,704
Charge-Offs	(6)	(110)
Recoveries	75	40
Net Charge-Offs	69	(70)
Ending Balance	5,204	6,005
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	3,111	2,224
Provision for credit losses	(655)	101
Charge-Offs	(5)	(31)
Recoveries	124	33
Net Charge-Offs	119	2
Ending Balance	2,575	2,701
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	3,553	3,092
Provision for credit losses	(95)	1,438
Charge-Offs	(1,056)	(1,566)
Recoveries	678	695
Net Charge-Offs	(378)	(871)
Ending Balance	$ 3,080	3,063
Consumer [Member] \| Impact of Adoption of ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance		$ (596)

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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