Quarterly report pursuant to Section 13 or 15(d)

LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Activity in the allowance for credit losses) (Details)

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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)