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, 2020
Mar. 31, 2019
Activity in the allowance for loan losses by portfolio class    
Provision for Loan Losses $ 4,990 $ 767
Charge-Offs   (1,361)
Recoveries   504
Net Charge-Offs   (857)
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 13,905 14,210
Provision for credit losses 4,990  
Charge-Offs (2,080)  
Recoveries 999  
Net Charge-Offs (1,081)  
Ending Balance 21,083 14,120
Impact of Adoption of ASC 326 [Member]    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 3,269  
Commercial, Financial and Agricultural [Member]    
Activity in the allowance for loan losses by portfolio class    
Provision for Loan Losses   217
Charge-Offs   (95)
Recoveries   74
Net Charge-Offs   (21)
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 1,675 1,434
Provision for credit losses 406  
Charge-Offs (362)  
Recoveries 40  
Net Charge-Offs (322)  
Ending Balance 2,247 1,630
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]    
Activity in the allowance for loan losses by portfolio class    
Provision for Loan Losses   101
Charge-Offs   0
Recoveries   0
Net Charge-Offs   0
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 370 280
Provision for credit losses 567  
Charge-Offs 0  
Recoveries 0  
Net Charge-Offs 0  
Ending Balance 1,239 381
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]    
Activity in the allowance for loan losses by portfolio class    
Provision for Loan Losses   (103)
Charge-Offs   (155)
Recoveries   70
Net Charge-Offs   (85)
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 3,416 4,181
Provision for credit losses 774  
Charge-Offs (11)  
Recoveries 191  
Net Charge-Offs 180  
Ending Balance 5,828 3,993
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]    
Activity in the allowance for loan losses by portfolio class    
Provision for Loan Losses   6
Charge-Offs   (264)
Recoveries   44
Net Charge-Offs   (220)
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 3,128 3,400
Provision for credit losses 1,704  
Charge-Offs (110)  
Recoveries 40  
Net Charge-Offs (70)  
Ending Balance 6,005 3,186
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]    
Activity in the allowance for loan losses by portfolio class    
Provision for Loan Losses   (20)
Charge-Offs   (52)
Recoveries   32
Net Charge-Offs   (20)
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 2,224 2,301
Provision for credit losses 101  
Charge-Offs (31)  
Recoveries 33  
Net Charge-Offs 2  
Ending Balance 2,701 2,261
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]    
Activity in the allowance for loan losses by portfolio class    
Provision for Loan Losses   566
Charge-Offs   (795)
Recoveries   284
Net Charge-Offs   (511)
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance 3,092 2,614
Provision for credit losses 1,438  
Charge-Offs (1,566)  
Recoveries 695  
Net Charge-Offs (871)  
Ending Balance 3,063 $ 2,669
Consumer [Member] | Impact of Adoption of ASC 326 [Member]    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning Balance $ (596)