Quarterly report [Sections 13 or 15(d)]

LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Activity in Allowance for Credit Losses) (Details)

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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, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 31,001 $ 29,251 $ 29,251
Provision for Credit Losses 635 1,083  
Charge-Offs (1,796) (1,611)  
Recoveries 1,159 1,011  
Net (Charge-Offs) Recoveries (637) (600)  
Ending Balance 30,999 29,734 31,001
Commercial, Financial and Agricultural [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 1,751 1,514 1,514
Provision for Credit Losses 137 47  
Charge-Offs (300) (168) (782)
Recoveries 74 75  
Net (Charge-Offs) Recoveries (226) (93)  
Ending Balance 1,662 1,468 1,751
Real Estate - Construction [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 1,681 2,384 2,384
Provision for Credit Losses (298) (151)  
Charge-Offs 0 0  
Recoveries 0 0  
Net (Charge-Offs) Recoveries 0 0  
Ending Balance 1,383 2,233 1,681
Real Estate - Commercial Mortgage [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 6,859 5,867 5,867
Provision for Credit Losses (364) 191  
Charge-Offs 0 0 (4)
Recoveries 84 3  
Net (Charge-Offs) Recoveries 84 3  
Ending Balance 6,579 6,061 6,859
Real Estate - Residential [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 15,317 14,568 14,568
Provision for Credit Losses 670 206  
Charge-Offs 0 (8) (136)
Recoveries 77 119  
Net (Charge-Offs) Recoveries 77 111  
Ending Balance 16,064 14,885 15,317
Real Estate - Home Equity [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 2,368 1,952 1,952
Provision for Credit Losses 8 68  
Charge-Offs (13) 0 (44)
Recoveries 10 9  
Net (Charge-Offs) Recoveries (3) 9  
Ending Balance 2,373 2,029 2,368
Consumer [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 3,025 2,966 2,966
Provision for Credit Losses 482 722  
Charge-Offs (1,483) (1,435) (5,954)
Recoveries 914 805  
Net (Charge-Offs) Recoveries (569) (630)  
Ending Balance $ 2,938 $ 3,058 $ 3,025