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LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Recorded Investment In Nonaccrual and Past Due Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual, with ACL $ 2,796 $ 3,283
Nonaccrual With No Allowance Credit Loss 2,566 2,588
90+ Days Still Accruing 0 0
Commercial, Financial and Agricultural [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual, with ACL 150 161
Nonaccrual With No Allowance Credit Loss 0 0
90+ Days Still Accruing 0 0
Real Estate - Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual, with ACL 179 179
Nonaccrual With No Allowance Credit Loss 0 0
90+ Days Still Accruing 0 0
Real Estate - Commercial Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual, with ACL 199 337
Nonaccrual With No Allowance Credit Loss 1,057 1,075
90+ Days Still Accruing 0 0
Real Estate - Residential [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual, with ACL 1,641 1,617
Nonaccrual With No Allowance Credit Loss 1,509 1,513
90+ Days Still Accruing 0 0
Real Estate - Home Equity [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual, with ACL 462 695
Nonaccrual With No Allowance Credit Loss 0 0
90+ Days Still Accruing 0 0
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Nonaccrual, with ACL 165 294
Nonaccrual With No Allowance Credit Loss 0 0
90+ Days Still Accruing $ 0 $ 0