Quarterly report pursuant to Section 13 or 15(d)

LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Collateral-dependent loans) (Details)

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LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Collateral-dependent loans) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans $ 7,300 $ 6,600
Real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 7,389  
Non real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 0  
Commercial, Financial and Agricultural [Member] | Real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 46  
Commercial, Financial and Agricultural [Member] | Non real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 0  
Real Estate - Commercial Mortgage [Member] | Real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 4,481  
Real Estate - Commercial Mortgage [Member] | Non real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 0  
Real Estate - Residential [Member] | Real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 2,373  
Real Estate - Residential [Member] | Non real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 0  
Real Estate - Home Equity [Member] | Real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 489  
Real Estate - Home Equity [Member] | Non real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 0  
Consumer [Member] | Real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans 0  
Consumer [Member] | Non real estate secured [Member]    
Loans and Leases Receivable Disclosure [Line Items]    
Collateral-dependent loans $ 0