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LINES OF CREDIT (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
LINES OF CREDIT      
Capital to risk based assets ratio 16.42%   16.41%
FHLB advances      
LINES OF CREDIT      
Interest rate 1.78% 2.67%  
Frost Line of Credit      
LINES OF CREDIT      
Outstanding borrowings     $ 0
Line of Credit | FHLB advances      
LINES OF CREDIT      
Outstanding borrowings $ 50,000,000   50,000,000
Total borrowing capacity available     $ 1,000,000,000
Average outstanding balance, FHLB advances 50,000,000 $ 9,700,000  
Line of Credit | Frost Line of Credit      
LINES OF CREDIT      
Revolving line of credit available $ 30,000,000    
Revolving line of credit draw period 24 months    
Line of credit payment terms payable quarterly over 24 months beginning December 13, 2019, and thereafter, quarterly principal and interest payments are required over a term of 60 months    
Debt term 60 months    
Line of Credit | Frost Line of Credit | Minimum      
LINES OF CREDIT      
Tangible capital $ 300,000,000    
Free cash flow coverage ratio 1.00%    
Capital to risk based assets ratio 12.00%    
Line of Credit | Frost Line of Credit | Maximum      
LINES OF CREDIT      
Free cash flow coverage ratio 1.25%    
Capital to risk based assets ratio 15.00%