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LINES OF CREDIT (Details) - USD ($)
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
LINES OF CREDIT      
Capital to risk based assets ratio 16.56%   16.41%
Frost Line of Credit      
LINES OF CREDIT      
Outstanding borrowings $ 0   $ 0
Line of Credit | FHLB advances      
LINES OF CREDIT      
Outstanding borrowings 50,000,000.0   50,000,000.0
Total borrowing capacity available 1,000,000,000.0   $ 1,000,000,000.0
Average outstanding balance, FHLB advances $ 60,400,000 $ 46,600,000  
Interest rate 1.54% 2.54%  
Line of Credit | Frost Line of Credit      
LINES OF CREDIT      
Revolving line of credit available $ 30,000,000.0    
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%