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LINES OF CREDIT (Details)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
Dec. 31, 2021
USD ($)
LINES OF CREDIT      
Capital to risk based assets ratio 0.1509   0.1642
FHLB advances      
LINES OF CREDIT      
Weighted-average interest rate , FHLB advances 1.99% 1.77%  
Line of Credit | FHLB advances      
LINES OF CREDIT      
Outstanding borrowings     $ 50.0
Total borrowing capacity available $ 1,200.0   999.3
Letter of credit 27.0   26.0
Net capacity available 1,200.0   $ 923.3
Line of Credit | Frost Line of Credit      
LINES OF CREDIT      
Revolving line of credit available $ 30.0    
Revolving line of credit draw period 12 months    
Line of credit payment terms payable quarterly in the first 12 months and thereafter, quarterly principal and interest payments are required over a term of 60 months    
Debt term 60 months    
Outstanding borrowings $ 0.0    
Line of Credit | Frost Line of Credit | Minimum      
LINES OF CREDIT      
Tangible capital $ 300.0    
Free cash flow coverage ratio 0.0100    
Capital to risk based assets ratio 0.12    
Line of Credit | Frost Line of Credit | Maximum      
LINES OF CREDIT      
Free cash flow coverage ratio 0.0125    
Capital to risk based assets ratio 0.15