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BORROWINGS AND BORROWING CAPACITY - Narrative (Details)
Dec. 13, 2022
USD ($)
Dec. 31, 2022
USD ($)
Oct. 01, 2022
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]          
Letters of credit, outstanding amount   $ 1,080,000,000.00     $ 1,360,000,000
Frost Agreement | Line of Credit | Revolving Credit Facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 75,000,000        
Letters of credit, outstanding amount   0     $ 0
Period to draw 24 months        
Amortization period 60 months        
Interest payment period 24 months        
Cash flow to debt service ratio     1.25    
Texas Ratio     0.250    
Leverage Ratio     0.070    
Federal Home Loan Bank of Dallas          
Debt Instrument [Line Items]          
Maximum borrowing capacity   2,310,000,000      
Available borrowing capacity   1,160,000,000      
Outstanding amount       $ 1,150,000,000  
Letters of credit, outstanding amount   1,080,000,000.00      
Federal Home Loan Bank of Dallas | Federal Home Loan Bank Advances          
Debt Instrument [Line Items]          
Federal Home Loan Bank, advances   $ 64,000,000      
Weighted average interest rate   4.70%      
Federal Home Loan Bank of Dallas | Expire in 2023          
Debt Instrument [Line Items]          
Letters of credit, outstanding amount   $ 1,000,000,000      
Federal Home Loan Bank of Dallas | Expire In 2024          
Debt Instrument [Line Items]          
Letters of credit, outstanding amount   57,900,000      
Federal Home Loan Bank of Dallas | Expire In 2025          
Debt Instrument [Line Items]          
Letters of credit, outstanding amount   16,000,000      
Federal Home Loan Bank of Dallas | Expire In 2028          
Debt Instrument [Line Items]          
Letters of credit, outstanding amount   $ 5,000,000      
Federal Home Loan Bank of Dallas | Weighted Average | Federal Home Loan Bank Advances          
Debt Instrument [Line Items]          
Federal Home Loan Bank, advances, interest rate   3.50%