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BORROWINGS AND BORROWING CAPACITY - Narrative (Details)
Dec. 13, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 01, 2022
Debt Instrument [Line Items]        
Letters of credit, outstanding amount   $ 1,820,000,000 $ 1,080,000,000.00  
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   3,480,000,000    
Available borrowing capacity   1,610,000,000    
Outstanding amount   1,870,000,000    
FHLB letters of credit   1,824,090,000    
Federal Home Loan Bank of Dallas | Federal Home Loan Bank Advances        
Debt Instrument [Line Items]        
Federal Home Loan Bank, advances   $ 50,000,000    
Weighted average interest rate   5.75%    
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%