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BORROWINGS AND BORROWING CAPACITY - Narrative (Details)
Dec. 13, 2022
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 13, 2024
Debt Instrument [Line Items]        
Letters of credit, outstanding amount   $ 2,170,000,000 $ 2,100,000,000  
Revolving Credit Facility | Loan Agreement | Line of Credit        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 75,000,000.0      
Letters of credit, outstanding amount   0    
Interest payment period 24 months      
Debt service ratio       1.25
Texas ratio (as a percent)       0.200
Leverage ratio (as a percent)       0.080
Federal Home Loan Bank of Dallas        
Debt Instrument [Line Items]        
Maximum borrowing capacity   3,170,000,000    
Available borrowing capacity   997,100,000    
Outstanding amount   $ 2,170,000,000    
Federal Home Loan Bank of Dallas | Weighted Average | Federal Home Loan Bank Advances        
Debt Instrument [Line Items]        
Federal Home Loan Bank, advances, interest rate (as a percent) 2.75%