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LONG-TERM BORROWINGS - Schedule of Subordinated Debt (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]    
Aggregate Principal Amount Issued $ 645,000,000  
Net Proceeds 641,000,000  
Carrying Value $ 641,000,000  
Basis points, tenor spread adjustment 0.0026  
Senior Notes    
Debt Instrument [Line Items]    
Aggregate Principal Amount Issued $ 500,000,000  
Net Proceeds 497,000,000  
Carrying Value 498,000,000  
Other Subordinated Debt    
Debt Instrument [Line Items]    
Aggregate Principal Amount Issued 145,000,000  
Net Proceeds 144,000,000  
Carrying Value $ 143,000,000  
5.722% Fixed-To-Floating Rate Senior Notes due December 11, 2030 | Senior Notes    
Debt Instrument [Line Items]    
Interest Rate 5.722%  
Aggregate Principal Amount Issued $ 500,000,000  
Net Proceeds 497,000,000  
Carrying Value $ 498,000,000  
5.722% Fixed-To-Floating Rate Senior Notes due December 11, 2030 | Other Subordinated Debt    
Debt Instrument [Line Items]    
Interest Rate   5.722%
Aggregate Principal Amount Issued   $ 500,000,000
Basis points, interest rate, type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]  
Basis points, spread 1.93%  
7.178% Fixed-To-Floating Rate Subordinated Notes due 2029 | Other Subordinated Debt    
Debt Instrument [Line Items]    
Interest Rate 6.515%  
Aggregate Principal Amount Issued $ 120,000,000  
Net Proceeds 118,000,000  
Carrying Value $ 119,000,000  
Basis points, interest rate, type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]  
Basis points, tenor spread adjustment 0.0026  
Basis points, spread 2.40%  
7.726% Fixed-To-Floating Rate Subordinated Notes due December 6, 2028 | Other Subordinated Debt    
Debt Instrument [Line Items]    
Interest Rate 7.019%  
Aggregate Principal Amount Issued $ 25,000,000  
Net Proceeds 26,000,000  
Carrying Value $ 24,000,000  
Basis points, interest rate, type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]  
Basis points, tenor spread adjustment 0.0026  
Basis points, spread 3.02%