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LONG-TERM BORROWINGS - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2025
USD ($)
trust
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2025
USD ($)
trust
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]            
Number of unconsolidated subsidiary trusts | trust 4       4  
Percent of the common equity of each trust owned by the corporation 100.00%       100.00%  
Tenor spread adjustment         0.0026  
Aggregate principal amount $ 645,000,000       $ 645,000,000  
Trust Preferred Securities            
Debt Instrument [Line Items]            
Rate Reset Factor [Extensible Enumeration]         Secured Overnight Financing Rate (SOFR) [Member]  
Federal Home Loan Bank Advances            
Debt Instrument [Line Items]            
Credit available with FHLB 12,000,000,000.0       $ 12,000,000,000.0  
FHLB amount available for borrowing 9,100,000,000       9,100,000,000  
Collateral pledged 16,700,000,000       $ 16,700,000,000  
Weighted average interest rate         4.27% 4.74%
Subordinated Notes            
Debt Instrument [Line Items]            
Written notice for holder         30 days  
Subordinated Notes | Minimum            
Debt Instrument [Line Items]            
Months prior to maturity, interest discount         3 months  
Subordinated Notes | Maximum            
Debt Instrument [Line Items]            
Months prior to maturity, interest discount         12 months  
Other Wholesale Credit            
Debt Instrument [Line Items]            
Wholesale credit availability 9,100,000,000       $ 9,100,000,000  
Other Subordinated Debt            
Debt Instrument [Line Items]            
Repayments of debt 100,000,000.0   $ 25,000,000.0      
Aggregate principal amount 145,000,000       $ 145,000,000  
Other Subordinated Debt | 5.722% Fixed-To-Floating Rate Senior Notes due December 11, 2030            
Debt Instrument [Line Items]            
Rate Reset Factor [Extensible Enumeration]         Secured Overnight Financing Rate (SOFR) [Member]  
Aggregate principal amount       $ 500,000,000   $ 500,000,000
Interest Rate       5.722%   5.722%
Net Proceeds       $ 496,700,000    
Senior Notes            
Debt Instrument [Line Items]            
Repayments of debt   $ 350,000,000.0        
Aggregate principal amount 500,000,000       $ 500,000,000  
Senior Notes | 5.722% Fixed-To-Floating Rate Senior Notes due December 11, 2030            
Debt Instrument [Line Items]            
Aggregate principal amount $ 500,000,000       $ 500,000,000  
Interest Rate 5.722%       5.722%