v3.26.3
BORROWINGS - Additional Information (Details)
$ in Millions
9 Months Ended
Sep. 30, 2026
USD ($)
trust
Sep. 30, 2025
Dec. 31, 2025
USD ($)
Debt Instrument [Line Items]      
Short-term advances $ 0.0   $ 0.0
Number of unconsolidated subsidiary trusts | trust 4    
Trust Preferred Securities      
Debt Instrument [Line Items]      
Basis points, interest rate, type [Extensible Enumeration] Secured Overnight Financing Rate (SOFR) [Member]    
Tenor spread adjustment 0.0026    
FHLB      
Debt Instrument [Line Items]      
Credit available with FHLB $ 12,000.0    
FHLB amount available for borrowing 8,600.0    
Collateral pledged $ 16,700.0    
Weighted average interest rate 3.94% 4.33%  
Other Wholesale Credit      
Debt Instrument [Line Items]      
Remaining borrowing capacity $ 9,500.0    
FHLB      
Debt Instrument [Line Items]      
Short-term advances $ 615.0   $ 530.0
Short-term advances, overnight maturities, percentage 30.50%   50.20%
Other Subordinated Debt | Maximum      
Debt Instrument [Line Items]      
Debt term 1 year