v3.25.2
BORROWINGS - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
trust
Jun. 30, 2025
USD ($)
trust
Dec. 31, 2024
USD ($)
Debt Instrument [Line Items]      
Short-term advances $ 0.0 $ 0.0 $ 0.0
Federal home loan bank, advances, interest rate 0.35% 0.35% 0.34%
Number of unconsolidated subsidiary trusts | trust 4 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 $ 12,400.0 $ 12,400.0  
Credit with FHLB utilized 2,300.0 2,300.0  
Collateral pledged 17,300.0 17,300.0  
FHLB | Letter of Credit      
Debt Instrument [Line Items]      
Credit with FHLB utilized 450.0 450.0  
Other Subordinated Debt      
Debt Instrument [Line Items]      
Debt redeemed 25.0    
Other Wholesale Credit      
Debt Instrument [Line Items]      
Remaining borrowing capacity $ 6,300.0 $ 6,300.0  
Maximum | FHLB      
Debt Instrument [Line Items]      
Effective interest rates 4.69% 4.69% 4.88%
Minimum | FHLB      
Debt Instrument [Line Items]      
Effective interest rates 3.69% 3.69% 3.69%
FHLB      
Debt Instrument [Line Items]      
Short-term advances $ 385.0 $ 385.0 $ 335.0
Short-term advances, overnight maturities, percentage 43.50% 43.50% 57.30%
Basis points, interest rate, type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) [Member]  
Other Subordinated Debt | Maximum      
Debt Instrument [Line Items]      
Debt term   1 year