BORROWINGS - Additional Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) trust	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Short-term advances	$ 0.0	$ 0.0
Federal home loan bank, advances, interest rate	0.35%	0.34%
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	$ 12,200.0
Credit with FHLB utilized	2,300.0
Collateral pledged	17,000.0
FHLB | Letter of Credit
Debt Instrument [Line Items]
Credit with FHLB utilized	650.0
Other Wholesale Credit
Debt Instrument [Line Items]
Remaining borrowing capacity	$ 6,300.0
Maximum | FHLB
Debt Instrument [Line Items]
Effective interest rates	4.69%	4.88%
Minimum | FHLB
Debt Instrument [Line Items]
Effective interest rates	3.69%	3.69%
FHLB
Debt Instrument [Line Items]
Short-term advances	$ 525.0	$ 335.0
Short-term advances, overnight maturities, percentage	51.20%	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