BORROWINGS - Long-term Borrowings (Details) - Parent - USD ($)	Jun. 30, 2025	Jun. 15, 2025	Mar. 12, 2025
Fixed-to-Floating Senior Notes at 5.231% | Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount			$ 500,000,000
Debt instrument, stated interest rate	5.231%		5.231%
Fixed-to-Fixed Subordinated Notes at 6.254% | Subordinated Debt
Debt Instrument [Line Items]
Debt instrument, face amount			$ 750,000,000
Debt instrument, stated interest rate	6.254%		6.254%
Fixed-to-Fixed Subordinated Notes At 3.75% | Subordinated Debt
Debt Instrument [Line Items]
Debt instrument, face amount		$ 350,000,000
Debt instrument, stated interest rate		3.375%