DERIVATIVES AND HEDGING - Derivatives and Hedging Notional Amount (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Interest rate swaps
Derivative [Line Items]
Derivative asset, notional amount	$ 9,074,000	$ 8,995,000
Interest rate swaps | TBAs, long position
Derivative [Line Items]
Notional amount	$ 3,100,000	$ 3,100,000
Derivative, cap interest rate	3.60%	3.60%
Weighted average maturity	66 months	71 months
Interest rate swaps | TBAs, short position
Derivative [Line Items]
Notional amount	$ 5,900,000	$ 5,900,000
Derivative, cap interest rate	3.80%	3.80%
Weighted average maturity	29 months	32 months
Interest rate futures
Derivative [Line Items]
Derivative liability, notional amount	$ 1,135,000	$ 0
Notional amount	$ 1,100,000
Weighted average maturity	63 months
IRLCs
Derivative [Line Items]
Derivative asset, notional amount	$ 4,343,640	3,413,043
TBAs | TBAs, short position
Derivative [Line Items]
Derivative liability, notional amount	16,258,921	17,402,824
Other commitments
Derivative [Line Items]
Derivative liability, notional amount	25,521	25,057
Foreign exchange forwards
Derivative [Line Items]
Derivative liability, notional amount	$ 61,550	$ 17,300