DERIVATIVES AND HEDGING - Derivatives and Hedging Notional Amount (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Treasury short sales
Derivative [Line Items]
Derivative liabilities, reverse repurchase agreements	$ 1,800,000	$ 0
Not Designated as Hedging Instrument | Interest rate swaps
Derivative [Line Items]
Derivative asset, notional amount	7,979,988	23,085,000
Not Designated as Hedging Instrument | Interest rate swaps | TBAs, short position
Derivative [Line Items]
Notional amount	$ 0	$ 0
Derivative, cap interest rate	0.00%	0.00%
Weighted average maturity	0 months	0 months
Not Designated as Hedging Instrument | Interest rate swaps | TBAs, long position
Derivative [Line Items]
Notional amount	$ 8,000,000	$ 23,100,000
Derivative, cap interest rate	2.50%	1.90%
Weighted average maturity	32 months	35 months
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative asset, notional amount	$ 2,757,060	$ 2,647,747
Not Designated as Hedging Instrument | Treasury short sales
Derivative [Line Items]
Derivative liability, notional amount	1,800,000	0
Not Designated as Hedging Instrument | TBAs | TBAs, short position
Derivative [Line Items]
Derivative liability, notional amount	6,013,100	8,473,221
Not Designated as Hedging Instrument | TBAs | TBAs, long position
Derivative [Line Items]
Derivative liability, notional amount	$ 0	$ 31,500