MORTGAGE SERVICING RIGHTS - Presentation of Activity Related to MSR (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Servicing Asset at Fair Value, Amount [Roll Forward]
Fair value, beginning of period	$ 1,748,209	$ 544,562
Purchases	397,585	1,009,351
Transfers	0	82,650
Sales	0	9,084
Changes in valuation inputs or assumptions	92,374	205,463
Other changes, including realization of expected cash flows	(115,972)	(84,733)
Fair value, end of period	$ 2,122,196	$ 1,748,209