LOANS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	$ 81,850,712	$ 76,764,064
Net loan loss (provisions) reversals	(20,660)	(145,066)	$ 147,581
Allowance for loan loss	0	27,900
Residential mortgage loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	1,800,000	2,300,000
Loans held-for-sale	$ 1,300	$ 2,300
Percent of adjustable-rate loans	11.00%	16.00%
Residential mortgage loan warehouse facility
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	$ 0	$ 980