LOANS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	$ 73,637,249		$ 73,637,249		$ 76,764,064	[1]
Loan loss (provision) reversal	(26,913)	$ 494	(26,305)	$ (139,126)
Allowance for loan loss	0		0		27,900
Residential Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	1,500,000		1,500,000		2,300,000
Loans held-for-sale	$ 1,500		$ 1,500		$ 2,300
Percent of adjustable-rate loans	12.00%		12.00%		16.00%
Residential mortgage loan warehouse facility
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	$ 322		$ 322		$ 980

[1] (1)Derived from the audited consolidated financial statements at December 31, 2021.