LOANS - Additional Data On Residential Mortgage Loans (Details) - Residential Mortgage Loans $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) point	Dec. 31, 2021 USD ($) point
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 10,516,244	$ 7,535,855
Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 3	$ 1
Interest rate	1.13%	0.75%
FICO score at loan origination | point	588	604
Loan-to-value ratio at loan origination	5.00%	8.00%
Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 4,396	$ 4,382
Interest rate	15.00%	9.24%
FICO score at loan origination | point	832	831
Loan-to-value ratio at loan origination	100.00%	103.00%
Weighted Average
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 496	$ 513
Interest rate	4.18%	4.04%
FICO score at loan origination | point	761	762
Loan-to-value ratio at loan origination	67.00%	66.00%