LOANS - Additional Data On Residential Mortgage Loans (Details) - Residential Mortgage Loans $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) point	Dec. 31, 2022 USD ($) point
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 13,743,613	$ 12,247,346
Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 3	$ 3
Interest rate	2.00%	2.00%
FICO score at loan origination | point	588	588
Loan-to-value ratio at loan origination	5.00%	5.00%
Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 4,396	$ 4,396
Interest rate	12.00%	15.00%
FICO score at loan origination | point	839	831
Loan-to-value ratio at loan origination	100.00%	100.00%
Weighted Average
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 481	$ 489
Interest rate	4.97%	4.61%
FICO score at loan origination | point	758	759
Loan-to-value ratio at loan origination	68.00%	68.00%