LOANS - Additional Data On Residential Mortgage Loans (Details) - Residential Mortgage Loans $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) point	Dec. 31, 2023 USD ($) point
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 23,711,456	$ 16,611,204
Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 1	$ 1
Interest rate	2.00%	2.00%
FICO score at loan origination | point	549	549
Loan-to-value ratio at loan origination	3.00%	3.00%
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	18.00%	13.25%
FICO score at loan origination | point	850	850
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	$ 475	$ 477
Interest rate	6.31%	5.63%
FICO score at loan origination | point	758	758
Loan-to-value ratio at loan origination	68.00%	68.00%