LOANS - Additional Data On Residential Mortgage Loans (Details) - Residential Mortgage Loans $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) point	Dec. 31, 2024 USD ($) point
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Unpaid principal balance	$ 33,602,207	$ 26,297,725
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	1.00%	2.00%
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%	18.00%
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	$ 463	$ 471
Interest rate	6.66%	6.43%
FICO score at loan origination | point	760	758
Loan-to-value ratio at loan origination	67.00%	68.00%