LOANS - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024		Sep. 30, 2024
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	$ 125,861,572	$ 103,556,384	[1]	$ 101,515,995
Percentage of portfolio	0.01
Residential mortgage loan, securitized amount	$ 10,900,000
Residential Mortgage Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Assets	4,000,000	3,500,000
Loans held-for-sale	$ 10,900	$ 10,000
Percent of adjustable-rate loans	14.00%	16.00%
Fair value	$ 33,520,608	$ 25,520,090
Residential mortgage loan, face value	33,602,207	26,297,725
Residential Mortgage Loans | Weighted Average
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Residential mortgage loan, face value	$ 463	$ 471
Loan-to-value ratio at loan origination	67.00%	68.00%
Residential Mortgage Loans | Financial Asset, Equal to or Greater than 90 Days Past Due
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fair value	$ 423,100
Residential mortgage loan, securitized amount	384,900
Residential mortgage loan, face value	426,200
Mortgage loans in foreclosure	$ 181,200
Residential Mortgage Loans | Financial Asset, Equal to or Greater than 90 Days Past Due | Weighted Average
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan-to-value ratio at loan origination	73.00%

[1] (1)Derived from the audited consolidated financial statements at December 31, 2024.