SECURED FINANCING - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Repurchase Agreements:
Net amounts of Repurchase agreements as presented in the Consolidated Statements of Financial Condition.	$ 65,688,923	$ 62,201,543
Repurchase agreements - weighted average remaining maturities	32 days	44 days
Repurchase agreements weighted average rates	4.76%	5.70%
Repurchase agreement amount	$ 3,600,000
Remaining capacity of repurchase agreement	2,200,000
Fair value of collateral received for reverse repurchase agreements	2,600,000	$ 2,300,000
Fair value of securities sold	2,500,000	2,100,000
Other secured financing	$ 750,000	$ 500,000
Debt weighted average interest rate	7.21%	8.09%
Secured financings and interest rate swaps - collateral held, estimated fair value	$ 71,800,000	$ 68,200,000
Secured financings and interest rate swaps - collateral held, accrued interest	$ 332,700	$ 279,500
Minimum
Repurchase Agreements:
Debt instrument, maturity	1 month	6 months
Maximum
Repurchase Agreements:
Debt instrument, maturity	2 years	1 year
Mortgage Servicing Rights Committed Credit Facility | Line of Credit
Repurchase Agreements:
Credit facility, maximum borrowing capacity	$ 1,600,000	$ 1,250,000