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SECURED FINANCING - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Repurchase Agreements:    
Netted amounts $ 54,160,731 $ 54,769,643 [1]
Repurchase agreements - weighted average remaining maturities 57 days 52 days
Repurchase agreement amount $ 1,800,000  
Remaining capacity of repurchase agreement 1,400,000  
Other secured financing $ 250,000 $ 903,255 [1]
Debt weighted average interest rate 5.81%  
Secured financings and interest rate swaps - collateral held, estimated fair value $ 57,200,000 59,200,000
Secured financings and interest rate swaps - collateral held, accrued interest 199,100 $ 160,800
Line of Credit | Mortgage Servicing Rights Committed Credit Facility    
Repurchase Agreements:    
Credit facility, maximum borrowing capacity 250,000  
Line of Credit | Mortgage Servicing Rights Incremental Facility    
Repurchase Agreements:    
Credit facility, maximum borrowing capacity $ 250,000  
Minimum    
Repurchase Agreements:    
Debt Instrument, Maturity 1 year  
Maximum    
Repurchase Agreements:    
Debt Instrument, Maturity 3 years  
[1] (1)Derived from the audited consolidated financial statements at December 31, 2021.