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SECURED FINANCING - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Repurchase Agreements:    
Netted amounts $ 64,693,821 $ 59,512,597 [1]
Repurchase agreements, weighted average remaining maturities 52 days 27 days
Repurchase agreement amount $ 2,000,000  
Remaining capacity of repurchase agreement 1,200,000  
Other secured financing $ 500,000 $ 250,000 [1]
Debt weighted average interest rate 8.08%  
Secured financings and interest rate swaps - collateral held, estimated fair value $ 67,900,000 62,200,000
Secured financings and interest rate swaps - collateral held, accrued interest 284,100 $ 226,400
Line of Credit | Mortgage Servicing Rights Committed Credit Facility    
Repurchase Agreements:    
Credit facility, maximum borrowing capacity $ 750,000  
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, 2022.