Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS - Summary of Fair Value Option for Mortgage Loans Held for Sale (Details)

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FAIR VALUE MEASUREMENTS - Summary of Fair Value Option for Mortgage Loans Held for Sale (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held for sale, at fair value $ 1,126,159 $ 901,227 $ 858,314 $ 845,775
Reverse mortgage loans held for investment, at fair value 348,076 315,912    
Home Equity Conversion Mortgage-Backed Securities (“HMBS”) related borrowings 326,804 302,183    
Mortgage Loans Held For Sale        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgages held for sale unpaid principal balance 1,125,664 892,816    
Gain loss on mortgage loans held for sale at fair value 495 8,411    
Fair value, option, loans held as assets, 90 days or more past due 7,800 7,300    
Mortgages held for sale unpaid principal balance due 10,700 9,900    
Reverse Mortgage Loans Held For Investment        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gain loss on mortgage loans held for sale at fair value 35,595 25,005    
Reverse mortgage loans held for investment, principal amount due upon maturity 312,481 290,907    
Fair value, option, loans held as assets, 90 days or more past due 6,400 3,400    
Mortgages held for sale unpaid principal balance due 5,900 3,300    
Notes Receivable        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gain loss on mortgage loans held for sale at fair value (699) (929)    
Notes receivable, principal amount due upon maturity 11,705 11,556    
Debt        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gain loss on mortgage loans held for sale at fair value 11,249 8,641    
HMBS related borrowings, principal amount due upon maturity $ 315,555 $ 293,542