Quarterly report [Sections 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
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgage loans held for sale, at fair value $ 1,750,229   $ 1,523,447 $ 1,763,121   $ 901,227
Reverse mortgage loans held for investment, at fair value 557,972 $ 516,899 451,704 409,144 $ 376,182 315,912
HMBS-related borrowings 534,610 $ 494,156 425,979 $ 391,524 $ 358,101 $ 302,183
Recurring Fair Value Measurements            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgage loans held for sale, at fair value 1,750,229   1,523,447      
Reverse mortgage loans held for investment, at fair value 557,972   451,704      
Notes receivable 12,322   11,894      
HMBS-related borrowings 534,610   425,979      
Mortgage Loans Held For Sale            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgages held for sale unpaid principal balance 1,740,838   1,529,592      
Gain loss on mortgage loans held for sale at fair value 9,391   (6,145)      
Fair value, option, loans held as assets, 90 days or more past due 10,200   5,700      
Mortgages held for sale unpaid principal balance due 13,300   7,300      
Reverse Mortgage Loans Held For Investment            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Gain loss on mortgage loans held for sale at fair value 43,042   30,897      
Reverse mortgage loans held for investment, unpaid principal balance 514,930   420,807      
Fair value, option, loans held as assets, 90 days or more past due 10,700   6,400      
Loans held for investment, that were 90 days or more past due, unpaid principal balance 10,300   6,100      
Notes Receivable            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Gain loss on mortgage loans held for sale at fair value (1,335)   (343)      
Notes receivable, unpaid principal balance 13,657   12,237      
Debt            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Gain loss on mortgage loans held for sale at fair value 12,939   9,231      
HMBS related borrowings, unpaid principal balance $ 521,671   $ 416,748