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
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held for sale, at fair value $ 1,358,920 $ 1,523,447 $ 1,126,159 $ 901,227
Reverse mortgage loans held for investment, at fair value 482,151 451,704 348,076 315,912
HMBS-related borrowings 461,002 425,979 $ 326,804 $ 302,183
Recurring Fair Value Measurements        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgage loans held for sale, at fair value 1,358,920 1,523,447    
Reverse mortgage loans held for investment, at fair value 482,151 451,704    
Notes receivable 12,077 11,894    
HMBS-related borrowings 461,002 425,979    
Mortgage Loans Held For Sale        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Mortgages held for sale unpaid principal balance 1,357,824 1,529,592    
Gain loss on mortgage loans held for sale at fair value 1,096 (6,145)    
Fair value, option, loans held as assets, 90 days or more past due 7,800 5,700    
Mortgages held for sale unpaid principal balance due 9,800 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 33,684 30,897    
Reverse mortgage loans held for investment, unpaid principal balance 448,467 420,807    
Fair value, option, loans held as assets, 90 days or more past due 5,900 6,400    
Loans held for investment, that were 90 days or more past due, unpaid principal balance 5,600 6,100    
Notes Receivable        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gain loss on mortgage loans held for sale at fair value (343) (343)    
Notes receivable, unpaid principal balance 12,420 12,237    
Debt        
Fair Value, Option, Quantitative Disclosures [Line Items]        
Gain loss on mortgage loans held for sale at fair value 9,473 9,231    
HMBS related borrowings, unpaid principal balance $ 451,529 $ 416,748