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
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgage loans held for sale, at fair value $ 1,763,121   $ 901,227 $ 932,771   $ 845,775
Reverse mortgage loans held for investment, at fair value 409,144 $ 376,182 315,912 81,457 $ 36,709 0
Home Equity Conversion Mortgage-Backed Securities (“HMBS”) related borrowings 391,524 $ 358,101 302,183 $ 71,278 $ 0 $ 0
Recurring Fair Value Measurements            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgage loans held for sale, at fair value 1,763,121   901,227      
Reverse mortgage loans held for investment, at fair value 409,144   315,912      
Notes receivable 11,177   10,627      
Home Equity Conversion Mortgage-Backed Securities (“HMBS”) related borrowings 391,524   302,183      
Recurring Fair Value Measurements | Level 3            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgage loans held for sale, at fair value 0   0      
Reverse mortgage loans held for investment, at fair value 409,144   315,912      
Notes receivable 11,177   10,627      
Home Equity Conversion Mortgage-Backed Securities (“HMBS”) related borrowings 391,524   302,183      
Mortgage Loans Held For Sale            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgages held for sale unpaid principal balance 1,754,737   892,816      
Gain loss on mortgage loans held for sale at fair value 8,384   8,411      
Fair value, option, loans held as assets, 90 days or more past due 6,800   7,300      
Mortgages held for sale unpaid principal balance due 8,900   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 26,628   25,005      
Reverse mortgage loans held for investment, principal amount due upon maturity 382,516   290,907      
Fair value, option, loans held as assets, 90 days or more past due 3,000   3,400      
Loans held for investment, that were 90 days or more past due, unpaid principal balance 2,900   3,300      
Notes Receivable            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Gain loss on mortgage loans held for sale at fair value (871)   (929)      
Notes receivable, principal amount due upon maturity 12,048   11,556      
Debt            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Gain loss on mortgage loans held for sale at fair value 8,028   8,641      
HMBS related borrowings, principal amount due upon maturity $ 383,496   $ 293,542