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
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgage loans held for sale, at fair value $ 1,729,007   $ 901,227 $ 1,125,992   $ 845,775
Reverse mortgage loans held for investment, at fair value 376,182 $ 348,076 315,912 36,709 $ 0 0
Home Equity Conversion Mortgage-Backed Securities (“HMBS”) related borrowings 358,101 $ 326,804 302,183 $ 0 $ 0 $ 0
Mortgage Loans Held For Sale            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Mortgages held for sale unpaid principal balance 1,723,047   892,816      
Gain loss on mortgage loans held for sale at fair value 5,960   8,411      
Fair value, option, loans held as assets, 90 days or more past due 5,600   7,300      
Mortgages held for sale unpaid principal balance due 7,300   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 40,491   25,005      
Reverse mortgage loans held for investment, principal amount due upon maturity 335,691   290,907      
Fair value, option, loans held as assets, 90 days or more past due 3,100   3,400      
Mortgages held for sale unpaid principal balance due 3,000   3,300      
Notes Receivable            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Gain loss on mortgage loans held for sale at fair value (488)   (929)      
Notes receivable, principal amount due upon maturity 11,864   11,556      
Debt            
Fair Value, Option, Quantitative Disclosures [Line Items]            
Gain loss on mortgage loans held for sale at fair value 9,236   8,641      
HMBS related borrowings, principal amount due upon maturity $ 348,865   $ 293,542