Annual report pursuant to Section 13 and 15(d)

Fair Value - Summary of Fair Value and Unpaid Principal Balance ("UPB") of Financial Assets and Liabilities With Elected Fair Value Option (Details)

v3.22.4
Fair Value - Summary of Fair Value and Unpaid Principal Balance ("UPB") of Financial Assets and Liabilities With Elected Fair Value Option (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Estimated Fair Value    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value $ 11,114,100 $ 10,556,054
Estimated Fair Value | Loans held for investment | Reverse mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 771,724 940,604
Estimated Fair Value | Loans held for investment | Commercial mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 136,274 90,724
Estimated Fair Value | Loans held for sale | Commercial mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 161,861 149,426
Estimated Fair Value | Loans held for sale | Residential mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 154,117 1,902,952
Estimated Fair Value | HMBS related obligations    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 10,996,755 10,422,358
Estimated Fair Value | Nonrecourse debt in consolidated VIE trusts    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 7,175,857 5,857,069
Estimated Fair Value | Nonrecourse MSR financing liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 60,562 142,435
Estimated Fair Value | Nonrecourse commercial loan financing liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 106,758 111,738
Estimated Fair Value | Reverse mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 9,356  
Estimated Fair Value | Reverse mortgage loans | Loans held for investment, subject to nonrecourse debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 7,065,477 5,823,301
Estimated Fair Value | Commercial mortgage loans | Loans held for investment, subject to nonrecourse debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 389,161 394,893
Unpaid Principal Balance    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 10,719,000 9,849,835
Unpaid Principal Balance | Loans held for investment | Reverse mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 724,800 815,426
Unpaid Principal Balance | Loans held for investment | Commercial mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 143,373 89,267
Unpaid Principal Balance | Loans held for sale | Commercial mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 173,112 145,463
Unpaid Principal Balance | Loans held for sale | Residential mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 167,407 1,859,788
Unpaid Principal Balance | HMBS related obligations    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 10,719,000 9,849,835
Unpaid Principal Balance | Nonrecourse debt in consolidated VIE trusts    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 7,819,992 5,709,946
Unpaid Principal Balance | Nonrecourse MSR financing liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 60,562 142,435
Unpaid Principal Balance | Nonrecourse commercial loan financing liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 105,291 107,744
Unpaid Principal Balance | Reverse mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 9,356  
Unpaid Principal Balance | Reverse mortgage loans | Loans held for investment, subject to nonrecourse debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 7,240,125 5,165,479
Unpaid Principal Balance | Commercial mortgage loans | Loans held for investment, subject to nonrecourse debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance $ 405,970 $ 388,788