Quarterly report pursuant to Section 13 or 15(d)

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

v3.23.2
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
Jun. 30, 2023
Dec. 31, 2022
Estimated Fair Value    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value $ 16,883,718 $ 11,114,100
Estimated Fair Value | Loans held for investment | Reverse mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 678,811 771,724
Estimated Fair Value | Loans held for investment | Commercial mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 6,222 136,274
Estimated Fair Value | Loans held for sale | Commercial mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 10,695 161,861
Estimated Fair Value | Loans held for sale | Residential mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 42,805 12,123
Estimated Fair Value | HMBS related obligations    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 16,665,535 10,996,755
Estimated Fair Value | Nonrecourse debt in consolidated VIE trusts    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 7,737,529 7,175,857
Estimated Fair Value | Nonrecourse MSR financing liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value   60,562
Estimated Fair Value | Nonrecourse commercial loan financing liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 59,016 106,758
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 7,653,644 7,065,477
Estimated Fair Value | Commercial mortgage loans | Loans held for investment, subject to nonrecourse debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Estimated Fair Value 274,770 389,161
Unpaid Principal Balance    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 16,194,586 10,719,000
Unpaid Principal Balance | Loans held for investment | Reverse mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 663,279 724,800
Unpaid Principal Balance | Loans held for investment | Commercial mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 6,917 143,373
Unpaid Principal Balance | Loans held for sale | Commercial mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 12,221 173,112
Unpaid Principal Balance | Loans held for sale | Residential mortgage loans    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 50,792 15,529
Unpaid Principal Balance | HMBS related obligations    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 16,194,586 10,719,000
Unpaid Principal Balance | Nonrecourse debt in consolidated VIE trusts    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 8,421,299 7,819,992
Unpaid Principal Balance | Nonrecourse MSR financing liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance   60,562
Unpaid Principal Balance | Nonrecourse commercial loan financing liability    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance 57,543 105,291
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 7,958,848 7,240,125
Unpaid Principal Balance | Commercial mortgage loans | Loans held for investment, subject to nonrecourse debt    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Unpaid Principal Balance $ 280,526 $ 405,970