Annual report pursuant to Section 13 and 15(d)

Concentrations of Risk - Narrative (Details)

v3.24.0.1
Concentrations of Risk - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
May 31, 2021
Jul. 31, 2017
Concentration Risk [Line Items]          
Total payments on nonrecourse debt   $ 410,911 $ 399,402    
Private investors          
Concentration Risk [Line Items]          
Transfer of loans held-for-sale to portfolio loans $ 3,400,000 $ 1,100,000      
Private investors | Non-agency reverse mortgage loans | Credit Concentration Risk          
Concentration Risk [Line Items]          
Concentration risk (in percent) 84.50% 83.10%      
Private investors | HECM Buyouts | Credit Concentration Risk          
Concentration Risk [Line Items]          
Concentration risk (in percent) 8.00% 12.10%      
Private investors | Commercial mortgage loans | Credit Concentration Risk          
Concentration Risk [Line Items]          
Concentration risk (in percent) 7.50% 4.80%      
Ginnie Mae          
Concentration Risk [Line Items]          
Transfer of loans held-for-sale to portfolio loans $ 2,300,000 $ 1,100,000      
Mezzanine Financing Agreement | Non-Affiliated Blackstone Portfolio Companies          
Concentration Risk [Line Items]          
Face amount       $ 25,000 $ 45,000
Total payments on nonrecourse debt     $ 25,000