Annual report pursuant to Section 13 and 15(d)

Concentrations of Risk - Narrative (Details)

v3.22.4
Concentrations of Risk - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2020
May 31, 2021
Jul. 31, 2017
Concentration Risk [Line Items]            
Total payments on nonrecourse debt   $ 353,383 $ 399,402      
Entity revenue (in percent) 21.00% 22.00% 15.80% 23.00%    
Non-Affiliated Blackstone Portfolio Companies            
Concentration Risk [Line Items]            
Transfer of loans held-for-sale to portfolio loans $ 84,600 $ 424,800 $ 354,500 $ 168,700    
Gain (loss) on sale of mortgage loans 4,000 17,300 2,500 7,900    
Non-Affiliated Blackstone Portfolio Companies | Mezzanine Financing Agreement            
Concentration Risk [Line Items]            
Original Issue Amount         $ 25,000 $ 45,000
Total payments on nonrecourse debt   21,500 25,000      
Private investors            
Concentration Risk [Line Items]            
Transfer of loans held-for-sale to portfolio loans $ 1,724,300 $ 7,439,800 $ 6,801,500 $ 5,855,200    
Private investors | Non-agency reverse mortgage loans | Credit Concentration Risk            
Concentration Risk [Line Items]            
Concentration risk percentage   18.60% 41.90% 34.10%    
Private investors | Commercial Loans | Credit Concentration Risk            
Concentration Risk [Line Items]            
Concentration risk percentage 14.10% 6.10% 3.70% 7.60%    
Private investors | Residential mortgage loans | Credit Concentration Risk            
Concentration Risk [Line Items]            
Concentration risk percentage 52.80% 75.30% 54.40% 38.20%    
Private investors | Non Assignable Buy-Outs ("NABO") Loans | Credit Concentration Risk            
Concentration Risk [Line Items]            
Concentration risk percentage 33.10%     16.10%    
Private investors | Agency Reverse Mortgage Loan | Credit Concentration Risk            
Concentration Risk [Line Items]            
Concentration risk percentage       4.00%    
FNMA, FHLMC, and Ginnie Mae            
Concentration Risk [Line Items]            
Transfer of loans held-for-sale to portfolio loans $ 7,696,600 $ 20,516,100 $ 13,242,500 $ 27,229,100