Quarterly report pursuant to Section 13 or 15(d)

Concentrations of Risk - Summary of Non Agency Reverse Mortgage (Detail)

v3.21.2
Concentrations of Risk - Summary of Non Agency Reverse Mortgage (Detail) - Credit Concentration Risk - Non Agency Reverse Mortgage
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Concentration Risk [Line Items]    
Concentration Risk, Percentage 100.00% 100.00%
California    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 79.00% 84.00%
Other    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 21.00% 16.00%