Quarterly report pursuant to Section 13 or 15(d)

Concentrations of Risk - Summary of Residential Mortgages (Detail)

v3.21.2
Concentrations of Risk - Summary of Residential Mortgages (Detail) - Credit Concentration Risk - Residential 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 36.00% 37.00%
Oregon    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 8.00% 7.00%
Washington    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 8.00% 8.00%
Arizona    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 6.00% 6.00%
New Jersey    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 5.00% 5.00%
Other    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 37.00% 37.00%