Annual report pursuant to Section 13 and 15(d)

Concentrations of Risk - Summary of Residential Mortgages (Detail)

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Concentrations of Risk - Summary of Residential Mortgages (Detail) - Credit Concentration Risk - Residential Mortgage - Mortgage Loans Benchmark - Mortgage Loans Customer
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Concentration Risk [Line Items]    
Concentration Risk, Percentage 100.00% 100.00%
California    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 43.00% 37.00%
Washington    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 8.00% 8.00%
Oregon    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 6.00% 7.00%
Arizona    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 5.00% 6.00%
New Jersey    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 5.00% 5.00%
Other    
Concentration Risk [Line Items]    
Concentration Risk, Percentage 33.00% 37.00%