Annual report pursuant to Section 13 and 15(d)

Mortgage Servicing Rights, at Fair Value - Summary of Information Regarding Loan Servicing Portfolio Delinquencies Percentages and Unpaid Balances (Detail)

v3.22.0.1
Mortgage Servicing Rights, at Fair Value - Summary of Information Regarding Loan Servicing Portfolio Delinquencies Percentages and Unpaid Balances (Detail)
Dec. 31, 2021
Dec. 31, 2020
Servicing Assets at Fair Value [Line Items]    
Number of Loans 0.60% 0.80%
Unpaid Balance 0.40% 0.70%
Foreclosure/real estate owned [member]    
Servicing Assets at Fair Value [Line Items]    
Number of Loans 0.00% 0.00%
Unpaid Balance 0.00% 0.00%
Portfolio delinquency 30 days [member]    
Servicing Assets at Fair Value [Line Items]    
Number of Loans 0.40% 0.50%
Unpaid Balance 0.30% 0.50%
60 days [member]    
Servicing Assets at Fair Value [Line Items]    
Number of Loans 0.10% 0.10%
Unpaid Balance 0.00% 0.10%
90 or more days [member]    
Servicing Assets at Fair Value [Line Items]    
Number of Loans 0.10% 0.20%
Unpaid Balance 0.10% 0.10%