Quarterly report pursuant to Section 13 or 15(d)

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

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Mortgage Servicing Rights, at Fair Value - Summary of Information Regarding Loan Servicing Portfolio Delinquencies Percentages and Unpaid Balances (Detail)
Mar. 31, 2022
Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]    
Number of Loans 0.60% 0.60%
Unpaid Balance 0.60% 0.40%
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% 0.40%
Unpaid Balance 0.40% 0.30%
60 days [member]    
Servicing Assets at Fair Value [Line Items]    
Number of Loans 0.10% 0.10%
Unpaid Balance 0.10% 0.00%
90 or more days [member]    
Servicing Assets at Fair Value [Line Items]    
Number of Loans 0.10% 0.10%
Unpaid Balance 0.10% 0.10%