Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of HMBS Related Obligations (Detail)

v3.22.1
Fair Value - Summary of HMBS Related Obligations (Detail) - HMBS Related Obligations [Member] - Weighted Average [Member]
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Conditional repayment rate [Member]    
Fair Value HMBS Related Obligations Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Conditional repayment rate 21.60% 20.80%
Discount rate [Member]    
Fair Value HMBS Related Obligations Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Discount rate 3.30% 2.30%