Annual report pursuant to Section 13 and 15(d)

HMBS Related Obligations, at Fair Value - Additional information (Detail)

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HMBS Related Obligations, at Fair Value - Additional information (Detail) - LoanPools
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Home Equity Conversion Mortgage Backed Security Related Obligations At Fair Value [Abstract]    
Ginnie Mae loan pools 1,849 1,693