Quarterly report pursuant to Section 13 or 15(d)

Mortgage Servicing Rights, at Fair Value - Additional Information (Detail)

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Mortgage Servicing Rights, at Fair Value - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]      
Contractually specified servicing fees, late fees, and other ancillary servicing revenue $ 14,300 $ 13,000  
Servicing Asset at Fair Value, Amount   $ 26,675,358  
Asset Pledged as Collateral with Right [Member]      
Servicing Assets at Fair Value [Line Items]      
Servicing Asset at Fair Value, Amount $ 164,000   $ 142,400