Mortgage Servicing Rights, at Fair Value - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|---|
Sep. 30, 2021 |
Mar. 31, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
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| Transfers and Servicing [Abstract] | |||||
| Contractually specified servicing fees, late fees, and other ancillary servicing revenue | $ 14.4 | $ 13.0 | $ 5.8 | $ 28.1 | $ 7.6 |
| X | ||||||||||
- Definition Amount of contractually specified servicing fee, late fee, and ancillary fee recognized as income for servicing asset and servicing liability. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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