Reverse Mortgage Portfolio Composition - Summarizes the Owned Reverse Mortgage Portfolio by Product Type (Detail) - USD ($) $ in Thousands |
Mar. 31, 2022 |
Dec. 31, 2021 |
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| Schedule Of Owned Reverse Mortgage Portfolio [Line Items] | ||
| Total owned reverse mortgage portfolio | $ 16,580,093 | $ 15,830,740 |
| Fixed rate loans | ||
| Schedule Of Owned Reverse Mortgage Portfolio [Line Items] | ||
| Total owned reverse mortgage portfolio | 6,566,169 | 5,384,865 |
| Adjustable rate loans | ||
| Schedule Of Owned Reverse Mortgage Portfolio [Line Items] | ||
| Total owned reverse mortgage portfolio | $ 10,013,924 | $ 10,445,875 |
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