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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Receivables Held-for-sale [Abstract] |  |
Home equity conversion mortgages, at lower of cost or fair value | $ 507 | $ 507
Residential mortgage loans, at fair value | 2,496 | 15,747
Total consumer loans held for sale | 3,003 | 16,254
Loans held for sale | $ 3,003 | $ 16,254

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