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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Receivables Held-for-sale [Abstract] |  |  |  |  |
Multi-family loans, at lower of cost or fair value |  |  | $ 0 | $ 482,873 |
Commercial and industrial loans, at lower of cost or fair value |  |  | 55,683 | 0 |
Commercial real estate non-owner occupied loans, at lower of cost or fair value |  |  | 17,251 | 0 |
Total commercial loans held for sale |  |  | 72,934 | 482,873 |
Home equity conversion mortgages, at lower of cost or fair value |  |  | 643 | 1,325 |
Residential mortgage loans, at fair value |  |  | 5,509 | 2,130 |
Total consumer loans held for sale |  |  | 6,152 | 3,455 |
Loans held for sale |  |  | 79,086 | 486,328 |
Transfer of loans held for investment to held for sale | $ 401,100 | $ 499,800 | 74,050 | 499,774 | $ 0
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Loans held for sale |  |  | 79,086 | 486,328 |
Nonperforming |  |  |  |  |
Receivables Held-for-sale [Abstract] |  |  |  |  |
Loans held for sale |  |  | 18,500 | 1,300 |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
Loans held for sale |  |  | $ 18,500 | $ 1,300 |

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