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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Receivables Held-for-sale [Abstract] |  |  |  |
Multi-family loans, at lower of cost or fair value |  | $ 482,873 | $ 0 |
Total commercial loans held for sale |  | 482,873 | 0 |
Home equity conversion mortgages, at lower of cost or fair value |  | 1,325 | 0 |
Residential mortgage loans, at fair value |  | 2,130 | 1,507 |
Total consumer loans held for sale |  | 3,455 | 1,507 |
Loans held for sale |  | 486,328 | 1,507 |
Transfer of loans held for investment to held for sale | $ 499,800 | $ 499,774 | $ 0 | $ 150,638

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- Definition Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Consumer, Home Equity Conversion + References No definition available. + Details
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- Definition Loans Receivable Held-for-sale, Net, Not Part of Disposal Group, Commercial, Real Estate1 + References No definition available. + Details
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- Definition Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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- Definition Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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