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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | $ 59,000 | $ 108,000
Residential Loans |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | 12,920,000 | 4,370,000
Business purpose residential loans, held-for-sale, at fair value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | 2,220,000 | 1,400,000
Acquisitions | 136,685 | 0
HEIs |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Acquisitions | 155,023 | 3,517
MSRs and Other Investments |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Acquisitions | 15,215 | 450
Multifamily loans, held-for-investment, at fair value |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Acquisitions | 0 | 0
Servicer advance investments |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | 197,000 | 179,000
Excess MSRs |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | 18,000 | $ 11,000
Home Appreciation Option |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair value option elected aggregate carrying amount, asset | $ 15,000 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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