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Summary of Significant Accounting Policies - Adoption of Financial Instruments - Credit Losses (Topic 326) (Details) - USD ($) $ in Thousands | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate2019-05 |  |  |  |  |
Cumulative-effect adjustment for implementation of fair value option |  | $ 2,253,383 | $ 2,162,941 | $ 2,205,029 | $ 1,846,999 | $ 1,527,682 | $ 1,180,293
Assets |  |  |  |  |  |  |
Fair Value |  | 218,706 |  | 189,965 |  |  |
Receivables and other assets |  | 142,945 |  | 169,214 |  |  |
Total Assets | [1] | 4,621,113 |  | 23,483,369 |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Accumulated deficit |  | (583,616) |  | (148,863) |  |  |
Total Stockholders' Equity |  | 2,253,383 |  | 2,205,733 |  |  |
Transition Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment for implementation of fair value option |  |  |  | 12,284 |  |  |
Assets |  |  |  |  |  |  |
Fair Value |  |  |  | 1,394 |  |  |
Investment amount |  |  |  | 2,420 |  |  |
Receivables and other assets |  |  |  | 2,755 |  |  |
Total Assets |  |  |  | 12,284 |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Accumulated deficit |  |  |  | 12,284 |  |  |
Total Stockholders' Equity |  |  |  | 12,284 |  |  |
Transition Adjustment | Residential loans, net |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Residential mortgage loans |  |  |  | 5,715 |  |  |
Cumulative Effect, Period Of Adoption, Adjusted Balance |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Fair Value |  |  |  | 107,477 |  |  |
Investment amount |  |  |  | 182,465 |  |  |
Receivables and other assets |  |  |  | 3,620 |  |  |
Total Assets |  |  |  | 502,033 |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Accumulated deficit |  |  |  | (136,579) |  |  |
Total Stockholders' Equity |  |  |  | (136,579) |  |  |
Cumulative Effect, Period Of Adoption, Adjusted Balance | Residential loans, net |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Residential mortgage loans |  |  |  | 208,471 |  |  |
Previously Reported |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Fair Value |  |  |  | 106,083 |  |  |
Investment amount |  |  |  | 180,045 |  |  |
Receivables and other assets |  |  |  | 865 |  |  |
Total Assets |  |  |  | 489,749 |  |  |
Stockholders' Equity |  |  |  |  |  |  |
Accumulated deficit |  |  |  | (148,863) |  |  |
Total Stockholders' Equity |  |  |  | (148,863) |  |  |
Previously Reported | Residential loans, net |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Residential mortgage loans |  |  |  | 202,756 |  |  |
Retained Earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment for implementation of fair value option |  | $ (583,616) | $ (646,629) | (148,863) | $ (145,896) | $ (128,207) | $ (103,178)
Retained Earnings | Transition Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Cumulative-effect adjustment for implementation of fair value option |  |  |  | $ 12,284 |  |  |
[1] | Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of September 30, 2020 and December 31, 2019, assets of consolidated VIEs totaled $1,852,657 and $19,270,384, respectively, and the liabilities of consolidated VIEs totaled $1,440,936 and $17,878,314, respectively. See Note 9 for further discussion.

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http://asc.fasb.org/extlink&oid=115929471&loc=d3e21914-107793 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 10 -Section 65 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 65 -Paragraph 15 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=120409616&loc=SL4590271-111686 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI 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