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Fair Value of Financial Instruments - Valuation for Level 3 Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period |  | $ 17,777,280 | $ 11,022,248
Total losses (realized/unrealized) |  |  |
Included in earnings |  |  | 443,823
Purchases |  |  | 7,309,459
Paydowns |  |  | 994,993
Charge-off | $ (3,257) |  |
Balance at the end of period |  |  | 17,777,280
Multi-Family CDOs |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 11,022,248 | 9,189,459 | 6,624,896
Total losses (realized/unrealized) |  |  |
Included in earnings | 443,796 | (211,738) | (82,650)
Purchases | 6,253,739 | 2,182,330 | 2,784,377
Paydowns | (992,075) | (137,803) | (137,164)
Charge-off | (3,257) |  |
Balance at the end of period | 16,724,451 | 11,022,248 | $ 9,189,459
SLST CDOs |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Balance at beginning of period | 0 |  |
Total losses (realized/unrealized) |  |  |
Included in earnings | 27 |  |
Purchases | 1,055,720 |  |
Paydowns | (2,918) |  |
Charge-off | 0 |  |
Balance at the end of period | $ 1,052,829 | $ 0 |

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Charge-offs + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability 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=117815213&loc=d3e19207-110258 + Details
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