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Fair Value of Financial Instruments (Level 3 Assets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Residential whole loans held at fair value for which the closing price of the purchase transaction had not occurred |  | $ 87,000 |  | $ 87,000 | $ 70,600
Recurring basis | Level 3 | Residential Whole Loans, at Fair Value |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance at beginning of period | $ 1,200,981 | 1,438,827 | $ 1,381,583 | 1,471,263 |
Purchases and capitalized advances | 0 | 85,855 | 0 | 210,030 |
Changes in fair value recorded in Net gain on residential whole loans measured at fair value through earnings | 58,863 | 13,185 | (13,683) | 33,312 |
Cash collections, net of liquidation gains/(losses) | (21,721) | (31,212) | (65,934) | (94,821) |
Sales and repurchases | (929) | 0 | (19,460) | (1,216) |
Transfer to REO | (7,530) | (53,486) | (52,842) | (165,399) |
Balance at end of period | $ 1,229,664 | 1,453,169 | $ 1,229,664 | 1,453,169 |
Recurring basis | Level 3 | Term Notes Backed by MSR-Related Collateral |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | 1,106,026 |  | 538,499 |
Purchases and capitalized advances |  | 0 |  | 573,137 |
Cash collections, net of liquidation gains/(losses) |  | (3,920) |  | (12,897) |
Changes in unrealized gains |  | 2,024 |  | 5,391 |
Transfer to Level 2 |  | (1,104,130) |  | (1,104,130) |
Balance at end of period |  | $ 0 |  | $ 0 |

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value, Repurchases + References No definition available. + Details
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- Definition Residential Whole Loans Held at Fair Value, Purchase Transaction Committed in Previous Period, Closed in Subsequent Period + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + 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 (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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