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Stockholders' Equity (AOCI Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized (loss)/gain on sales of residential mortgage securities and residential whole loans |  | $ (188,847) | $ 62,002 | $ 61,307
Other, net |  | (18,885) | (1,375) | (2,877)
Net Income/(Loss) Available to Common Stock and Participating Securities |  | (709,186) | 363,117 | 286,801
Amounts Reclassified from AOCI |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Income/(Loss) Available to Common Stock and Participating Securities |  | (660,594) | (47,234) | (52,839)
Amounts Reclassified from AOCI | AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Including Noncontrolling Interest |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized (loss)/gain on sales of residential mortgage securities and residential whole loans |  | (389,127) | (44,600) | (51,580)
Other, net |  | (344,269) | (180) | (1,259)
Net Income/(Loss) Available to Common Stock and Participating Securities |  | (733,396) | (44,780) | (52,839)
Amounts Reclassified from AOCI | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other, net | $ (2,454) | 72,802 |  | 0
Net Income/(Loss) Available to Common Stock and Participating Securities |  | $ 72,802 | $ (2,454) | $ 0

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