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Stockholders' Equity (AOCI Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net realized (loss)/gain on sales of residential mortgage securities and residential whole loans | $ 0 | $ (238,380)
Other, net | 3,607 | (2,011)
Net Income/(Loss) Available to Common Stock and Participating Securities | 77,303 | (914,210)
Amounts Reclassified from AOCI |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net Income/(Loss) Available to Common Stock and Participating Securities | 0 | (366,628)
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 | 0 | (23,953)
Other, net | 0 | (344,269)
Net Income/(Loss) Available to Common Stock and Participating Securities | $ 0 | (368,222)
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 |  | 1,594
Net Income/(Loss) Available to Common Stock and Participating Securities |  | $ 1,594

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