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Stockholders' Equity (AOCI Reclassifications) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net realized (loss)/gain on sales of securities and residential whole loans |  | $ 0 | $ (188,847) | $ 62,002
Other, net |  | 30,040 | (34,762) | 11,583
Net Income/(Loss) Available to Common Stock and Participating Securities |  | 295,995 | (709,186) | 363,117
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 | (660,594) | (47,234)
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 securities and residential whole loans |  | 0 | (389,127) | (44,600)
Other, net |  | 0 | (344,269) | (180)
Net Income/(Loss) Available to Common Stock and Participating Securities |  | 0 | (733,396) | (44,780)
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 | $ 72,802 | 0 |  | (2,454)
Net Income/(Loss) Available to Common Stock and Participating Securities |  | $ 0 | $ 72,802 | $ (2,454)

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