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Residential Whole Loans (Fair Value Components of Net Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |
Coupon payments and other income received |  |  |  |  |  |  |  |  | $ 82,168 | $ 70,515 | $ 41,399
Net unrealized gains |  |  |  |  |  |  |  |  | 47,849 | 36,725 | 33,617
Net gain on payoff/liquidation of loans |  |  |  |  |  |  |  |  | 9,270 | 11,087 | 4,958
Net gain on transfers to REO |  |  |  |  |  |  |  |  | 19,043 | 19,292 | 10,071
Total | $ 41,415 | $ 40,175 | $ 51,473 | $ 25,267 | $ 31,736 | $ 34,942 | $ 32,443 | $ 38,498 | $ 158,330 | $ 137,619 | $ 90,045

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