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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |
Coupon payments and other income received |  |  |  |  |  |  |  |  | $ 72,700 | $ 91,438 | $ 81,602
Net unrealized gains |  |  |  |  |  |  |  |  | 17,204 | 47,849 | 36,725
Net gain on transfers to REO |  |  |  |  |  |  |  |  | 4,309 | 19,043 | 19,292
Total | $ 49,782 | $ 76,871 | $ 20,320 | $ (52,760) | $ 41,415 | $ 40,175 | $ 51,473 | $ 25,267 | $ 94,213 | $ 158,330 | $ 137,619

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