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Summary of Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 60,476 | $ 66,080 | $ 87,368 | $ 145,460 | $ 153,118 | $ 142,721 | $ 144,935 | $ 140,952 | $ 359,384 | $ 581,726 | $ 455,675
Interest expense | (41,044) | (55,964) | (87,991) | (83,759) | (82,463) | (85,823) | (85,044) | (79,026) | (268,758) | (332,356) | (232,186)
Net Interest Income | 19,432 | 10,116 | (623) | 61,701 | 70,655 | 56,898 | 59,891 | 61,926 | 90,626 | 249,370 | 223,489
Reversal (Provision) for Credit and Valuation Losses on Residential Whole Loans and Other Financial Instruments | 15,709 | 27,244 | 85,377 | (150,711) | (1,032) | (347) | (385) | (805) | (22,381) | (2,569) | (773)
Net Interest Income after Provision for Credit and Valuation Losses | 35,141 | 37,360 | 84,754 | (89,010) | 69,623 | 56,551 | 59,506 | 61,121 | 68,245 | 246,801 | 222,716
Net gain on residential whole loans measured at fair value through earnings | 49,782 | 76,871 | 20,320 | (52,760) | 41,415 | 40,175 | 51,473 | 25,267 | 94,213 | 158,330 | 137,619
Net realized gain on sales of residential mortgage securities and residential whole loans | 0 | 48 | 49,485 | (238,380) | 11,975 | 17,708 | 7,710 | 24,609 |  |  |
Other income | (18,708) | 292 | 6,552 | (499,623) | 2,007 | 4,546 | (2,321) | 1,293 |  |  |
Operating and other expense | (20,398) | (27,361) | (64,533) | (29,222) | (24,399) | (23,381) | (23,328) | (23,433) | (141,514) | (94,541) | (78,890)
Net Income/(Loss) | 45,817 | 87,210 | 96,578 | (908,995) | 100,621 | 95,599 | 93,040 | 88,857 | (679,390) | 378,117 | 301,801
Preferred stock dividends | (8,218) | (8,219) | (8,144) | (5,215) | (3,750) | (3,750) | (3,750) | (3,750) | (29,796) | (15,000) | (15,000)
Net income available to common stock and participating securities | $ 37,599 | $ 78,991 | $ 88,434 | $ (914,210) | $ 96,871 | $ 91,849 | $ 89,290 | $ 85,107 | $ (709,415) | $ 362,030 | $ 285,858
Earnings per Common Share - Basic (usd per share) | $ 0.08 | $ 0.17 | $ 0.19 | $ (2.02) |  |  |  |  | $ (1.57) | $ 0.80 | $ 0.68
Earnings per Common Share - Diluted (usd per share) | $ 0.08 | $ 0.17 | $ 0.19 | $ (2.02) |  |  |  |  | $ (1.57) | $ 0.79 | $ 0.68
Earnings per Common Share - Basic and Diluted (usd per share) |  |  |  |  | $ 0.21 | $ 0.20 | $ 0.20 | $ 0.19 |  |  |

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