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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, 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 153,118 | $ 142,721 | $ 144,935 | $ 140,952 | $ 132,744 | $ 117,432 | $ 101,747 | $ 103,752 | $ 581,726 | $ 455,675 | $ 433,448
Interest expense | (82,463) | (85,823) | (85,044) | (79,026) | (70,944) | (58,878) | (51,810) | (50,554) | (332,356) | (232,186) | (197,141)
Net Interest Income | 70,655 | 56,898 | 59,891 | 61,926 | 61,800 | 58,554 | 49,937 | 53,198 | 249,370 | 223,489 | 236,307
Net gain on residential whole loans measured at fair value through earnings | 41,415 | 40,175 | 51,473 | 25,267 | 31,736 | 34,942 | 32,443 | 38,498 | 158,330 | 137,619 | 90,045
Net realized gain on sales of residential mortgage securities | 11,975 | 17,708 | 7,710 | 24,609 | 28,646 | 16,415 | 7,429 | 8,817 |  |  |
Other income | 2,007 | 4,546 | (2,321) | 1,293 | (39,432) | (2,998) | 1,134 | 345 |  |  |
Operating and other expense | (25,431) | (23,728) | (23,713) | (24,238) | (21,871) | (19,781) | (20,548) | (17,463) | (97,110) | (79,663) | (71,901)
Net Income | 100,621 | 95,599 | 93,040 | 88,857 | 60,879 | 87,132 | 70,395 | 83,395 | 378,117 | 301,801 | 322,393
Preferred stock dividends | (3,750) | (3,750) | (3,750) | (3,750) | (3,750) | (3,750) | (3,750) | (3,750) | (15,000) | (15,000) | (15,000)
Net income available to common stock and participating securities | $ 96,871 | $ 91,849 | $ 89,290 | $ 85,107 | $ 57,129 | $ 83,382 | $ 66,645 | $ 79,645 | $ 362,030 | $ 285,858 | $ 306,502
Earnings per Common Share - Basic and Diluted (in dollars per share) | $ 0.21 | $ 0.20 | $ 0.20 | $ 0.19 | $ 0.13 | $ 0.19 | $ 0.17 | $ 0.20 |  |  |

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