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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Interest income $ 119,725 $ 99,397 $ 82,976 $ 76,619 $ 71,468 $ 62,737 $ 59,224 $ 54,628 $ 378,717 $ 248,057 $ 246,355
Interest expense (84,961) (64,351) (48,213) (41,514) (36,108) (27,443) (24,234) (21,031) (239,039) (108,816) (88,528)
Net Interest Income 34,764 35,046 34,763 35,105 35,360 35,294 34,990 33,597 139,678 139,241 157,827
Reversal of provision for loan losses                 0 0 7,102
Non-interest income                      
Mortgage banking activities, net                 59,566 53,908 38,691
Investment fair value changes, net                 (25,689) 10,374 (28,574)
Other income, net                 12,874 12,436 20,691
Realized gains, net                 27,041 13,355 28,009
Total non-interest income, net (17,679) 32,284 19,521 39,666 10,951 26,070 25,297 27,755 73,792 90,073 58,817
Direct operating expenses (19,253) (21,490) (19,009) (23,030) (20,367) (19,922) (18,641) (18,226) (82,782) (77,156) (88,786)
Benefit from income taxes                 (11,088) (11,752) (3,708)
Net Income $ (913) $ 40,921 $ 32,747 $ 46,845 $ 30,933 $ 36,180 $ 36,324 $ 36,969 119,600 140,406 131,252
Non-cash amortization income (expense), net                 12,379 17,462 25,704
Operating Segments | Investment Portfolio                      
Segment Reporting Information [Line Items]                      
Interest income                 304,636 188,760 192,200
Interest expense                 (149,139) (36,690) (22,997)
Net Interest Income                 155,497 152,070 169,203
Reversal of provision for loan losses                     7,102
Non-interest income                      
Mortgage banking activities, net                 0 0 0
Investment fair value changes, net                 (24,693) 18,414 (24,367)
Other income, net                 12,433 12,436 20,691
Realized gains, net                 27,041 14,107 27,717
Total non-interest income, net                 14,781 44,957 24,041
Direct operating expenses                 (10,357) (6,028) (10,421)
Benefit from income taxes                 (3,741) (5,328) (1,848)
Net Income                 156,180 185,671 188,077
Non-cash amortization income (expense), net                 16,849 20,974 29,806
Operating Segments | Mortgage Banking                      
Segment Reporting Information [Line Items]                      
Interest income                 53,054 39,309 33,661
Interest expense                 (28,934) (17,369) (14,191)
Net Interest Income                 24,120 21,940 19,470
Reversal of provision for loan losses                     0
Non-interest income                      
Mortgage banking activities, net                 59,566 53,908 40,753
Investment fair value changes, net                 0 0 0
Other income, net                 0 0 0
Realized gains, net                 0 0 0
Total non-interest income, net                 59,566 53,908 40,753
Direct operating expenses                 (28,172) (25,113) (23,252)
Benefit from income taxes                 (7,347) (6,424) (1,860)
Net Income                 48,167 44,311 35,111
Non-cash amortization income (expense), net                 (181) (102) (130)
Corporate/ Other                      
Segment Reporting Information [Line Items]                      
Interest income                 21,027 19,988 20,494
Interest expense                 (60,966) (54,757) (51,340)
Net Interest Income                 (39,939) (34,769) (30,846)
Reversal of provision for loan losses                     0
Non-interest income                      
Mortgage banking activities, net                 0 0 (2,062)
Investment fair value changes, net                 (996) (8,040) (4,207)
Other income, net                 441 0 0
Realized gains, net                 0 (752) 292
Total non-interest income, net                 (555) (8,792) (5,977)
Direct operating expenses                 (44,253) (46,015) (55,113)
Benefit from income taxes                 0 0 0
Net Income                 (84,747) (89,576) (91,936)
Non-cash amortization income (expense), net                 $ (4,289) $ (3,410) $ (3,972)