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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Interest income $ 99,397 $ 62,737 $ 258,992 $ 176,589
Interest expense (64,351) (27,443) (154,078) (72,708)
Net Interest Income 35,046 35,294 104,914 103,881
Non-interest Income        
Mortgage banking activities, net 11,224 21,200 48,396 50,850
Investment fair value changes, net 10,332 324 12,830 9,990
Other income, net 3,453 2,812 8,893 9,473
Realized gains, net 7,275 1,734 21,352 8,809
Total non-interest income, net 32,284 26,070 91,471 79,122
Direct operating expenses (21,490) (19,922) (63,529) (56,789)
Provision for income taxes (4,919) (5,262) (12,343) (16,741)
Net Income 40,921 36,180 120,513 109,473
Non-cash amortization income (expense), net 2,789 4,410 10,170 13,656
Operating Segments | Investment Portfolio        
Segment Reporting Information [Line Items]        
Interest income 79,556 47,023 202,882 135,106
Interest expense (40,852) (9,445) (87,719) (21,940)
Net Interest Income 38,704 37,578 115,163 113,166
Non-interest Income        
Mortgage banking activities, net 0 0 0 0
Investment fair value changes, net 10,566 1,372 13,756 13,846
Other income, net 3,334 2,812 8,774 9,473
Realized gains, net 7,275 1,734 21,352 9,561
Total non-interest income, net 21,175 5,918 43,882 32,880
Direct operating expenses (2,659) (1,324) (6,524) (4,371)
Provision for income taxes (2,840) (433) (4,858) (4,490)
Net Income 54,380 41,739 147,663 137,185
Non-cash amortization income (expense), net 4,019 5,222 13,290 16,263
Operating Segments | Mortgage Banking        
Segment Reporting Information [Line Items]        
Interest income 14,427 10,626 40,408 26,515
Interest expense (7,537) (4,135) (21,303) (11,462)
Net Interest Income 6,890 6,491 19,105 15,053
Non-interest Income        
Mortgage banking activities, net 11,224 21,200 48,396 50,850
Investment fair value changes, net 0 0 0 0
Other income, net 0 0 0 0
Realized gains, net 0 0 0 0
Total non-interest income, net 11,224 21,200 48,396 50,850
Direct operating expenses (6,570) (6,107) (20,941) (18,009)
Provision for income taxes (2,079) (4,829) (7,485) (12,251)
Net Income 9,465 16,755 39,075 35,643
Non-cash amortization income (expense), net (54) (25) (99) (79)
Corporate/Other        
Segment Reporting Information [Line Items]        
Interest income 5,414 5,088 15,702 14,968
Interest expense (15,962) (13,863) (45,056) (39,306)
Net Interest Income (10,548) (8,775) (29,354) (24,338)
Non-interest Income        
Mortgage banking activities, net 0 0 0 0
Investment fair value changes, net (234) (1,048) (926) (3,856)
Other income, net 119 0 119 0
Realized gains, net 0 0 0 (752)
Total non-interest income, net (115) (1,048) (807) (4,608)
Direct operating expenses (12,261) (12,491) (36,064) (34,409)
Provision for income taxes 0 0 0 0
Net Income (22,924) (22,314) (66,225) (63,355)
Non-cash amortization income (expense), net $ (1,176) $ (787) $ (3,021) $ (2,528)