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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Interest income $ 148,542 $ 82,976 $ 279,583 $ 159,595
Interest expense (116,220) (48,213) (215,496) (89,727)
Net Interest Income 32,322 34,763 64,087 69,868
Non-interest Income        
Mortgage banking activities, net 19,160 10,596 31,469 37,172
Investment fair value changes, net 3,138 889 23,297 2,498
Other income (expense), net 2,407 3,322 5,994 5,440
Realized gains, net 2,827 4,714 13,513 14,077
Total non-interest income, net 27,532 19,521 74,273 59,187
Direct operating expenses (26,255) (19,009) (49,414) (42,039)
Provision for income taxes (2,333) (2,528) (3,216) (7,424)
Net Income 31,266 32,747 85,730 79,592
Non-cash amortization income (expense), net (517) 3,741 (172) 7,382
Operating Segments | Investment Portfolio        
Segment Reporting Information [Line Items]        
Interest income 132,048 64,569 247,500 123,326
Interest expense (93,912) (27,004) (171,799) (46,867)
Net Interest Income 38,136 37,565 75,701 76,459
Non-interest Income        
Mortgage banking activities, net 0 0 0 0
Investment fair value changes, net 3,297 1,600 23,853 3,190
Other income (expense), net 2,874 3,322 4,095 5,440
Realized gains, net 2,827 4,714 13,513 14,077
Total non-interest income, net 8,998 9,636 41,461 22,707
Direct operating expenses (2,258) (1,858) (4,919) (3,865)
Provision for income taxes (896) (1,130) (1,238) (2,018)
Net Income 43,980 44,213 111,005 93,283
Non-cash amortization income (expense), net 2,622 4,654 4,990 9,271
Operating Segments | Mortgage Banking        
Segment Reporting Information [Line Items]        
Interest income 11,352 13,084 21,729 25,981
Interest expense (6,595) (7,629) (12,159) (13,766)
Net Interest Income 4,757 5,455 9,570 12,215
Non-interest Income        
Mortgage banking activities, net 19,160 10,596 31,469 37,172
Investment fair value changes, net 0 0 0 0
Other income (expense), net (156) 0 (323) 0
Realized gains, net 0 0 0 0
Total non-interest income, net 19,004 10,596 31,146 37,172
Direct operating expenses (11,571) (5,739) (19,675) (14,371)
Provision for income taxes (1,437) (1,398) (1,978) (5,406)
Net Income 10,753 8,914 19,063 29,610
Non-cash amortization income (expense), net (2,014) (22) (2,737) (44)
Corporate/Other        
Segment Reporting Information [Line Items]        
Interest income 5,142 5,323 10,354 10,288
Interest expense (15,713) (13,580) (31,538) (29,094)
Net Interest Income (10,571) (8,257) (21,184) (18,806)
Non-interest Income        
Mortgage banking activities, net 0 0 0 0
Investment fair value changes, net (159) (711) (556) (692)
Other income (expense), net (311) 0 2,222 0
Realized gains, net 0 0 0 0
Total non-interest income, net (470) (711) 1,666 (692)
Direct operating expenses (12,426) (11,412) (24,820) (23,803)
Provision for income taxes 0 0 0 0
Net Income (23,467) (20,380) (44,338) (43,301)
Non-cash amortization income (expense), net $ (1,125) $ (891) $ (2,425) $ (1,845)