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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Interest income $ 82,976 $ 59,224 $ 159,595 $ 113,852
Interest expense (48,213) (24,234) (89,727) (45,265)
Net Interest Income 34,763 34,990 69,868 68,587
Non-interest Income        
Mortgage banking activities, net 10,596 12,046 37,172 29,650
Investment fair value changes, net 889 8,115 2,498 9,666
Other income, net 3,322 3,764 5,440 6,661
Realized gains, net 4,714 1,372 14,077 7,075
Total non-interest income, net 19,521 25,297 59,187 53,052
Direct operating expenses (19,009) (18,641) (42,039) (36,867)
Provision for income taxes (2,528) (5,322) (7,424) (11,479)
Net Income 32,747 36,324 79,592 73,293
Non-cash amortization income (expense), net 3,817 4,423 7,554 9,246
Operating Segments | Investment Portfolio        
Segment Reporting Information [Line Items]        
Interest income 64,569 45,833 123,326 88,083
Interest expense (27,004) (7,231) (46,867) (12,495)
Net Interest Income 37,565 38,602 76,459 75,588
Non-interest Income        
Mortgage banking activities, net 0 0 0 0
Investment fair value changes, net 1,600 9,115 3,190 12,474
Other income, net 3,322 3,764 5,440 6,661
Realized gains, net 4,714 2,124 14,077 7,827
Total non-interest income, net 9,636 15,003 22,707 26,962
Direct operating expenses (1,858) (1,454) (3,865) (3,047)
Provision for income taxes (1,130) (2,320) (2,018) (4,057)
Net Income 44,213 49,831 93,283 95,446
Non-cash amortization income (expense), net 4,654 5,194 9,271 11,041
Operating Segments | Residential Mortgage Banking        
Segment Reporting Information [Line Items]        
Interest income 13,084 8,415 25,981 15,889
Interest expense (7,629) (4,403) (13,766) (7,327)
Net Interest Income 5,455 4,012 12,215 8,562
Non-interest Income        
Mortgage banking activities, net 10,596 12,046 37,172 29,650
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 10,596 12,046 37,172 29,650
Direct operating expenses (5,611) (6,021) (14,243) (11,902)
Provision for income taxes (1,398) (3,002) (5,406) (7,422)
Net Income 9,042 7,035 29,738 18,888
Non-cash amortization income (expense), net (23) (27) (45) (54)
Corporate/Other        
Segment Reporting Information [Line Items]        
Interest income 5,323 4,976 10,288 9,880
Interest expense (13,580) (12,600) (29,094) (25,443)
Net Interest Income (8,257) (7,624) (18,806) (15,563)
Non-interest Income        
Mortgage banking activities, net 0 0 0 0
Investment fair value changes, net (711) (1,000) (692) (2,808)
Other income, net 0 0 0 0
Realized gains, net 0 (752) 0 (752)
Total non-interest income, net (711) (1,752) (692) (3,560)
Direct operating expenses (11,540) (11,166) (23,931) (21,918)
Provision for income taxes 0 0 0 0
Net Income (20,508) (20,542) (43,429) (41,041)
Non-cash amortization income (expense), net $ (814) $ (744) $ (1,672) $ (1,741)