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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Segment Reporting Information [Line Items]    
Interest income $ 131,041 $ 76,619
Total Interest Expense (99,276) (41,514)
Net Interest Income 31,765 35,105
Non-interest Income    
Mortgage banking activities, net 12,309 26,576
Investment fair value changes, net 20,159 1,609
Other income (expense), net 3,587 2,118
Realized gains, net 10,686 9,363
Total non-interest income, net 46,741 39,666
Direct operating expenses (23,159) (23,030)
Provision for income taxes (883) (4,896)
Net Income 54,464 46,845
Non-cash amortization income (expense), net 345 3,641
Operating Segments | Investment Portfolio    
Segment Reporting Information [Line Items]    
Interest income 115,452 58,757
Total Interest Expense (77,887) (19,863)
Net Interest Income 37,565 38,894
Non-interest Income    
Mortgage banking activities, net 0 0
Investment fair value changes, net 20,556 1,590
Other income (expense), net 1,221 2,118
Realized gains, net 10,686 9,363
Total non-interest income, net 32,463 13,071
Direct operating expenses (2,661) (2,007)
Provision for income taxes (342) (888)
Net Income 67,025 49,070
Non-cash amortization income (expense), net 2,368 4,617
Operating Segments | Mortgage Banking    
Segment Reporting Information [Line Items]    
Interest income 10,377 12,897
Total Interest Expense (5,564) (6,137)
Net Interest Income 4,813 6,760
Non-interest Income    
Mortgage banking activities, net 12,309 26,576
Investment fair value changes, net 0 0
Other income (expense), net (167) 0
Realized gains, net 0 0
Total non-interest income, net 12,142 26,576
Direct operating expenses (8,104) (8,632)
Provision for income taxes (541) (4,008)
Net Income 8,310 20,696
Non-cash amortization income (expense), net (723) (22)
Corporate/Other    
Segment Reporting Information [Line Items]    
Interest income 5,212 4,965
Total Interest Expense (15,825) (15,514)
Net Interest Income (10,613) (10,549)
Non-interest Income    
Mortgage banking activities, net 0 0
Investment fair value changes, net (397) 19
Other income (expense), net 2,533 0
Realized gains, net 0 0
Total non-interest income, net 2,136 19
Direct operating expenses (12,394) (12,391)
Provision for income taxes 0 0
Net Income (20,871) (22,921)
Non-cash amortization income (expense), net $ (1,300) $ (954)