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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Interest income $ 76,619 $ 54,628
Interest expense (41,514) (21,031)
Net Interest Income 35,105 33,597
Non-interest Income    
Mortgage banking activities, net 26,576 17,604
MSR income, net 957 1,713
Investment fair value changes, net 1,609 1,551
Other income 1,161 1,184
Realized gains, net 9,363 5,703
Total non-interest income, net 39,666 27,755
Direct operating expenses (23,030) (18,226)
Provision for income taxes (4,896) (6,157)
Net Income 46,845 36,969
Non-cash amortization income (expense), net 3,737 4,823
Operating Segments | Investment Portfolio    
Segment Reporting Information [Line Items]    
Interest income 58,757 42,250
Interest expense (19,863) (5,264)
Net Interest Income 38,894 36,986
Non-interest Income    
Mortgage banking activities, net 0 0
MSR income, net 957 1,713
Investment fair value changes, net 1,590 3,359
Other income 1,161 1,184
Realized gains, net 9,363 5,703
Total non-interest income, net 13,071 11,959
Direct operating expenses (2,007) (1,593)
Provision for income taxes (888) (1,737)
Net Income 49,070 45,615
Non-cash amortization income (expense), net 4,617 5,847
Operating Segments | Residential Mortgage Banking    
Segment Reporting Information [Line Items]    
Interest income 12,897 7,474
Interest expense (6,137) (2,924)
Net Interest Income 6,760 4,550
Non-interest Income    
Mortgage banking activities, net 26,576 17,604
MSR income, net 0 0
Investment fair value changes, net 0 0
Other income 0 0
Realized gains, net 0 0
Total non-interest income, net 26,576 17,604
Direct operating expenses (8,632) (5,881)
Provision for income taxes (4,008) (4,420)
Net Income 20,696 11,853
Non-cash amortization income (expense), net (22) (27)
Corporate/Other    
Segment Reporting Information [Line Items]    
Interest income 4,965 4,904
Interest expense (15,514) (12,843)
Net Interest Income (10,549) (7,939)
Non-interest Income    
Mortgage banking activities, net 0 0
MSR income, net 0 0
Investment fair value changes, net 19 (1,808)
Other income 0 0
Realized gains, net 0 0
Total non-interest income, net 19 (1,808)
Direct operating expenses (12,391) (10,752)
Provision for income taxes 0 0
Net Income (22,921) (20,499)
Non-cash amortization income (expense), net $ (858) $ (997)