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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Interest income $ 54,628 $ 62,328
Interest expense (21,031) (23,950)
Net Interest Income 33,597 38,378
Provision for loan losses 0 (289)
Mortgage banking activities, net 17,604 7,218
MSR income, net 1,713 6,281
Investment fair value changes, net 1,551 (19,538)
Other income 1,184 955
Realized gains, net 5,703 9,538
Total non-interest income, net 27,755 4,454
Direct operating expenses (18,226) (30,452)
Provision for income taxes (6,157) (28)
Net Income 36,969 12,063
Non-cash amortization income (expense) 4,823 7,019
Operating Segments | Investment Portfolio    
Segment Reporting Information [Line Items]    
Interest income 42,250 48,763
Interest expense (5,264) (7,507)
Net Interest Income 36,986 41,256
Provision for loan losses 0 (289)
Mortgage banking activities, net 0 0
MSR income, net 1,713 6,281
Investment fair value changes, net 3,359 (17,902)
Other income 1,184 955
Realized gains, net 5,703 9,246
Total non-interest income, net 11,959 (1,420)
Direct operating expenses (1,593) (2,111)
Provision for income taxes (1,737) (28)
Net Income 45,615 37,408
Non-cash amortization income (expense) 5,847 8,052
Operating Segments | Residential Mortgage Banking    
Segment Reporting Information [Line Items]    
Interest income 7,474 7,869
Interest expense (2,924) (3,289)
Net Interest Income 4,550 4,580
Provision for loan losses 0 0
Mortgage banking activities, net 17,604 9,280
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 17,604 9,280
Direct operating expenses (5,881) (5,321)
Provision for income taxes (4,420) 0
Net Income 11,853 8,539
Non-cash amortization income (expense) (27) (43)
Corporate/Other    
Segment Reporting Information [Line Items]    
Interest income 4,904 5,696
Interest expense (12,843) (13,154)
Net Interest Income (7,939) (7,458)
Provision for loan losses 0 0
Mortgage banking activities, net 0 (2,062)
MSR income, net 0 0
Investment fair value changes, net (1,808) (1,636)
Other income 0 0
Realized gains, net 0 292
Total non-interest income, net (1,808) (3,406)
Direct operating expenses (10,752) (23,020)
Provision for income taxes 0 0
Net Income (20,499) (33,884)
Non-cash amortization income (expense) $ (997) $ (990)