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Segment Information - Financial Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Interest income $ 62,737 $ 60,906 $ 176,589 $ 190,021
Interest expense (27,443) (21,597) (72,708) (67,991)
Net Interest Income 35,294 39,309 103,881 122,030
Reversal of provision for loan losses 0 859 0 7,102
Non-interest Income        
Mortgage banking activities, net 21,200 9,766 50,850 24,712
MSR income, net 1,615 3,770 6,106 12,834
Investment fair value changes, net 324 11,918 9,990 (18,686)
Other income 1,197 1,643 3,367 4,157
Realized gains, net 1,734 6,615 8,809 26,037
Total non-interest income, net 26,070 33,712 79,122 49,054
Direct operating expenses (19,922) (20,355) (56,789) (70,962)
Provision for income taxes (5,262) (972) (16,741) (1,327)
Net Income 36,180 52,553 109,473 105,897
Non-cash amortization income (expense) 4,410 5,112 13,656 17,427
Operating Segments | Investment Portfolio        
Segment Reporting Information [Line Items]        
Interest income 47,023 47,176 135,106 149,985
Interest expense (9,445) (5,013) (21,940) (18,679)
Net Interest Income 37,578 42,163 113,166 131,306
Reversal of provision for loan losses   859   7,102
Non-interest Income        
Mortgage banking activities, net 0 0 0 0
MSR income, net 1,615 3,770 6,106 12,834
Investment fair value changes, net 1,372 12,176 13,846 (16,505)
Other income 1,197 1,643 3,367 4,157
Realized gains, net 1,734 6,615 9,561 25,745
Total non-interest income, net 5,918 24,204 32,880 26,231
Direct operating expenses (1,324) (2,751) (4,371) (7,689)
Provision for income taxes (433) (732) (4,490) (1,087)
Net Income 41,739 63,743 137,185 155,863
Non-cash amortization income (expense) 5,222 6,123 16,263 20,507
Operating Segments | Residential Mortgage Banking        
Segment Reporting Information [Line Items]        
Interest income 10,626 8,831 26,515 24,610
Interest expense (4,135) (3,826) (11,462) (10,719)
Net Interest Income 6,491 5,005 15,053 13,891
Reversal of provision for loan losses   0   0
Non-interest Income        
Mortgage banking activities, net 21,200 9,766 50,850 26,774
MSR income, net 0 0 0 0
Investment fair value changes, net 0 0 0 0
Other income 0 0 0 0
Realized gains, net 0 0 0 0
Total non-interest income, net 21,200 9,766 50,850 26,774
Direct operating expenses (6,107) (5,807) (18,009) (17,175)
Provision for income taxes (4,829) (240) (12,251) (240)
Net Income 16,755 8,724 35,643 23,250
Non-cash amortization income (expense) (25) (28) (79) (102)
Corporate/Other        
Segment Reporting Information [Line Items]        
Interest income 5,088 4,899 14,968 15,426
Interest expense (13,863) (12,758) (39,306) (38,593)
Net Interest Income (8,775) (7,859) (24,338) (23,167)
Reversal of provision for loan losses   0   0
Non-interest Income        
Mortgage banking activities, net 0 0 0 (2,062)
MSR income, net 0 0 0 0
Investment fair value changes, net (1,048) (258) (3,856) (2,181)
Other income 0 0 0 0
Realized gains, net 0 0 (752) 292
Total non-interest income, net (1,048) (258) (4,608) (3,951)
Direct operating expenses (12,491) (11,797) (34,409) (46,098)
Provision for income taxes 0 0 0 0
Net Income (22,314) (19,914) (63,355) (73,216)
Non-cash amortization income (expense) $ (787) $ (983) $ (2,528) $ (2,978)