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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)

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