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Segment Information - Financial Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Segment Reporting Information [Line Items] |  |  |  |
Interest income | $ 66,787 | $ 63,373 | $ 129,115 | $ 127,119
Interest expense | (22,444) | (23,008) | (46,394) | (46,969)
Net Interest Income | 44,343 | 40,365 | 82,721 | 80,150
Reversal of provision for loan losses | 6,532 | 261 | 6,243 | 55
Mortgage banking activities, net | 7,728 | 7,447 | 14,946 | 9,373
MSR income (loss), net | 2,783 | 830 | 9,064 | (10,094)
Investment fair value changes, net | (11,066) | (1,788) | (30,604) | (2,936)
Other income | 1,559 | 1,299 | 2,514 | 2,108
Realized gains, net | 9,884 | 6,316 | 19,422 | 10,622
Total non-interest income (loss), net | 10,888 | 14,104 | 15,342 | 9,073
Direct operating expenses | (20,155) | (25,218) | (50,607) | (50,281)
(Provision for) benefit from income taxes | (327) | (2,448) | (355) | 2,868
Net Income | 41,281 | 27,064 | 53,344 | 41,865
Non-cash amortization income (expense) | 5,296 | 8,207 | 12,315 | 16,968
Operating Segments | Residential Mortgage Banking |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 7,910 | 9,976 | 15,779 | 25,771
Interest expense | (3,604) | (3,298) | (6,893) | (7,076)
Net Interest Income | 4,306 | 6,678 | 8,886 | 18,695
Reversal of provision for loan losses | 0 | 0 | 0 | 0
Mortgage banking activities, net | 7,728 | 4,833 | 17,008 | 7,052
MSR income (loss), 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 (loss), net | 7,728 | 4,833 | 17,008 | 7,052
Direct operating expenses | (6,047) | (11,033) | (11,368) | (21,936)
(Provision for) benefit from income taxes | 0 | 865 | 0 | 872
Net Income | 5,987 | 1,343 | 14,526 | 4,683
Non-cash amortization income (expense) | (31) | (44) | (74) | (90)
Operating Segments | Residential Investments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 40,895 | 34,249 | 80,831 | 64,261
Interest expense | (4,652) | (2,660) | (9,605) | (5,469)
Net Interest Income | 36,243 | 31,589 | 71,226 | 58,792
Reversal of provision for loan losses | 0 | 0 | 0 | 0
Mortgage banking activities, net | 0 | 0 | 0 | 0
MSR income (loss), net | 2,783 | 830 | 9,064 | (10,094)
Investment fair value changes, net | (11,121) | (1,104) | (28,886) | (1,123)
Other income | 1,532 | 1,299 | 2,487 | 2,108
Realized gains, net | 10,075 | 6,316 | 19,321 | 10,622
Total non-interest income (loss), net | 3,269 | 7,341 | 1,986 | 1,513
Direct operating expenses | (2,158) | (1,171) | (4,019) | (2,289)
(Provision for) benefit from income taxes | (327) | (3,768) | (355) | (258)
Net Income | 37,027 | 33,991 | 68,838 | 57,758
Non-cash amortization income (expense) | 6,339 | 9,324 | 14,407 | 19,162
Operating Segments | Commercial Mortgage Banking and Investments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 13,151 | 12,679 | 22,732 | 23,593
Interest expense | (1,507) | (3,497) | (4,459) | (6,986)
Net Interest Income | 11,644 | 9,182 | 18,273 | 16,607
Reversal of provision for loan losses | 6,532 | 261 | 6,243 | 55
Mortgage banking activities, net | 0 | 2,614 | (2,062) | 2,321
MSR income (loss), net | 0 | 0 | 0 | 0
Investment fair value changes, net | 342 | 0 | 205 | 0
Other income | 27 | 0 | 27 | 0
Realized gains, net | (191) | 0 | (191) | 0
Total non-interest income (loss), net | 178 | 2,614 | (2,021) | 2,321
Direct operating expenses | (669) | (3,020) | (2,271) | (6,502)
(Provision for) benefit from income taxes | 0 | (143) | 0 | 710
Net Income | 17,685 | 8,894 | 20,224 | 13,191
Non-cash amortization income (expense) | (7) | (78) | (23) | (128)
Corporate/Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest income | 4,831 | 6,469 | 9,773 | 13,494
Interest expense | (12,681) | (13,553) | (25,437) | (27,438)
Net Interest Income | (7,850) | (7,084) | (15,664) | (13,944)
Reversal of provision for loan losses | 0 | 0 | 0 | 0
Mortgage banking activities, net | 0 | 0 | 0 | 0
MSR income (loss), net | 0 | 0 | 0 | 0
Investment fair value changes, net | (287) | (684) | (1,923) | (1,813)
Other income | 0 | 0 | 0 | 0
Realized gains, net | 0 | 0 | 292 | 0
Total non-interest income (loss), net | (287) | (684) | (1,631) | (1,813)
Direct operating expenses | (11,281) | (9,994) | (32,949) | (19,554)
(Provision for) benefit from income taxes | 0 | 598 | 0 | 1,544
Net Income | (19,418) | (17,164) | (50,244) | (33,767)
Non-cash amortization income (expense) | $ (1,005) | $ (995) | $ (1,995) | $ (1,976)

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