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Segment Information - Financial Information by Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Interest income $ 62,328 $ 63,746
Interest expense (23,950) (23,961)
Net Interest Income 38,378 39,785
Provision for loan losses (289) (206)
Mortgage banking activities, net 7,218 1,923
MSR income (loss), net 6,281 (10,924)
Investment fair value changes, net (19,538) (1,145)
Other income 955 809
Realized gains, net 9,538 4,306
Total non-interest income (loss), net 4,454 (5,031)
Direct operating expenses (30,452) (25,063)
Provision for income taxes (28) 5,316
Net Income 12,063 14,801
Non-cash amortization income (expense) 7,019 8,762
Operating Segments | Residential Mortgage Banking    
Segment Reporting Information [Line Items]    
Interest income 7,869 15,795
Interest expense (3,289) (3,778)
Net Interest Income 4,580 12,017
Provision for loan losses 0 0
Mortgage banking activities, net 9,280 2,215
MSR income (loss), net 0 0
Investment fair value changes, net 0 2
Other income 0 0
Realized gains, net 0 0
Total non-interest income (loss), net 9,280 2,217
Direct operating expenses (5,321) (10,903)
Provision for income taxes 0 8
Net Income 8,539 3,339
Non-cash amortization income (expense) (43) (46)
Operating Segments | Residential Investments    
Segment Reporting Information [Line Items]    
Interest income 39,936 30,012
Interest expense (4,953) (2,810)
Net Interest Income 34,983 27,202
Provision for loan losses 0 0
Mortgage banking activities, net 0 0
MSR income (loss), net 6,281 (10,924)
Investment fair value changes, net (17,765) (19)
Other income 955 809
Realized gains, net 9,246 4,306
Total non-interest income (loss), net (1,283) (5,828)
Direct operating expenses (1,861) (1,118)
Provision for income taxes (28) 3,510
Net Income 31,811 23,766
Non-cash amortization income (expense) 8,068 9,838
Operating Segments | Commercial Mortgage Banking and Investments    
Segment Reporting Information [Line Items]    
Interest income 9,581 10,914
Interest expense (2,952) (3,489)
Net Interest Income 6,629 7,425
Provision for loan losses (289) (206)
Mortgage banking activities, net (2,062) (292)
MSR income (loss), net 0 0
Investment fair value changes, net (137) 0
Other income 0 0
Realized gains, net 0 0
Total non-interest income (loss), net (2,199) (292)
Direct operating expenses (1,602) (3,482)
Provision for income taxes 0 853
Net Income 2,539 4,298
Non-cash amortization income (expense) (16) (49)
Corporate/Other    
Segment Reporting Information [Line Items]    
Interest income 4,942 7,025
Interest expense (12,756) (13,884)
Net Interest Income (7,814) (6,859)
Provision for loan losses 0 0
Mortgage banking activities, net 0 0
MSR income (loss), net 0 0
Investment fair value changes, net (1,636) (1,128)
Other income 0 0
Realized gains, net 292 0
Total non-interest income (loss), net (1,344) (1,128)
Direct operating expenses (21,668) (9,560)
Provision for income taxes 0 945
Net Income (30,826) (16,602)
Non-cash amortization income (expense) $ (990) $ (981)