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Residential Investment Securities - Portfolio (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Mortgage-Backed Securities Portfolio:    
Estimated Fair Value $ 66,580,862 $ 67,233,494
Residential Credit Securities Mortgage Backed Securities    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 2,798,679 2,218,496
Remaining Premium 20,954 19,013
Remaining Discount (105,396) (51,260)
Amortized Cost 1,694,054 1,375,004
Amortized Cost 1,694,054 1,375,004
Unrealized Gains [1] 31,258 967
Unrealized Losses [1] (7,442) (12,739)
Estimated Fair Value 1,717,870 1,363,232
Residential Credit Securities Mortgage Backed Securities | CRT    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 519,387 476,084
Remaining Premium 1,878 2,225
Remaining Discount (12,415) (12,840)
Amortized Cost 508,850 465,469
Amortized Cost 508,850 465,469
Unrealized Gains [1] 12,476 250
Unrealized Losses [1] (1,005) (9,209)
Estimated Fair Value 520,321 456,510
Residential Credit Securities Mortgage Backed Securities | Legacy    
Mortgage-Backed Securities Portfolio:    
Principal / Notional [2] 690,679 378,527
Remaining Premium [2] 815 773
Remaining Discount [2] (91,368) (37,150)
Amortized Cost [2] 600,126 342,150
Amortized Cost [2] 600,126 342,150
Unrealized Gains [1],[2] 12,553 698
Unrealized Losses [1],[2] (924) (1,140)
Estimated Fair Value [2] 611,755 341,708
Residential Credit Securities Mortgage Backed Securities | NPL/RPL    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 374,096 354,945
Remaining Premium 65 19
Remaining Discount (1,240) (1,270)
Amortized Cost 372,921 353,694
Amortized Cost 372,921 353,694
Unrealized Gains [1] 1,785 19
Unrealized Losses [1] (82) (1,172)
Estimated Fair Value 374,624 352,541
Residential Credit Securities Mortgage Backed Securities | New Issue    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 194,334 197,695
Remaining Premium 973 566
Remaining Discount (373)  
Amortized Cost 194,934 198,261
Amortized Cost 194,934 198,261
Unrealized Gains [1] 4,444  
Unrealized Losses [1]   (1,060)
Estimated Fair Value 199,378 197,201
Residential Credit Securities Mortgage Backed Securities | New Issue Interest Only    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 1,020,183 811,245
Remaining Premium 17,223 15,430
Amortized Cost 17,223 15,430
Amortized Cost 17,223 15,430
Unrealized Losses [1] (5,431) (158)
Estimated Fair Value 11,792 15,272
Agency Securities [Member]    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 68,285,177 70,856,126
Remaining Premium 4,718,610 4,993,883
Remaining Discount (7,620) (10,384)
Amortized Cost 63,934,399 66,340,293
Amortized Cost 63,934,399 66,340,293
Unrealized Gains [1] 1,191,361 499,035
Unrealized Losses [1] (262,768) (969,066)
Estimated Fair Value 64,862,992 65,870,262
Agency Securities [Member] | Fixed Rate Pass-through    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 55,843,681 57,339,705
Remaining Premium 3,073,647 3,270,521
Remaining Discount (2,017) (2,832)
Amortized Cost 58,915,311 60,607,394
Amortized Cost 58,915,311 60,607,394
Unrealized Gains [1] 1,080,129 400,350
Unrealized Losses [1] (55,271) (824,862)
Estimated Fair Value 59,940,169 60,182,882
Agency Securities [Member] | Adjustable-rate Pass-through    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 2,906,239 2,894,192
Remaining Premium 62,572 61,781
Remaining Discount (5,173) (6,427)
Amortized Cost 2,963,638 2,949,546
Amortized Cost 2,963,638 2,949,546
Unrealized Gains [1] 77,317 70,849
Unrealized Losses [1]   (10,317)
Estimated Fair Value 3,040,955 3,010,078
Agency Securities [Member] | CMO    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 473,489 964,095
Remaining Premium 9,860 27,269
Remaining Discount (430) (477)
Amortized Cost 482,919 990,887
Amortized Cost 482,919 990,887
Unrealized Gains [1] 15,080 9,137
Unrealized Losses [1] (252) (12,945)
Estimated Fair Value 497,747 987,079
Agency Securities [Member] | Debentures    
Mortgage-Backed Securities Portfolio:    
Principal / Notional   158,802
Remaining Discount   (648)
Amortized Cost   158,154
Amortized Cost   158,154
Unrealized Losses [1]   (6,116)
Estimated Fair Value   152,038
Agency Securities [Member] | Interest-only    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 9,061,768 9,499,332
Remaining Premium 1,572,531 1,634,312
Amortized Cost 1,572,531 1,634,312
Amortized Cost 1,572,531 1,634,312
Unrealized Gains [1] 18,835 18,699
Unrealized Losses [1] (207,245) (114,826)
Estimated Fair Value 1,384,121 1,538,185
Residential Investments [Member]    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 71,083,856 73,074,622
Remaining Premium 4,739,564 5,012,896
Remaining Discount (113,016) (61,644)
Amortized Cost 65,628,453 67,715,297
Amortized Cost 65,628,453 67,715,297
Unrealized Gains [1] 1,222,619 500,002
Unrealized Losses [1] (270,210) (981,805)
Estimated Fair Value $ 66,580,862 $ 67,233,494
[1] Unrealized gains and losses on Agency investments, excluding interest-only investments, are reported as a component of other comprehensive income (loss). Unrealized gains and losses on residential credit investments and Agency interest-only investments are generally reported in Net unrealized gains (losses) on financial instruments measured at fair value through earnings in the Consolidated Statements of Comprehensive Income (Loss).
[2] Legacy residential credit refers to securities whose underlying collateral was securitized prior to 2009.