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Residential Investment Securities - Portfolio (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mortgage-Backed Securities Portfolio:    
Estimated Fair Value $ 67,255,533 $ 67,233,494
Residential Credit Securities Mortgage Backed Securities [Member]    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 2,824,941 2,218,496
Remaining Premium 21,571 19,013
Remaining Discount (69,970) (51,260)
Amortized Cost 1,662,308 1,375,004
Amortized Cost 1,662,308 1,375,004
Unrealized Gains [1] 8,579 967
Unrealized Losses [1] (12,213) (12,739)
Estimated Fair Value 1,658,674 1,363,232
Residential Credit Securities Mortgage Backed Securities [Member] | CRT    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 517,207 476,084
Remaining Premium 1,586 2,225
Remaining Discount (14,763) (12,840)
Amortized Cost 504,030 465,469
Amortized Cost 504,030 465,469
Unrealized Gains [1] 3,138 250
Unrealized Losses [1] (6,001) (9,209)
Estimated Fair Value 501,167 456,510
Residential Credit Securities Mortgage Backed Securities [Member] | Legacy    
Mortgage-Backed Securities Portfolio:    
Principal / Notional [2] 484,784 378,527
Remaining Premium [2] 879 773
Remaining Discount [2] (52,182) (37,150)
Amortized Cost [2] 433,481 342,150
Amortized Cost [2] 433,481 342,150
Unrealized Gains [1],[2] 1,251 698
Unrealized Losses [1],[2] (4,306) (1,140)
Estimated Fair Value [2] 430,426 341,708
Residential Credit Securities Mortgage Backed Securities [Member] | NPL/RPL    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 428,656 354,945
Remaining Premium 50 19
Remaining Discount (1,579) (1,270)
Amortized Cost 427,127 353,694
Amortized Cost 427,127 353,694
Unrealized Gains [1] 153 19
Unrealized Losses [1] (941) (1,172)
Estimated Fair Value 426,339 352,541
Residential Credit Securities Mortgage Backed Securities [Member] | New Issue    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 280,060 197,695
Remaining Premium 1,233 566
Remaining Discount (1,446)  
Amortized Cost 279,847 198,261
Amortized Cost 279,847 198,261
Unrealized Gains [1] 3,713  
Unrealized Losses [1]   (1,060)
Estimated Fair Value 283,560 197,201
Residential Credit Securities Mortgage Backed Securities [Member] | New Issue Interest Only    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 1,114,234 811,245
Remaining Premium 17,823 15,430
Amortized Cost 17,823 15,430
Amortized Cost 17,823 15,430
Unrealized Gains [1] 324  
Unrealized Losses [1] (965) (158)
Estimated Fair Value 17,182 15,272
Agency Securities [Member]    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 69,628,365 70,856,126
Remaining Premium 4,800,690 4,993,883
Remaining Discount (10,391) (10,384)
Amortized Cost 65,056,068 66,340,293
Amortized Cost 65,056,068 66,340,293
Unrealized Gains [1] 887,006 499,035
Unrealized Losses [1] (346,215) (969,066)
Estimated Fair Value 65,596,859 65,870,262
Agency Securities [Member] | Fixed Rate Pass-through    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 56,120,429 57,339,705
Remaining Premium 3,093,155 3,270,521
Remaining Discount (2,392) (2,832)
Amortized Cost 59,211,192 60,607,394
Amortized Cost 59,211,192 60,607,394
Unrealized Gains [1] 765,776 400,350
Unrealized Losses [1] (204,912) (824,862)
Estimated Fair Value 59,772,056 60,182,882
Agency Securities [Member] | Adjustable-rate Pass-through    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 3,064,341 2,894,192
Remaining Premium 68,241 61,781
Remaining Discount (6,974) (6,427)
Amortized Cost 3,125,608 2,949,546
Amortized Cost 3,125,608 2,949,546
Unrealized Gains [1] 70,485 70,849
Unrealized Losses [1] (220) (10,317)
Estimated Fair Value 3,195,873 3,010,078
Agency Securities [Member] | CMO    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 922,196 964,095
Remaining Premium 24,962 27,269
Remaining Discount (387) (477)
Amortized Cost 946,771 990,887
Amortized Cost 946,771 990,887
Unrealized Gains [1] 16,943 9,137
Unrealized Losses [1] (4,417) (12,945)
Estimated Fair Value 959,297 987,079
Agency Securities [Member] | Debentures    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 158,803 158,802
Remaining Discount (638) (648)
Amortized Cost 158,165 158,154
Amortized Cost 158,165 158,154
Unrealized Losses [1] (1,130) (6,116)
Estimated Fair Value 157,035 152,038
Agency Securities [Member] | Interest-only    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 9,362,596 9,499,332
Remaining Premium 1,614,332 1,634,312
Amortized Cost 1,614,332 1,634,312
Amortized Cost 1,614,332 1,634,312
Unrealized Gains [1] 33,802 18,699
Unrealized Losses [1] (135,536) (114,826)
Estimated Fair Value 1,512,598 1,538,185
Residential Investments [Member]    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 72,453,306 73,074,622
Remaining Premium 4,822,261 5,012,896
Remaining Discount (80,361) (61,644)
Amortized Cost 66,718,376 67,715,297
Amortized Cost 66,718,376 67,715,297
Unrealized Gains [1] 895,585 500,002
Unrealized Losses [1] (358,428) (981,805)
Estimated Fair Value $ 67,255,533 $ 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 securities 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.