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Residential Investment Securities - Portfolio (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Mortgage-Backed Securities Portfolio:    
Principal / Notional $ 73,074,622 $ 85,400,342
Remaining Premium 5,012,896 5,368,726
Remaining Discount (61,644) (19,576)
Amortized Cost 67,715,297 82,740,954
Unrealized Gains 500,002 [1] 982,001 [2]
Unrealized Losses (981,805) [1] (789,349) [2]
Estimated Fair Value 67,233,494 82,933,606
Agency Mortgage Backed Securities    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 70,856,126 85,400,342
Remaining Premium 4,993,883 5,368,726
Remaining Discount (10,384) (19,576)
Amortized Cost 66,340,293 82,740,954
Unrealized Gains 499,035 [1] 982,001 [2]
Unrealized Losses (969,066) [1] (789,349) [2]
Estimated Fair Value 65,870,262 82,933,606
Agency Mortgage Backed Securities | Fixed Rate Passthrough    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 57,339,705 69,907,363
Remaining Premium 3,270,521 4,018,054
Remaining Discount (2,832) (4,096)
Amortized Cost 60,607,394 73,921,321
Unrealized Gains 400,350 [1] 791,607 [2]
Unrealized Losses (824,862) [1] (667,248) [2]
Estimated Fair Value 60,182,882 74,045,680
Agency Mortgage Backed Securities | Adjustable-rate Passthrough    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 2,894,192 2,620,610
Remaining Premium 61,781 34,577
Remaining Discount (6,427) (12,574)
Amortized Cost 2,949,546 2,642,613
Unrealized Gains 70,849 [1] 126,615 [2]
Unrealized Losses (10,317) [1] (303) [2]
Estimated Fair Value 3,010,078 2,768,925
Agency Mortgage Backed Securities | CMO    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 964,095 3,455,026
Remaining Premium 27,269 85,624
Remaining Discount (477) (1,530)
Amortized Cost 990,887 3,539,120
Unrealized Gains 9,137 [1] 27,659 [2]
Unrealized Losses (12,945) [1] (38,562) [2]
Estimated Fair Value 987,079 3,528,217
Agency Mortgage Backed Securities | Debentures    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 158,802 1,408,805
Remaining Discount (648) (1,376)
Amortized Cost 158,154 1,407,429
Unrealized Losses (6,116) [1] (39,079) [2]
Estimated Fair Value 152,038 1,368,350
Agency Mortgage Backed Securities | Interest-only    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 9,499,332 8,008,538
Remaining Premium 1,634,312 1,230,471
Amortized Cost 1,634,312 1,230,471
Unrealized Gains 18,699 [1] 36,120 [2]
Unrealized Losses (114,826) [1] (44,157) [2]
Estimated Fair Value 1,538,185 $ 1,222,434
Residential Credit Securities Mortgage Backed Securities [Member]    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 2,218,496  
Remaining Premium 19,013  
Remaining Discount (51,260)  
Amortized Cost 1,375,004  
Unrealized Gains [1] 967  
Unrealized Losses [1] (12,739)  
Estimated Fair Value 1,363,232  
Residential Credit Securities Mortgage Backed Securities [Member] | CRT    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 476,084  
Remaining Premium 2,225  
Remaining Discount (12,840)  
Amortized Cost 465,469  
Unrealized Gains [1] 250  
Unrealized Losses [1] (9,209)  
Estimated Fair Value 456,510  
Residential Credit Securities Mortgage Backed Securities [Member] | Legacy    
Mortgage-Backed Securities Portfolio:    
Principal / Notional [3] 378,527  
Remaining Premium [3] 773  
Remaining Discount [3] (37,150)  
Amortized Cost [3] 342,150  
Unrealized Gains [1],[3] 698  
Unrealized Losses [1],[3] (1,140)  
Estimated Fair Value [3] 341,708  
Residential Credit Securities Mortgage Backed Securities [Member] | NPL/RPL    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 354,945  
Remaining Premium 19  
Remaining Discount (1,270)  
Amortized Cost 353,694  
Unrealized Gains [1] 19  
Unrealized Losses [1] (1,172)  
Estimated Fair Value 352,541  
Residential Credit Securities Mortgage Backed Securities [Member] | New Issue    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 197,695  
Remaining Premium 566  
Amortized Cost 198,261  
Unrealized Losses [1] (1,060)  
Estimated Fair Value 197,201  
Residential Credit Securities Mortgage Backed Securities [Member] | New Issue Interest Only    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 811,245  
Remaining Premium 15,430  
Amortized Cost 15,430  
Unrealized Losses [1] (158)  
Estimated Fair Value $ 15,272  
[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] Unrealized gains and losses on Agency mortgage-backed securities and debentures are reported through Other Comprehensive Income. Unrealized gains and losses are reported through earnings on Interest-only and New issue interest-only securities.
[3] Legacy residential credit refers to securities whose underlying collateral was securitized prior to 2009.