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Residential Investment Securities - Portfolio (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Mortgage-Backed Securities Portfolio:    
Amortized Cost $ 76,717,611 $ 78,939,815
Amortized Cost 76,717,611 78,939,815
Estimated Fair Value 75,803,877 77,715,902
Residential Credit Securities Mortgage Backed Securities    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 2,626,623 3,072,383
Remaining Premium 32,118 29,499
Remaining Discount (147,628) (165,899)
Amortized Cost 1,718,082 2,072,613
Amortized Cost 1,718,082 2,072,613
Unrealized Gains [1] 122,048 58,666
Unrealized Losses [1] (252) (5,250)
Estimated Fair Value 1,839,879 2,126,029
Residential Credit Securities Mortgage Backed Securities | CRT    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 550,302 690,491
Remaining Premium 15,364 11,113
Remaining Discount (5,915) (10,907)
Amortized Cost 559,751 690,697
Amortized Cost 559,751 690,697
Unrealized Gains [1] 46,077 34,046
Unrealized Losses [1] (2) (21)
Estimated Fair Value 605,826 724,722
Residential Credit Securities Mortgage Backed Securities | Alt-A    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 215,364 173,108
Remaining Premium 1,255 1,068
Remaining Discount (34,464) (23,039)
Amortized Cost 182,155 151,137
Amortized Cost 182,155 151,137
Unrealized Gains [1] 11,475 3,721
Unrealized Losses [1] (149) (685)
Estimated Fair Value 193,481 154,173
Residential Credit Securities Mortgage Backed Securities | Prime    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 198,358 248,176
Remaining Premium 264 287
Remaining Discount (26,268) (35,068)
Amortized Cost 172,355 213,395
Amortized Cost 172,355 213,395
Unrealized Gains [1] 16,497 7,050
Unrealized Losses [1]   (253)
Estimated Fair Value 188,852 220,192
Residential Credit Securities Mortgage Backed Securities | Subprime    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 630,337 697,983
Remaining Premium 1,560 380
Remaining Discount (80,889) (96,331)
Amortized Cost 551,008 602,032
Amortized Cost 551,008 602,032
Unrealized Gains [1] 43,683 12,578
Unrealized Losses [1] (65) (1,061)
Estimated Fair Value 594,627 613,549
Residential Credit Securities Mortgage Backed Securities | NPL/RPL    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 128,766 269,802
Remaining Premium 168 670
Remaining Discount (92) (209)
Amortized Cost 128,841 270,263
Amortized Cost 128,841 270,263
Unrealized Gains [1] 815 1,004
Unrealized Losses [1] (36) (429)
Estimated Fair Value 129,620 270,838
Residential Credit Securities Mortgage Backed Securities | Prime Jumbo (>= 2010 Vintage)    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 110,465 129,453
Remaining Premium 675 852
Remaining Discount   (345)
Amortized Cost 111,140 129,960
Amortized Cost 111,140 129,960
Unrealized Gains [1] 1,356 267
Unrealized Losses [1]   (308)
Estimated Fair Value 112,496 129,919
Residential Credit Securities Mortgage Backed Securities | Prime Jumbo (>= 2010 Vintage) Interest-Only    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 793,031 863,370
Remaining Premium 12,832 15,129
Amortized Cost 12,832 15,129
Amortized Cost 12,832 15,129
Unrealized Gains [1] 2,145  
Unrealized Losses [1]   (2,493)
Estimated Fair Value 14,977 12,636
Agency Securities    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 76,771,790 79,546,231
Remaining Premium 5,283,970 5,460,813
Remaining Discount (4,355) (6,037)
Amortized Cost 74,999,529 76,867,202
Amortized Cost 74,999,529 76,867,202
Unrealized Gains [1] 250,474 279,905
Unrealized Losses [1] (1,286,006) (1,557,234)
Estimated Fair Value 73,963,998 75,589,873
Agency Securities | Fixed Rate Pass-through    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 61,627,012 60,759,317
Remaining Premium 3,671,722 3,633,354
Remaining Discount (1,416) (1,956)
Amortized Cost 65,297,318 64,390,715
Amortized Cost 65,297,318 64,390,715
Unrealized Gains [1] 220,370 228,430
Unrealized Losses [1] (1,045,902) (1,307,771)
Estimated Fair Value 64,471,787 63,311,373
Agency Securities | Adjustable-rate Pass-through    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 8,092,902 10,653,109
Remaining Premium 307,181 391,267
Remaining Discount (2,939) (4,081)
Amortized Cost 8,397,144 11,040,295
Amortized Cost 8,397,144 11,040,295
Unrealized Gains [1] 26,753 47,250
Unrealized Losses [1] (55,019) (53,795)
Estimated Fair Value 8,368,878 11,033,751
Agency Securities | Interest-only    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 7,051,876 8,133,805
Remaining Premium 1,305,067 1,436,192
Amortized Cost 1,305,067 1,436,192
Amortized Cost 1,305,067 1,436,192
Unrealized Gains [1] 3,351 4,225
Unrealized Losses [1] (185,085) (195,668)
Estimated Fair Value 1,123,333 1,244,749
Residential Investments    
Mortgage-Backed Securities Portfolio:    
Principal / Notional 79,398,413 82,618,614
Remaining Premium 5,316,088 5,490,312
Remaining Discount (151,983) (171,936)
Amortized Cost 76,717,611 78,939,815
Amortized Cost 76,717,611 78,939,815
Unrealized Gains [1] 372,522 338,571
Unrealized Losses [1] (1,286,258) (1,562,484)
Estimated Fair Value $ 75,803,877 $ 77,715,902
[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 reported in Net unrealized gains (losses) on investments measured at fair value through earnings in the Consolidated Statements of Comprehensive Income (Loss).