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MBS (Details) (USD $)
Sep. 30, 2011
Unit
Security
Counterparty
Y
Jun. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Dec. 31, 2009
MBS      
Minimum term of fixed rate mortgages underlying MBS (in years)15     
Information about MBS      
Principal/ Current Face$ 12,460,560,000 $ 8,525,316,000   
Purchase Premiums184,947,000 106,163,000   
Accretable Purchase Discounts(239,849,000) (229,176,000)   
Discount Designated as Credit Reserve and OTTI(1,196,401,000) (746,678,000)   
Amortized Cost11,213,729,000 7,664,888,000   
Carrying Value/ Fair Value11,408,312,000 8,058,710,000   
Gross Unrealized Gains378,320,000 421,969,000   
Gross Unrealized Losses(183,737,000) (28,147,000)   
Net Unrealized Gain/(Loss)194,583,000292,376,000393,822,000401,518,000353,457,000339,470,000
Credit Reserve1,146,000,000 700,300,000   
OTTI50,700,000 46,400,000   
Principal payments receivable4,500,000 9,300,000   
Agency MBS
      
Information about MBS      
Principal/ Current Face7,123,051,000 5,703,827,000   
Purchase Premiums183,789,000 105,136,000   
Accretable Purchase Discounts(140,000) (210,000)   
Amortized Cost7,311,172,000 5,818,016,000   
Carrying Value/ Fair Value7,519,002,000 5,980,623,000   
Gross Unrealized Gains211,356,000 170,534,000   
Gross Unrealized Losses(3,526,000) (7,927,000)   
Net Unrealized Gain/(Loss)207,830,000 162,607,000   
Agency MBS | Fannie Mae.
      
Information about MBS      
Principal/ Current Face6,293,420,000 5,083,076,000   
Purchase Premiums159,120,000 88,654,000   
Accretable Purchase Discounts(140,000) (210,000)   
Amortized Cost6,452,400,000 5,171,520,000   
Carrying Value/ Fair Value6,635,600,000 5,323,475,000   
Gross Unrealized Gains186,548,000 157,365,000   
Gross Unrealized Losses(3,348,000) (5,410,000)   
Net Unrealized Gain/(Loss)183,200,000 151,955,000   
Agency MBS | Freddie Mac.
      
Information about MBS      
Principal/ Current Face813,340,000 602,921,000   
Purchase Premiums24,387,000 16,171,000   
Amortized Cost842,199,000 628,355,000   
Carrying Value/ Fair Value866,468,000 638,582,000   
Gross Unrealized Gains24,447,000 12,744,000   
Gross Unrealized Losses(178,000) (2,517,000)   
Net Unrealized Gain/(Loss)24,269,000 10,227,000   
Agency MBS | Ginnie Mae.
      
Information about MBS      
Principal/ Current Face16,291,000 17,830,000   
Purchase Premiums282,000 311,000   
Amortized Cost16,573,000 18,141,000   
Carrying Value/ Fair Value16,934,000 18,566,000   
Gross Unrealized Gains361,000 425,000   
Net Unrealized Gain/(Loss)361,000 425,000   
Non-Agency MBS
      
Information about MBS      
Principal/ Current Face5,337,509,000 2,821,489,000   
Purchase Premiums1,158,000 1,027,000   
Accretable Purchase Discounts(239,709,000) (228,966,000)   
Discount Designated as Credit Reserve and OTTI(1,196,401,000) (746,678,000)   
Amortized Cost3,902,557,000 1,846,872,000   
Carrying Value/ Fair Value3,889,310,000 2,078,087,000   
Gross Unrealized Gains166,964,000 251,435,000   
Gross Unrealized Losses(180,211,000) (20,220,000)   
Net Unrealized Gain/(Loss)(13,247,000) 231,215,000   
Non-Agency MBS | Rated AAA
      
Information about MBS      
Principal/ Current Face13,356,000 2,157,000   
Purchase Premiums267,000 52,000   
Amortized Cost13,623,000 2,209,000   
Carrying Value/ Fair Value13,623,000 1,994,000   
Gross Unrealized Losses  (215,000)   
Net Unrealized Gain/(Loss)  (215,000)   
Non-Agency MBS | Rated AA
      
Information about MBS      
Principal/ Current Face48,000 33,257,000   
Purchase Premiums1,000 905,000   
Accretable Purchase Discounts  (446,000)   
Amortized Cost49,000 33,716,000   
Carrying Value/ Fair Value35,000 30,805,000   
Gross Unrealized Gains  334,000   
Gross Unrealized Losses(14,000) (3,245,000)   
Net Unrealized Gain/(Loss)(14,000) (2,911,000)   
Non-Agency MBS | Rated A
      
Information about MBS      
Principal/ Current Face34,059,000 26,761,000   
Purchase Premiums797,000 43,000   
Accretable Purchase Discounts(885,000) (6,441,000)   
Discount Designated as Credit Reserve and OTTI(594,000) (1,632,000)   
Amortized Cost33,377,000 18,731,000   
Carrying Value/ Fair Value29,494,000 22,968,000   
Gross Unrealized Gains399,000 4,773,000   
Gross Unrealized Losses(4,282,000) (536,000)   
Net Unrealized Gain/(Loss)(3,883,000) 4,237,000   
Non-Agency MBS | Rated BBB
      
Information about MBS      
Principal/ Current Face58,681,000 44,313,000   
Purchase Premiums42,000 27,000   
Accretable Purchase Discounts(7,736,000) (2,329,000)   
Discount Designated as Credit Reserve and OTTI(1,111,000) (840,000)   
Amortized Cost49,876,000 41,171,000   
Carrying Value/ Fair Value49,199,000 39,468,000   
Gross Unrealized Gains2,255,000 438,000   
Gross Unrealized Losses(2,932,000) (2,141,000)   
Net Unrealized Gain/(Loss)(677,000) (1,703,000)   
Non-Agency MBS | Rated BB
      
Information about MBS      
Principal/ Current Face87,402,000 44,305,000   
Purchase Premiums33,000     
Accretable Purchase Discounts(6,290,000) (3,671,000)   
Discount Designated as Credit Reserve and OTTI(2,532,000) (2,250,000)   
Amortized Cost78,613,000 38,384,000   
Carrying Value/ Fair Value73,845,000 42,441,000   
Gross Unrealized Gains211,000 4,057,000   
Gross Unrealized Losses(4,979,000)     
Net Unrealized Gain/(Loss)(4,768,000) 4,057,000   
Non-Agency MBS | Rated B
      
Information about MBS      
Principal/ Current Face442,396,000 93,552,000   
Purchase Premiums18,000     
Accretable Purchase Discounts(38,165,000) (15,108,000)   
Discount Designated as Credit Reserve and OTTI(30,335,000) (7,173,000)   
Amortized Cost373,914,000 71,271,000   
Carrying Value/ Fair Value364,068,000 80,976,000   
Gross Unrealized Gains7,887,000 9,753,000   
Gross Unrealized Losses(17,733,000) (48,000)   
Net Unrealized Gain/(Loss)(9,846,000) 9,705,000   
Non-Agency MBS | Rated CCC
      
Information about MBS      
Principal/ Current Face1,195,769,000 764,579,000   
Accretable Purchase Discounts(80,268,000) (69,899,000)   
Discount Designated as Credit Reserve and OTTI(229,354,000) (192,503,000)   
Amortized Cost886,147,000 502,177,000   
Carrying Value/ Fair Value893,583,000 565,043,000   
Gross Unrealized Gains43,414,000 67,382,000   
Gross Unrealized Losses(35,978,000) (4,516,000)   
Net Unrealized Gain/(Loss)7,436,000 62,866,000   
Non-Agency MBS | Rated CC
      
Information about MBS      
Principal/ Current Face1,295,750,000 620,114,000   
Accretable Purchase Discounts(47,184,000) (54,361,000)   
Discount Designated as Credit Reserve and OTTI(267,554,000) (196,106,000)   
Amortized Cost981,012,000 369,647,000   
Carrying Value/ Fair Value961,899,000 432,542,000   
Gross Unrealized Gains32,853,000 63,179,000   
Gross Unrealized Losses(51,966,000) (284,000)   
Net Unrealized Gain/(Loss)(19,113,000) 62,895,000   
Non-Agency MBS | Rated C
      
Information about MBS      
Principal/ Current Face1,386,314,000 1,004,627,000   
Accretable Purchase Discounts(35,893,000) (60,308,000)   
Discount Designated as Credit Reserve and OTTI(362,101,000) (281,070,000)   
Amortized Cost988,320,000 663,249,000   
Carrying Value/ Fair Value989,877,000 745,292,000   
Gross Unrealized Gains44,666,000 88,388,000   
Gross Unrealized Losses(43,109,000) (6,345,000)   
Net Unrealized Gain/(Loss)1,557,000 82,043,000   
Non-Agency MBS | Unrated and other
      
Information about MBS      
Principal/ Current Face823,734,000 187,824,000   
Accretable Purchase Discounts(23,288,000) (16,403,000)   
Discount Designated as Credit Reserve and OTTI(302,820,000) (65,104,000)   
Amortized Cost497,626,000 106,317,000   
Carrying Value/ Fair Value513,687,000 116,558,000   
Gross Unrealized Gains35,279,000 13,131,000   
Gross Unrealized Losses(19,218,000) (2,890,000)   
Net Unrealized Gain/(Loss)16,061,000 10,241,000   
Non-Agency MBS | D-rated
      
Information about MBS      
Amortized Cost483,200,000 98,600,000   
Carrying Value/ Fair Value$ 498,500,000 $ 105,900,000   
Number of mortgage backed securities held52 13