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Agency Securities, Available for Sale (Details) - Unrealized Gain or Loss Position and Components of Carrying Value of Available for Sale Agency Securities (June 30, 2013) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 16,895,719 $ 14,838,658
Gross Unrealized Loss (53,764) (197,828)
Gross Unrealized Gain 120,179 7,348
Fair Value 16,962,134 14,648,178
Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 100.00% 100.00%
Fannie Mae
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 14,474,265 10,928,093
Gross Unrealized Loss (29,798) (124,825)
Gross Unrealized Gain 108,906 3,512
Fair Value 14,553,373 10,806,780
Fannie Mae | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 85.79% 73.79%
Fannie Mae | ARMs & Hybrids
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 46,089 55,266
Gross Unrealized Loss (323) (48)
Gross Unrealized Gain 759 1,174
Fair Value 46,525 56,392
Fannie Mae | ARMs & Hybrids | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 0.27% 0.40%
Fannie Mae | Multi-Family MBS
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 480,190  
Gross Unrealized Loss (229)  
Gross Unrealized Gain 5,767  
Fair Value 485,728  
Fannie Mae | Multi-Family MBS | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 2.86%  
Fannie Mae | 10 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 4,295 1,144
Gross Unrealized Loss (1) 0
Gross Unrealized Gain 213 25
Fair Value 4,507 1,169
Fannie Mae | 10 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 0.03% 0.01%
Fannie Mae | 15 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 11,199,040 2,556,986
Gross Unrealized Loss (257) (20,420)
Gross Unrealized Gain 89,570 2,257
Fair Value 11,288,353 2,538,823
Fannie Mae | 15 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 66.55% 17.33%
Fannie Mae | 20 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,744,651 2,876,743
Gross Unrealized Loss (28,988) (104,357)
Gross Unrealized Gain 12,597 56
Fair Value 2,728,260 2,772,442
Fannie Mae | 20 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 16.08% 18.93%
Fannie Mae | 25 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   207,946
Gross Unrealized Loss   0
Gross Unrealized Gain   0
Fair Value   207,946
Fannie Mae | 25 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk   1.42%
Fannie Mae | 30 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   5,230,008
Gross Unrealized Loss   0
Gross Unrealized Gain   0
Fair Value   5,230,008
Fannie Mae | 30 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk   35.70%
Freddie Mac
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,298,298 3,764,585
Gross Unrealized Loss (23,615) (72,939)
Gross Unrealized Gain 10,307 2,684
Fair Value 2,284,990 3,694,330
Freddie Mac | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 13.48% 25.21%
Freddie Mac | ARMs & Hybrids
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 16,247 17,281
Gross Unrealized Loss (74) (29)
Gross Unrealized Gain 342 428
Fair Value 16,515 17,680
Freddie Mac | ARMs & Hybrids | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 0.10% 0.12%
Freddie Mac | 10 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 328 406
Gross Unrealized Loss (5) (6)
Gross Unrealized Gain 4 2
Fair Value 327 402
Freddie Mac | 10 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 0.00% 0.00%
Freddie Mac | 15 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 270,249 295,357
Gross Unrealized Loss (596) (3,287)
Gross Unrealized Gain 2,776 1,560
Fair Value 272,429 293,630
Freddie Mac | 15 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 1.61% 2.00%
Freddie Mac | 20 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,011,474 2,093,482
Gross Unrealized Loss (22,940) (69,617)
Gross Unrealized Gain 7,185 694
Fair Value 1,995,719 2,024,559
Freddie Mac | 20 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 11.77% 13.82%
Freddie Mac | 25 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   67,436
Gross Unrealized Loss   0
Gross Unrealized Gain   0
Fair Value   67,436
Freddie Mac | 25 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk   0.46%
Freddie Mac | 30 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost   1,290,623
Gross Unrealized Loss   0
Gross Unrealized Gain   0
Fair Value   1,290,623
Freddie Mac | 30 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk   8.81%
Ginnie Mae
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 123,156 145,980
Gross Unrealized Loss (351) (64)
Gross Unrealized Gain 966 1,152
Fair Value 123,771 147,068
Ginnie Mae | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 0.73% 1.00%
Ginnie Mae | ARMs & Hybrids
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 122,746 145,558
Gross Unrealized Loss (351) (64)
Gross Unrealized Gain 939 1,129
Fair Value 123,334 146,623
Ginnie Mae | ARMs & Hybrids | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 0.73% 1.00%
Ginnie Mae | 15 Year Fixed
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 410 422
Gross Unrealized Loss 0 0
Gross Unrealized Gain 27 23
Fair Value $ 437 $ 445
Ginnie Mae | 15 Year Fixed | Portfolio Concentration Risk | Available-for-sale Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Percentage of concentration risk 0.00% 0.00%