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Mortgage Backed Securities Mortgage backed securities (Tables) | 9 Months Ended
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Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities [Table Text Block] | The following table presents the components of the Company’s MBS designated as AFS as of September 30, 2013 and December 31, 2012:
| September 30, 2013
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Net Unrealized Gain (Loss) |  | Fair Value |  | Weighted average coupon
Agency: |  |  |  |  |  |  |  |  |  |  |
RMBS | $ | 2,723,084 |  |  | $ | 162,370 |  |  | $ | 2,885,454 |  |  | $ | (56,407 | ) |  | $ | 2,829,047 |  |  | 3.26 | %
CMBS | 261,440 |  |  | 19,844 |  |  | 281,284 |  |  | 11,941 |  |  | 293,225 |  |  | 4.82 | %
CMBS IO (1) | — |  |  | 466,494 |  |  | 466,494 |  |  | 9,114 |  |  | 475,608 |  |  | 0.89 | %
Total Agency AFS: | 2,984,524 |  |  | 648,708 |  |  | 3,633,232 |  |  | (35,352 | ) |  | 3,597,880 |  |  |
Non-Agency: |  |  |  |  |  |  |  |  |  |  |
RMBS | 14,972 |  |  | (351 | ) |  | 14,621 |  |  | (33 | ) |  | 14,588 |  |  | 4.58 | %
CMBS | 381,342 |  |  | (17,213 | ) |  | 364,129 |  |  | 10,620 |  |  | 374,749 |  |  | 5.52 | %
CMBS IO (1) | — |  |  | 123,172 |  |  | 123,172 |  |  | 2,377 |  |  | 125,549 |  |  | 0.87 | %
Total non-Agency AFS: | 396,314 |  |  | 105,608 |  |  | 501,922 |  |  | 12,964 |  |  | 514,886 |  |  |
Total AFS securities | $ | 3,380,838 |  |  | $ | 754,316 |  |  | $ | 4,135,154 |  |  | $ | (22,388 | ) |  | $ | 4,112,766 |  |  |
(1) | The notional balance for Agency CMBS IO and non-Agency CMBS IO is $9,682,065 and $2,857,343, respectively, as of September 30, 2013.
| December 31, 2012
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Net Unrealized Gain (Loss) |  | Fair Value |  | Weighted average coupon
Agency: |  |  |  |  |  |  |  |  |  |  |
RMBS | $ | 2,425,826 |  |  | $ | 137,168 |  |  | $ | 2,562,994 |  |  | $ | 8,343 |  |  | $ | 2,571,337 |  |  | 3.67 | %
CMBS | 280,602 |  |  | 21,907 |  |  | 302,509 |  |  | 21,564 |  |  | 324,073 |  |  | 5.19 | %
CMBS IO (1) | — |  |  | 550,171 |  |  | 550,171 |  |  | 17,009 |  |  | 567,180 |  |  | 0.95 | %
Total Agency AFS: | 2,706,428 |  |  | 709,246 |  |  | 3,415,674 |  |  | 46,916 |  |  | 3,462,590 |  |  |
Non-Agency: |  |  |  |  |  |  |  |  |  |  |
RMBS | 11,411 |  |  | (781 | ) |  | 10,630 |  |  | 408 |  |  | 11,038 |  |  | 4.28 | %
CMBS | 463,747 |  |  | (17,313 | ) |  | 446,434 |  |  | 39,908 |  |  | 486,342 |  |  | 5.31 | %
CMBS IO (1) | — |  |  | 108,928 |  |  | 108,928 |  |  | 5,014 |  |  | 113,942 |  |  | 0.86 | %
Total non-Agency AFS: | 475,158 |  |  | 90,834 |  |  | 565,992 |  |  | 45,330 |  |  | 611,322 |  |  |
Total AFS securities | $ | 3,181,586 |  |  | $ | 800,080 |  |  | $ | 3,981,666 |  |  | $ | 92,246 |  |  | $ | 4,073,912 |  |  |
(1) | The notional balance for the Agency CMBS IO and non-Agency CMBS IO is $10,059,495 and $2,393,614, respectively, as of December 31, 2012.
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] | The following table presents certain information for those Agency MBS in an unrealized loss position as of September 30, 2013 and December 31, 2012:
| September 30, 2013 |  | December 31, 2012
| Fair Value |  | Gross Unrealized Losses |  | # of Securities |  | Fair Value |  | Gross Unrealized Losses |  | # of Securities
Continuous unrealized loss position for less than 12 months: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 2,129,694 |  |  | $ | (48,337 | ) |  | 164 |  | $ | 1,026,277 |  |  | $ | (6,552 | ) |  | 83
Non-Agency MBS | 126,846 |  |  | (5,902 | ) |  | 23 |  | 13,877 |  |  | (76 | ) |  | 3
Continuous unrealized loss position for 12 months or longer: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 558,070 |  |  | $ | (17,718 | ) |  | 67 |  | $ | 271,719 |  |  | $ | (5,797 | ) |  | 34
Non-Agency MBS | 1,820 |  |  | (100 | ) |  | 6 |  | 2,701 |  |  | (198 | ) |  | 8

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