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Mortgage Backed Securities Mortgage backed securities (Tables) | 3 Months Ended
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Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities [Table Text Block] | The following table presents the components and weighted average coupon ("WAC") for the portion of the Company’s MBS designated as AFS as of March 31, 2014 and December 31, 2013:
| March 31, 2014
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | WAC
Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | $ | 2,438,133 |  |  | $ | 139,899 |  |  | $ | 2,578,032 |  |  | $ | 6,708 |  |  | $ | (45,438 | ) |  | $ | 2,539,302 |  |  | 3.20 | %
CMBS | 286,931 |  |  | 19,838 |  |  | 306,769 |  |  | 11,384 |  |  | (509 | ) |  | 317,644 |  |  | 5.23 | %
CMBS IO (1) | — |  |  | 461,523 |  |  | 461,523 |  |  | 11,581 |  |  | (1,859 | ) |  | 471,245 |  |  | 0.94 | %
Total Agency AFS: | 2,725,064 |  |  | 621,260 |  |  | 3,346,324 |  |  | 29,673 |  |  | (47,806 | ) |  | 3,328,191 |  |  |  |
Non-Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | 15,454 |  |  | (7 | ) |  | 15,447 |  |  | 209 |  |  | (86 | ) |  | 15,570 |  |  | 4.42 | %
CMBS | 375,209 |  |  | (17,819 | ) |  | 357,390 |  |  | 19,448 |  |  | (842 | ) |  | 375,996 |  |  | 5.05 | %
CMBS IO (1) | — |  |  | 209,301 |  |  | 209,301 |  |  | 3,374 |  |  | (1,148 | ) |  | 211,527 |  |  | 0.80 | %
Total non-Agency AFS: | 390,663 |  |  | 191,475 |  |  | 582,138 |  |  | 23,031 |  |  | (2,076 | ) |  | 603,093 |  |  |  |
Total AFS securities | $ | 3,115,727 |  |  | $ | 812,735 |  |  | $ | 3,928,462 |  |  | $ | 52,704 |  |  | $ | (49,882 | ) |  | $ | 3,931,284 |  |  |
(1) | The notional balance for Agency CMBS IO and non-Agency CMBS IO was $10,582,484 and $5,053,884, respectively, as of March 31, 2014.
| December 31, 2013
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | WAC
Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | $ | 2,591,568 |  |  | $ | 154,220 |  |  | $ | 2,745,788 |  |  | $ | 6,104 |  |  | $ | (59,742 | ) |  | $ | 2,692,150 |  |  | 3.22 | %
CMBS | 273,830 |  |  | 19,061 |  |  | 292,891 |  |  | 10,793 |  |  | (900 | ) |  | 302,784 |  |  | 5.07 | %
CMBS IO (1) | — |  |  | 453,766 |  |  | 453,766 |  |  | 9,895 |  |  | (3,334 | ) |  | 460,327 |  |  | 0.83 | %
Total Agency AFS: | 2,865,398 |  |  | 627,047 |  |  | 3,492,445 |  |  | 26,792 |  |  | (63,976 | ) |  | 3,455,261 |  |  |  |
Non-Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | 13,845 |  |  | (338 | ) |  | 13,507 |  |  | 338 |  |  | (80 | ) |  | 13,765 |  |  | 4.61 | %
CMBS | 375,703 |  |  | (18,277 | ) |  | 357,426 |  |  | 15,366 |  |  | (3,511 | ) |  | 369,281 |  |  | 5.10 | %
CMBS IO (1) | — |  |  | 150,518 |  |  | 150,518 |  |  | 2,618 |  |  | (1,999 | ) |  | 151,137 |  |  | 0.66 | %
Total non-Agency AFS: | 389,548 |  |  | 131,903 |  |  | 521,451 |  |  | 18,322 |  |  | (5,590 | ) |  | 534,183 |  |  |  |
Total AFS securities | $ | 3,254,946 |  |  | $ | 758,950 |  |  | $ | 4,013,896 |  |  | $ | 45,114 |  |  | $ | (69,566 | ) |  | $ | 3,989,444 |  |  |
(1) | The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $10,160,502 and $4,274,957, respectively, as of December 31, 2013.
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 March 31, 2014 and December 31, 2013:
| March 31, 2014 |  | December 31, 2013
| 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 | $ | 1,563,078 |  |  | $ | (29,207 | ) |  | 120 |  |  | $ | 1,912,937 |  |  | $ | (43,543 | ) |  | 150
Non-Agency MBS | 126,578 |  |  | (1,990 | ) |  | 23 |  |  | 162,558 |  |  | (5,435 | ) |  | 39
Continuous unrealized loss position for 12 months or longer: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 767,744 |  |  | $ | (18,600 | ) |  | 80 |  |  | $ | 670,402 |  |  | $ | (20,433 | ) |  | 67
Non-Agency MBS | 1,676 |  |  | (86 | ) |  | 5 |  |  | 6,310 |  |  | (155 | ) |  | 6

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