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Mortgage Backed Securities Mortgage backed securities (Tables) | 9 Months Ended
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Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] | The following tables present the components and weighted average coupon ("WAC") for the portion of the Company’s MBS designated as AFS as of September 30, 2014 and December 31, 2013:
| September 30, 2014
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | WAC
Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | $ | 2,200,149 |  |  | $ | 120,667 |  |  | $ | 2,320,816 |  |  | $ | 7,593 |  |  | $ | (31,105 | ) |  | $ | 2,297,304 |  |  | 3.14 | %
CMBS | 305,566 |  |  | 19,186 |  |  | $ | 324,752 |  |  | 13,803 |  |  | (224 | ) |  | 338,331 |  |  | 5.22 | %
CMBS IO (1) | — |  |  | 400,886 |  |  | $ | 400,886 |  |  | 10,944 |  |  | (113 | ) |  | 411,717 |  |  | 0.83 | %
Total Agency AFS: | $ | 2,505,715 |  |  | $ | 540,739 |  |  | $ | 3,046,454 |  |  | $ | 32,340 |  |  | $ | (31,442 | ) |  | $ | 3,047,352 |  |  |  |
Non-Agency: |  |  |  |  |  |  |  |  |  |  |  |  |
RMBS | $ | 9,522 |  |  | $ | (4 | ) |  | $ | 9,518 |  |  | $ | 118 |  |  | $ | (81 | ) |  | $ | 9,555 |  |  | 4.20 | %
CMBS | 266,596 |  |  | (12,374 | ) |  | 254,222 |  |  | 16,397 |  |  | (346 | ) |  | 270,273 |  |  | 4.89 | %
CMBS IO (1) | — |  |  | 282,890 |  |  | 282,890 |  |  | 5,636 |  |  | (313 | ) |  | 288,213 |  |  | 0.69 | %
Total non-Agency AFS: | $ | 276,118 |  |  | $ | 270,512 |  |  | $ | 546,630 |  |  | $ | 22,151 |  |  | $ | (740 | ) |  | $ | 568,041 |  |  |  |
Total AFS securities | $ | 2,781,833 |  |  | $ | 811,251 |  |  | $ | 3,593,084 |  |  | $ | 54,491 |  |  | $ | (32,182 | ) |  | $ | 3,615,393 |  |  |
(1) | The notional balance for Agency CMBS IO and non-Agency CMBS IO was $9,461,823 and $7,246,832, respectively, as of September 30, 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 (1) | 273,830 |  |  | 19,061 |  |  | 292,891 |  |  | 10,793 |  |  | (900 | ) |  | 302,784 |  |  | 5.07 | %
CMBS IO (2) | — |  |  | 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 (2) | — |  |  | 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) | As of December 31, 2013, the Company had Agency CMBS with an amortized cost of $26,920 and fair value of $28,717 which were designated as trading securities and are not included in this table. The Company changed the designation of these Agency CMBS to AFS during the three months ended June 30, 2014. Changes in the fair value of these MBS while they were designated as trading were recognized in net income within "fair value adjustments, net". Changes in the fair value of these MBS, which are now designated as AFS, are recognized in "other comprehensive income". As of September 30, 2014, the Company does not have any MBS designated as trading.
(2) | 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 September 30, 2014 and December 31, 2013:
| September 30, 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 | $ | 155,501 |  |  | $ | (1,142 | ) |  | 25 |  | $ | 1,912,937 |  |  | $ | (43,543 | ) |  | 150
Non-Agency MBS | 74,239 |  |  | (427 | ) |  | 17 |  | 162,558 |  |  | (5,435 | ) |  | 39
Continuous unrealized loss position for 12 months or longer: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 1,701,638 |  |  | $ | (30,299 | ) |  | 129 |  | $ | 670,402 |  |  | $ | (20,433 | ) |  | 67
Non-Agency MBS | 31,348 |  |  | (313 | ) |  | 8 |  | 6,310 |  |  | (155 | ) |  | 6

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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