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Valuation Unobservable Input Reconciliation (Details) (Level 3 [Member], USD $) In Thousands, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2013
Agency RMBS [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Beginning balance |  |  | $ 9,905 |  | $ 0 |
Transfers |  |  |  |  |  |
Transfers into level 3 |  |  | 0 | [1] | 0 | [1]
Transfers out of level 3 |  |  | 0 | [1] | 0 | [1]
Purchases |  |  | 3,094 |  | 12,116 |
Proceeds from sales |  |  | 0 |  | 0 |
Principal repayments |  |  | 0 |  | 0 |
(Amortization)/accretion, net |  |  | (626) |  | (761) |
Net realized gains |  |  | 0 |  | 0 |
Change in net unrealized gains (losses) |  |  | 349 |  | 1,367 |
Ending balance |  |  | 12,722 |  | 12,722 |
Change in net unrealized gains (losses) for level 3 assets still held as of September 30, 2013 |  |  | 349 |  | 1,367 |
Non-Agency RMBS [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Beginning balance | 0 |  | 38,810 |  | 13,596 |
Transfers |  |  |  |  |  |
Transfers into level 3 | 0 | [1] | 0 | [1] | 0 | [1]
Transfers out of level 3 | 0 | [1] | 0 | [1] | 0 | [1]
Purchases | 5,134 |  | 6,402 |  | 37,180 |
Proceeds from sales | 0 |  | (9,247) |  | (14,556) |
Principal repayments | 0 |  | (2,927) |  | (4,390) |
(Amortization)/accretion, net | 0 |  | 307 |  | 631 |
Net realized gains | 0 |  | 581 |  | 1,469 |
Change in net unrealized gains (losses) | 0 |  | 541 |  | 537 |
Ending balance | 5,134 |  | 34,467 |  | 34,467 |
Change in net unrealized gains (losses) for level 3 assets still held as of September 30, 2013 | $ 0 |  | $ 718 |  | $ 630 |
[1] | Transfers are assumed to occur at the beginning of the period.

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- Definition Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortized Premiums/Accreted Discounts, Net + References No definition available. + Details
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- Definition Fair Value, Measurements with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Principal Repayments + References No definition available. + Details
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- Definition This item represents the amount of the total change in unrealized (holding) gains or losses for the period which are included in the statement of income (or changes in net assets) in investment income. Such unrealized (holding) gains or losses relate to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of gain (loss) recognized in earnings, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from assets measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Purchases that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Sales that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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