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Valuation Schedule of Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value | $ 0 | $ 23,181 | [1]
Financial derivatives-liabilities at fair value | 0 | 7,067 | [1]
Fair Value Level 1 To Level 2 To Level 3 Transfers Amount | 0 | 0 |
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value |  | 0 |
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value |  | 1,448,783 |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value |  | 47,189 |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value |  | 1,495,972 |
Non-Agency RMBS [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value | 0 | 0 |
Non-Agency RMBS [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value | 0 | 0 |
Non-Agency RMBS [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value | 13,596 | 34,467 |
Non-Agency RMBS [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value | 13,596 | 34,467 |
Residential Mortgage Backed Securities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value | 0 | 0 |
Residential Mortgage Backed Securities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value | 0 | 1,425,602 |
Residential Mortgage Backed Securities [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value | 13,596 | 47,189 |
Residential Mortgage Backed Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value | 13,596 | 1,472,791 |
15-year fixed rate mortgages [Member] | Agency RMBS [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 0 |
15-year fixed rate mortgages [Member] | Agency RMBS [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 199,450 |
15-year fixed rate mortgages [Member] | Agency RMBS [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 0 |
15-year fixed rate mortgages [Member] | Agency RMBS [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 199,450 |
30-year fixed rate mortgages [Member] | Agency RMBS [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 0 |
30-year fixed rate mortgages [Member] | Agency RMBS [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 1,194,445 |
30-year fixed rate mortgages [Member] | Agency RMBS [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 0 |
30-year fixed rate mortgages [Member] | Agency RMBS [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 1,194,445 |
Adjustable Rate Residential Mortgage [Member] | Agency RMBS [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 0 |
Adjustable Rate Residential Mortgage [Member] | Agency RMBS [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 31,707 |
Adjustable Rate Residential Mortgage [Member] | Agency RMBS [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 0 |
Adjustable Rate Residential Mortgage [Member] | Agency RMBS [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 31,707 |
Interest-Only [Member] | Agency RMBS [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 0 |
Interest-Only [Member] | Agency RMBS [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 0 |
Interest-Only [Member] | Agency RMBS [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 12,722 |
Interest-Only [Member] | Agency RMBS [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Real estate securities, fair value |  | 12,722 |
Derivative Financial Instruments, Assets [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 0 |
Derivative Financial Instruments, Assets [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 23,181 |
Derivative Financial Instruments, Assets [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 0 |
Derivative Financial Instruments, Assets [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 23,181 |
Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 0 |
Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | (7,067) |
Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 0 |
Derivative Financial Instruments, Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | (7,067) |
Interest Rate Swap [Member] | Derivative Financial Instruments, Assets [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 23,077 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Assets [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 0 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Assets [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 23,077 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Assets [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 0 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Assets [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 23,077 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 1,409 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 0 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | (1,409) |
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 0 |
Interest Rate Swap [Member] | Derivative Financial Instruments, Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | (1,409) |
Interest Rate Swaption [Member] | Derivative Financial Instruments, Liabilities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 86 |
Interest Rate Swaption [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 0 |
Interest Rate Swaption [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | (86) |
Interest Rate Swaption [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 0 |
Interest Rate Swaption [Member] | Derivative Financial Instruments, Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | (86) |
TBA securities [Member] | Derivative Financial Instruments, Assets [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 0 |
TBA securities [Member] | Derivative Financial Instruments, Assets [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 104 |
TBA securities [Member] | Derivative Financial Instruments, Assets [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 0 |
TBA securities [Member] | Derivative Financial Instruments, Assets [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-assets at fair value |  | 104 |
TBA securities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 0 |
TBA securities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | (5,572) |
TBA securities [Member] | Derivative Financial Instruments, Liabilities [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | 0 |
TBA securities [Member] | Derivative Financial Instruments, Liabilities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial derivatives-liabilities at fair value |  | $ (5,572) |
[1] | On the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.

X
- Definition The amount of the transfers of assets or liabilities measured on a recurring basis between Level 1, Level 2 or Level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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 (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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