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Repurchase Agreements Schedule of Repurchase Agreements by Maturity (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements | $ 1,292,946 | [1] | $ 0
Debt, Weighted Average Interest Rate | 0.38% |  |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 52 days |  |
Maturity up to 30 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements | 513,660 |  |
Debt, Weighted Average Interest Rate | 0.36% |  |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 11 days |  |
Maturity 31 to 60 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements | 412,485 |  |
Debt, Weighted Average Interest Rate | 0.38% |  |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 45 days |  |
Maturity 61 to 90 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements | 143,530 |  |
Debt, Weighted Average Interest Rate | 0.38% |  |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 74 days |  |
Maturity 91 to 120 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements | 28,897 |  |
Debt, Weighted Average Interest Rate | 0.39% |  |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 105 days |  |
Maturity 121 to 150 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements | 99,464 |  |
Debt, Weighted Average Interest Rate | 0.42% |  |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 136 days |  |
Maturity 151 to 180 days [Member] |  |  |
Repurchase Agreements [Line Items] |  |  |
Repurchase agreements | $ 94,910 |  |
Debt, Weighted Average Interest Rate | 0.41% |  |
Repurchase Agreement Counterparty, Weighted Average Maturity of Agreements | 164 days |  |
[1] | On the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.

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- Definition Weighted average maturity (weighted by amount of the agreement) of repurchase agreements with the counterparty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph m -Subparagraph 1 -Article 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(B)(iii)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 + Details
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- Definition The carrying value as of the balance sheet date of securities that an institution sells and agrees to repurchase (the identical or substantially the same securities) as a seller-borrower at a specified date for a specified price, also known as a repurchase agreement, or repo. Most repos involve obligations of the federal government or its agencies, but other financial instruments, such as commercial paper, banker's acceptances, and negotiable certificates of deposit, are sometimes used in repos. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7472769&loc=d3e9760-107771 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 100 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 36 -IssueDate 2006-05-01 -Chapter 4 -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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