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Repurchase Agreements Repurchase Agreements By Maturity Period (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | $ 3,674,850 | $ 3,564,128
Deferred Costs | (347) | (659)
Maturity up to 30 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 486,150 | 622,957
Maturity 31 to 60 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 677,725 | 1,263,105
Matuity 61 to 90 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 333,007 | 298,660
Maturity 91 to 120 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 1,021,594 |
Maturity over 90 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance |  | 1,092,681
Maturity 121 to 150 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 583,888 | 0
Maturity greater than 150 days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | 572,833 | 287,384
Repurchase Agreements [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Repurchase agreement, balance | $ 3,675,197 | $ 3,564,787

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- Definition The carrying amount of deferred costs. + References No definition available. + Details
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- Definition Carrying amount of liabilities associated with financial assets accounted for as secured borrowings recognized in the transferor's statement of financial position at the end of each period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=7523297&loc=SL6224234-111729 + Details
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