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Offsetting Assets and Liabilities Offsetting Assets (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Offsetting Assets [Line Items] |  |
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value | $ 12,908 |
Derivative Asset, Fair Value, Gross Asset |  | 0
Derivative Asset, Fair Value, Gross Liability | 0 | 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 12,908 | 0
Derivative, Collateral, Obligation to Return Securities | (1,689) | 0
Derivative, Collateral, Obligation to Return Cash | (11,219) | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral | $ 0 | $ 0

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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