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Fair Value Measurements (Narrative) (Details) | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value Inputs, Prepayment Rate | 1.00% |
Annual prepayments maturity | 100.00% |
Additional basis points | 1.50% |
Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Collateral discount | 30.00% | 30.00%
Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Collateral discount | 20.00% | 20.00%

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- Definition Additional basis points, annual defaults from banks. + References No definition available. + Details
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- Definition Annual prepayments maturity, percentage. + References No definition available. + Details
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- Definition Unobservable Inputs Fair Value Measurement Collateral Discount Percent + References No definition available. + Details
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- Details
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- Definition Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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