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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) (Available-for-sale Securities [Member]) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Equity, Level 1 to Level 2 Transfers, Description | 0 | 0 | 0 | 0
Fair Value, Equity, Level 2 to Level 1 Transfers, Description | 5888 | 0 | 15946 | 14012
Corporate Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Equity, Level 1 to Level 2 Transfers, Description | 0 | 0 | 0 | 0
Fair Value, Equity, Level 2 to Level 1 Transfers, Description | 5888 | 0 | 15946 | 14012

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- Definition Description of the transfers of financial instruments classified in shareholders' equity measured on a recurring basis out of level 1 and into level 2 of the fair value hierarchy. + 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 (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Description of the transfers of financial instruments classified in shareholders' equity measured on a recurring basis out of level 2 and into level 1 of the fair value hierarchy. + 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 (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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