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Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0 | $ 40,435
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 30,599 | 22,224
Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 30,789
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 30,599 | 11,156
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 14,773
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 30,599 | 4
US Treasury and Government [Member] | Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 11,152
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 12,794
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 0
Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 3,222
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 | 0
Nonredeemable Preferred Stock [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 | 9,646
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | $ 0 | $ 11,068

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + 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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + 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=25499696&loc=d3e19207-110258 + Details
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