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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) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount | $ 0 | $ 23,586 | $ 0 | $ 40,435
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount | 0 | 11,068 | 14,012 | 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 During Period, Amount | 0 | 13,940 | 0 | 30,789
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount | 0 | 0 | 14,012 | 11,156
Corporate securities | 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 During Period, Amount | 0 | 11,777 | 0 | 14,773
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount | 0 | 0 | 14,012 | 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 During Period, Amount |  |  | 0 | 0
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount |  |  | 0 | 11,152
State and political subdivisions | 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 During Period, Amount |  |  | 0 | 12,794
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount |  |  | 0 | 0
Other foreign government, supranational and foreign government-sponsored enterprises | 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 During Period, Amount | 0 | 2,163 | 0 | 3,222
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount | 0 | 0 | 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 During Period, Amount | 0 | 9,646 | 0 | 9,646
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount | $ 0 | $ 11,068 | $ 0 | $ 11,068

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- Definition Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount + References No definition available. + Details
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- Definition Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount + References No definition available. + Details
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