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Fair Value Disclosures (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Level 1 to level 2 Transfers, Amount | $ 16,849 | $ 25,726 | $ 16,849 | $ 25,726
Fair Value, Level 2 to level 1 Transfers, Amount | 11,152 | 0 | 11,156 | 0
Availableforsale Securities Member |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 16,849 | 23,436 | 16,849 | 23,436
Fair Value, Level 2 to level 1 Transfers, Amount | 11,152 | 0 | 11,156 | 0
Corporate Debt Securities Member | Availableforsale Securities Member |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 2,996 | 0 | 2,996 | 0
Fair Value, Level 2 to level 1 Transfers, Amount | 0 | 0 | 4 | 0
US Treasury And Government Member | Availableforsale Securities Member |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 0 | 23,065 | 0 | 23,065
Fair Value, Level 2 to level 1 Transfers, Amount | 11,152 | 0 | 11,152 | 0
US States And Political Subdivisions Member | Availableforsale Securities Member |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 12,794 | 0 | 12,794 | 0
Fair Value, Level 2 to level 1 Transfers, Amount | 0 | 0 | 0 | 0
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises | Availableforsale Securities Member |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 1,059 | 371 | 1,059 | 371
Fair Value, Level 2 to level 1 Transfers, Amount | 0 | 0 | 0 | 0
Equity Securities Other Member |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Level 1 to level 2 Transfers, Amount | 0 | 2,290 | 0 | 2,290
Fair Value, Level 2 to level 1 Transfers, Amount | $ 0 | $ 0 | $ 0 | $ 0

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- Definition The amount of the transfers of assets or liabilities 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=6925170&loc=d3e19207-110258 + Details
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- Definition The amount of the transfers of assets or liabilities 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=6925170&loc=d3e19207-110258 + Details
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