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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