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Fair Value Disclosures (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair Value, Level 1 to level 2 Transfers, Amount $ 23,586,000 $ 1,474,000 $ 40,435,000 $ 27,200,000
Fair Value, Level 2 to level 1 Transfers, Amount 11,068,000 5,485,000 22,224,000 5,485,000
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 13,940,000 1,474,000 30,789,000 24,910,000
Fair Value, Level 2 to level 1 Transfers, Amount 0 5,485,000 11,156,000 5,485,000
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 11,777,000 0 14,773,000 0
Fair Value, Level 2 to level 1 Transfers, Amount 0 0 4,000 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 0 0 23,065,000
Fair Value, Level 2 to level 1 Transfers, Amount 0 0 11,152,000 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 0 0 12,794,000 0
Fair Value, Level 2 to level 1 Transfers, Amount 0 5,485,000 0 5,485,000
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 2,163,000 1,474,000 3,222,000 1,845,000
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 0 0 2,290,000
Fair Value, Level 2 to level 1 Transfers, Amount $ 0 $ 0 $ 0 $ 0