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Income Taxes (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current Income Tax Expense (Benefit) $ 2,612 $ 2,683 $ 2,867
Deferred Tax Assets, Operating Loss Carryforwards   263  
Tax Credit Carryforward, Expiration Date Dec. 31, 2030    
Realized Gain (Loss) on Sale of Investments [Member]
      
Current Income Tax Expense (Benefit)   $ 331 $ 152