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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Investments, Owned, Federal Income Tax Note [Line Items]          
Deferred tax assets $ 3,198,000   $ 3,198,000   $ 3,164,000
Income tax expense (benefit) $ 862,000 $ 1,082,000 $ 1,709,000 $ 2,356,000  
Effective income tax rate     34.00% 32.00%