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Federal Income Taxes (Details 1) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of the differences between federal income tax expense (benefit) recorded and the amount computed by applying the federal statutory rate to income before income taxes      
Tax at statutory rate (35%) $ 6,360,000 $ 3,543,000 $ (4,677,000)
Increase (decrease) from      
Tax-exempt interest (486,000) (595,000) (706,000)
Bank owned life insurance (535,000) (622,000) (601,000)
Change in valuation allowance 0 (29,640,000) 5,896,000
Other 297,000 (47,000) 41,000
Tax expense (benefit) $ 5,636,000 $ (27,361,000) $ (47,000)