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Federal Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current:      
Federal $ 4,030 $ 3,058 $ 2,172
Deferred:      
Federal (126) (165) 210
Total $ 3,904 $ 2,893 $ 2,382