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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Schedule of provision for income taxes                    
Taxes currently payable                 $ 71 $ (179)
Deferred provision                 1,858 837
Income tax expense $ 667 $ 513 $ 391 $ 358 $ 157 $ 137 $ 237 $ 127 $ 1,929 $ 658