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Income Taxes (Details)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Income Taxes [Abstract]    
Statutory tax rate (in hundredths) 34.00% 34.00%
Increase (decrease) resulting from [Abstract]    
Tax exempt interest (in hundredths) (9.10%) (6.40%)
Tax exempt income on bank owned life insurance (in hundredths) (2.60%) (1.60%)
Other, net (in hundredths) 0.70% 0.10%
Effective tax rate (in hundredths) 23.00% 26.10%