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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, 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
Dec. 31, 2010
Basic earnings per common share computation                      
Net income per consolidated statements of income $ 3,890 $ 4,563 $ 4,336 $ 4,347 $ 3,869 $ 4,067 $ 3,891 $ 3,277 $ 17,136 $ 15,104 $ 11,316
Net earnings allocated to participating securities                 (62) (42) (33)
Net earnings allocated to common stock                 17,074 15,062 11,283
Net earnings allocated to common stock                 17,074 15,062 11,283
Weighted average common shares outstanding, including shares considered participating securities                 12,441 12,306 10,630
Less: Average participating securities                 (41) (33) (30)
Weighted average shares                 12,400 12,273 10,600
Basic earnings per common share $ 0.31 $ 0.37 $ 0.35 $ 0.35 $ 0.31 $ 0.33 $ 0.32 $ 0.27 $ 1.38 $ 1.23 $ 1.06
Diluted earnings per common share computation                      
Net earnings allocated to common stock                 17,074 15,062 11,283
Weighted average common shares outstanding for basic earnings per common share                 12,400 12,273 10,600
Add: Dilutive effects of assumed exercises of stock options                 3 6 9
Weighted average shares and dilutive potential common shares                 12,403 12,279 10,609
Diluted earnings per common share $ 0.31 $ 0.37 $ 0.35 $ 0.35 $ 0.31 $ 0.33 $ 0.32 $ 0.27 $ 1.38 $ 1.23 $ 1.06
Distributed earnings allocated to common stock [Member]
                      
Basic earnings per common share computation                      
Net earnings allocated to common stock                 8,182 8,101 6,914
Net earnings allocated to common stock                 8,182 8,101 6,914
Undistributed earnings allocated to common stock [Member]
                      
Basic earnings per common share computation                      
Net earnings allocated to common stock                 8,892 6,961 4,369
Net earnings allocated to common stock                 $ 8,892 $ 6,961 $ 4,369