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Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net income per consolidated statements of income $ 4,563 $ 4,067 $ 13,246 $ 11,235
Net earnings allocated to participating securities (17) (12) (50) (34)
Net earnings allocated to common stock 4,546 4,055 13,196 11,201
Basic earnings per common share computation:        
Net earnings allocated to common stock 4,546 4,055 13,196 11,201
Weighted average common shares outstanding, including shares considered participating securities 12,448 12,315 12,430 12,290
Less: Average participating securities (41) (31) (42) (35)
Weighted average shares 12,407 12,284 12,388 12,255
Basic earnings per common share $ 0.37 $ 0.33 $ 1.07 $ 0.91
Diluted earnings per common share computation:        
Net earnings allocated to common stock 4,546 4,055 13,196 11,201
Weighted average common shares outstanding for basic earnings per common share 12,407 12,284 12,388 12,255
Add: Dilutive effects of assumed exercises of stock options 4 6 4 7
Weighted average shares and dilutive potential common shares 12,411 12,290 12,392 12,262
Diluted earnings per common share $ 0.37 $ 0.33 $ 1.06 $ 0.91
Distributed earnings allocated to common stock [Member]
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net earnings allocated to common stock 2,045 2,025 6,130 6,064
Basic earnings per common share computation:        
Net earnings allocated to common stock 2,045 2,025 6,130 6,064
Undistributed earnings allocated to common stock [Member]
        
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]        
Net earnings allocated to common stock 2,501 2,030 7,066 5,137
Basic earnings per common share computation:        
Net earnings allocated to common stock $ 2,501 $ 2,030 $ 7,066 $ 5,137