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Earnings Per Share (Calculation of Basic and Diluted EPS) (Details) (USD $)
In Thousands, except 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
Earnings Per Share [Abstract]                      
Net income $ 4,199 $ 8,575 $ 9,344 $ 6,785 $ 8,050 $ 10,056 $ 8,914 $ 5,667 $ 28,903 $ 32,687 $ 21,117
Average Common Shares:                      
Basic (weighted-average outstanding shares)                 11,899,000 11,848,000 11,782,000
Dilutive potential common shares from stock options, shares                 159,000 118,000 111,000
Diluted (weighted-average outstanding shares) 12,090 12,056 12,058 12,027 11,973 11,947 11,966 11,980 12,058,000 11,966,000 11,893,000
Basic earnings per share (in dollars per share)                 $ 2.43 $ 2.76 $ 1.79
Diluted earnings per share (in dollars per share) $ 0.35 $ 0.71 $ 0.77 $ 0.56 $ 0.67 $ 0.84 $ 0.74 $ 0.47 $ 2.40 $ 2.73 $ 1.78
Stock options excluded from diluted earnings per share calculation (shares)                 38,954 78,337 133,700