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Net Income Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
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, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Net Income Per Share                              
Net income available for stockholders $ 2,559 $ 1,543 $ 2,248 $ 2,100 $ 2,199 $ 1,987 $ 2,054 $ 1,679 $ 2,176 $ 1,258 $ 1,429 $ 1,320 $ 8,450 $ 7,919 $ 6,183
Weighted avg. outstanding shares of common stock                         3,357 3,285 3,231
Dilutive effect of stock options (in shares)                         236 177 99
Common stock and equivalents (in shares)                         3,593 3,462 3,330
Net Income per share:                              
Basic (in dollars per share) $ 0.76 $ 0.46 $ 0.67 $ 0.63 $ 0.67 $ 0.60 $ 0.63 $ 0.51 $ 0.67 $ 0.39 $ 0.44 $ 0.41 $ 2.52 $ 2.41 $ 1.91
Diluted (in dollars per share) $ 0.71 $ 0.44 $ 0.64 $ 0.59 $ 0.64 $ 0.57 $ 0.59 $ 0.49 $ 0.64 $ 0.37 $ 0.43 $ 0.40 $ 2.35 $ 2.29 $ 1.86
Anti-dilutive stock options excluded from the calculation of diluted earnings per share (in shares)                         0 0 0