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Net Income Per Share - Reconciliation of the numerators and denominators of the basic and diluted net income per share computations (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Net income (numerator):                      
Net income (in dollars) $ 4,526 $ 4,541 $ 4,150 $ 4,755 $ 4,602 $ 4,577 $ 4,034 $ 3,952 $ 17,972 $ 17,165 $ 16,659
Shares (denominator)                      
Weighted average number of common shares outstanding used in basic computation                 19,901 19,926 20,613
Common shares issuable upon the vesting of restricted stock                 132 113 85
Common shares issuable upon conversion of preferred shares                 10 10 10
Shares used in diluted computation                 20,043 20,049 20,708
Net income per common share:                      
Basic (in dollars per share)                 $ 0.90 $ 0.86 $ 0.81
Diluted (in dollars per share) $ 0.23 $ 0.23 $ 0.21 $ 0.24 $ 0.23 $ 0.23 $ 0.20 $ 0.20 $ 0.90 $ 0.86 $ 0.80