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Stock-Based Compensation Plans (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total intrinsic value of stock options exercised $ 146 $ 151 $ 242 $ 1,317
Cash received from stock option exercises 618 730 1,226 3,558
Income tax benefit from the exercise of stock options $ 48 $ 59 $ 85 $ 514