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Stock-Based Compensation Plans Stock Options (Details)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Number of Stock Options  
Outstanding on December 31, 2014 | shares 5,910
Granted | shares 40,000
Outstanding on December 31, 2015 | shares 45,910
Weighted Average Exercise Price  
Outstanding on December 31, 2014 | $ / shares $ 14.04
Granted | $ / shares 28.40
Outstanding on December 31, 2015 | $ / shares $ 26.55