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Equity Compensation Plans - Restricted Stock Outstanding (Details) - Restricted Stock - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Shares      
Outstanding at beginning of period (in shares) 187,180 109,464 166,941
Granted (in shares) 144,056 141,069 2,574
Vested (in shares) (50,107) (42,675) (44,209)
Forfeited (in shares) (76,614) (20,678) (15,842)
Balance at End of Period (in shares) 204,515 187,180 109,464
Weighted Average Grant Date Fair Market Value      
Outstanding at beginning of period (in dollars per share) $ 18.22 $ 15.97 $ 15.01
Granted (in dollars per share) 11.89 19.03 19.42
Vested (in dollars per share) 17.28 14.87 13.44
Forfeited (in dollars per share) 18.01 18.74 13.45
Balance at End of Period (in dollars per share) $ 14.27 $ 18.22 $ 15.97