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Stock-Based Compensation - Restricted Stock Activity (Details) - $ / shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Restricted Stock Awards    
Shares    
Nonvested at beginning of period (in shares) 137,399 261,296
Vested (in shares) (67,602) (107,202)
Forfeited (in shares) (3,489) (10,418)
Nonvested at end of period (in shares) 66,308 143,676
Weighted-Average Grant Date Fair Value    
Nonvested at beginning of period (in usd per share) $ 17.00 $ 16.80
Vested (in usd per share) 16.70 16.49
Forfeited (in usd per share) 16.92 16.80
Nonvested at end of period (in usd per share) $ 17.31 $ 17.02
Restricted Stock Units    
Shares    
Nonvested at beginning of period (in shares) 90,544 0
Granted (in shares) 125,376 92,019
Vested (in shares) (32,375)  
Forfeited (in shares) (4,617) (1,812)
Nonvested at end of period (in shares) 178,928 90,207
Weighted-Average Grant Date Fair Value    
Nonvested at beginning of period (in usd per share) $ 25.31 $ 0.00
Granted (in usd per share) 30.62 25.29
Vested (in usd per share) 25.44  
Forfeited (in usd per share) 27.82 25.35
Nonvested at end of period (in usd per share) $ 28.94 $ 25.29