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Stock-Based Compensation - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Option Shares      
Outstanding at beginning of period (in shares) 67,871    
Replacement stock options (in shares) 0    
Granted (in shares) 0 0 0
Exercised (in shares) 5,784 42,680 26,000
Forfeited (in shares) 0    
Expired (in shares) 3,676    
Outstanding at end of period (in shares) 58,411 67,871  
Exercisable at end of period (shares) 58,411    
Weighted Average Exercise Price      
Outstanding at beginning of period (in dollars per share) $ 24.47    
Replacement stock options (in dollars per share) 0.00    
Granted (in dollars per share) 0.00    
Exercised (in dollars per share) 24.46    
Forfeited (in dollars per share) 0.00    
Expired (in dollars per share) 26.05    
Outstanding at end of period (in dollars per share) 24.37 $ 24.47  
Exercisable at end of period (in dollars per share) $ 24.37    
Weighted Average Remaining Contractual Term      
Outstanding at end of period 1 year 9 months    
Exercisable at end of period 1 year 9 months    
Aggregate Intrinsic Value      
Outstanding at end of period $ 618    
Exercisable at end of period $ 618