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Stock-Based Compensation - Information Related to Options (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options outstanding options outstanding (in shares) | shares 50,601
Range $15.48 to $15.75  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, minimum (in dollars per share) $ 15.48
Range of Exercise Prices, maximum (in dollars per share) $ 15.75
Options outstanding options outstanding (in shares) | shares 225
Options outstanding remaining contractual life (Year) 32 days
Options exercisable weighted average exercise price (in dollars per share) $ 15.48
Range $15.76 to $17.15  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, minimum (in dollars per share) 15.76
Range of Exercise Prices, maximum (in dollars per share) $ 17.15
Options outstanding options outstanding (in shares) | shares 338
Options outstanding remaining contractual life (Year) 1 year 26 days
Options exercisable weighted average exercise price (in dollars per share) $ 16.02
Range $17.16 to $18.30  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, minimum (in dollars per share) 17.16
Range of Exercise Prices, maximum (in dollars per share) $ 18.3
Options outstanding options outstanding (in shares) | shares 49,475
Options outstanding remaining contractual life (Year) 234 days
Options exercisable weighted average exercise price (in dollars per share) $ 18.27
Range $18.31 to $18.33  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Range of Exercise Prices, minimum (in dollars per share) 18.31
Range of Exercise Prices, maximum (in dollars per share) $ 18.33
Options outstanding options outstanding (in shares) | shares 563
Options outstanding remaining contractual life (Year) 5 years 18 days
Options exercisable weighted average exercise price (in dollars per share) $ 18.33