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Equity - Options (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Weighted Average Price      
Outstanding at the beginning of the year (in dollars per share) $ 30.76 $ 29.60  
Outstanding at the end of the year (in dollars per share) $ 32.92 $ 30.76 $ 29.60
Other information      
Weighted average remaining contractual life (in years) 3 years 6 months 2 years 10 months 24 days 2 years 7 months 6 days
Stock options      
Nonqualified stock option activity      
Outstanding, beginning of period 33,334 40,001 43,334
Granted (in shares)     0
Exercised (in shares) (8,334) (6,667) (3,333)
Outstanding, end of period 25,000 33,334 40,001
Options exercisable at end of the period (in shares) 25,000 28,334 30,001
Weighted Average Price      
Outstanding at the beginning of the year (in dollars per share) $ 30.76 $ 29.60 $ 29.16
Exercised (in dollars per share) 24.31 23.79 23.79
Outstanding at the end of the year (in dollars per share) 32.92 30.76 29.60
Exercisable at the end of the period (in dollars per share) $ 32.92 $ 45.45 $ 31.99
Other information      
Aggregate intrinsic value of exercisable options at the end of the year $ 266,000    
Weighted average remaining contractual life of options exercisable 3 years 6 months    
Value of options exercised $ 202,000 $ 159,000 $ 79,000
Market value of options on the date of exercise 410,797 311,000 140,000
Compensation expense related to share-based award $ 2,000 $ 15,000 $ 14,000