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Equity - Options (Details) - Stock options - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nonqualified stock option activity      
Outstanding, beginning of period 15,000 20,000 25,000
Granted (in shares)     0
Exercised (in shares)   (5,000) (5,000)
Outstanding, end of period 15,000 15,000 20,000
Options exercisable (in shares) 15,000 15,000 2,000
Weighted Average Price      
Outstanding at the beginning of the year (in dollars per share) $ 38.43 $ 34.99 $ 32.92
Exercised (in dollars per share)   24.65 24.65
Outstanding at the end of the year (in dollars per share) 38.43 38.43 34.99
Exercisable at the end of the period (in dollars per share) $ 38.43 $ 38.43 $ 34.99
Other information      
Aggregate intrinsic value of exercisable options at the end of the year $ 7,200,000    
Weighted average remaining contractual life of options exercisable 2 years 2 months 12 days 3 years 2 months 12 days 3 years 3 months 18 days
Options Value   $ 123,000 $ 123,000
Market Value   $ 233,000 $ 205,000
Compensation expense related to share-based award $ 0