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Employee Benefit and Deferred Compensation Plans - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Outstanding at beginning of year (shares) 43,750 89,750 185,625
Granted (shares) 0 0 0
Exercised (shares) (14,500) (41,000) (95,875)
Forfeited (shares) 0 (5,000) 0
Outstanding at end of year (shares) 29,250 43,750 89,750
Exercisable at end of year (shares) 29,250 43,750 89,750
Weighted Average Exercise Price      
Outstanding at beginning of year (usd per share) $ 15.84 $ 15.67 $ 15.97
Granted (usd per share) 0 0 0
Exercised (usd per share) 15.79 15.54 16.25
Forfeited (usd per share) 0 15.32 0
Outstanding at end of year (usd per share) 15.86 15.84 15.67
Exercisable at end of year (usd per share) $ 15.86 $ 15.84 $ 15.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Outstanding at end of year, Weighted Average Remaining Contractual Life (in years) 1 year 11 months 8 days 2 years 7 months 17 days 3 years 1 month 20 days
Exercisable at end of year, Weighted Average Remaining Contractual Life (in years) 1 year 11 months 8 days 2 years 7 months 17 days 3 years 1 month 20 days
Aggregate Intrinsic Value, Outstanding $ 574 $ 627 $ 2,263
Aggregate Intrinsic Value, Exercisable $ 574 $ 627 $ 2,263