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Employee Benefit and Deferred Compensation Plans - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Outstanding at beginning of year (shares) 29,250 43,750 89,750
Granted (shares) 0 0 0
Exercised (shares) (18,750) (14,500) (41,000)
Forfeited (shares) 0 0 (5,000)
Outstanding at end of year (shares) 10,500 29,250 43,750
Exercisable at end of year (shares) 10,500 29,250 43,750
Weighted Average Exercise Price      
Outstanding at beginning of year (usd per share) $ 15.86 $ 15.84 $ 15.67
Granted (usd per share) 0 0 0
Exercised (usd per share) 16.37 15.79 15.54
Forfeited (usd per share) 0 0 15.32
Outstanding at end of year (usd per share) 14.96 15.86 15.84
Exercisable at end of year (usd per share) $ 14.96 $ 15.86 $ 15.84
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 1 year 11 months 8 days 2 years 7 months 17 days
Exercisable at end of year, Weighted Average Remaining Contractual Life (in years) 1 year 1 year 11 months 8 days 2 years 7 months 17 days
Aggregate Intrinsic Value, Outstanding $ 191 $ 574 $ 627
Aggregate Intrinsic Value, Exercisable $ 191 $ 574 $ 627