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Employee Benefit and Deferred Compensation Plans - Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Shares      
Outstanding at beginning of year (shares) 89,750 185,625 621,446
Granted (shares) 0 0 0
Exercised (shares) (41,000) (95,875) (435,177)
Forfeited (shares) (5,000) 0 (644)
Outstanding at end of year (shares) 43,750 89,750 185,625
Exercisable at end of year (shares) 43,750 89,750 185,625
Weighted Average Exercise Price      
Outstanding at beginning of year (usd per share) $ 15.67 $ 15.97 $ 17.88
Granted (usd per share) 0.00 0.00 0.00
Exercised (usd per share) 15.54 16.25 18.67
Forfeited (usd per share) 15.32 0.00 29.67
Outstanding at end of year (usd per share) 15.84 15.67 15.97
Exercisable at end of year (usd per share) $ 15.84 $ 15.67 $ 15.97
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) 2 years 7 months 17 days 3 years 1 month 21 days 3 years 10 months 28 days
Exercisable at end of year, Weighted Average Remaining Contractual Life (in years) 2 years 7 months 17 days 3 years 1 month 21 days 3 years 10 months 28 days
Aggregate Intrinsic Value, Outstanding $ 627 $ 2,263 $ 4,872
Aggregate Intrinsic Value, Exercisable $ 627 $ 2,263 $ 4,872