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Employee Benefit and Deferred Compensation Plans (Details 7) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares      
Outstanding at beginning of year (shares) 185,625 621,446 830,950
Granted (shares) 0 0 0
Exercised (shares) (95,875) (435,177) (201,371)
Forfeited (shares) 0 (644) (8,133)
Outstanding at end of year (shares) 89,750 185,625 621,446
Exercisable at end of year (shares) 89,750 185,625 606,027
Weighted Average Exercise Price      
Outstanding at beginning of year (usd per share) $ 15.97 $ 17.88 $ 18.70
Granted (usd per share) 0.00 0.00 0.00
Exercised (usd per share) 16.25 18.67 20.82
Forfeited (usd per share) 0.00 29.67 29.45
Outstanding at end of year (usd per share) 15.67 15.97 17.88
Exercisable at end of year (usd per share) $ 15.67 $ 15.97 $ 17.85
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) 3 years 1 month 20 days 3 years 10 months 28 days 3 years 10 months 28 days
Exercisable at end of year, Weighted Average Remaining Contractual Life (in years) 3 years 1 month 20 days 3 years 10 months 28 days 3 years 9 months 29 days
Aggregate Intrinsic Value, Outstanding $ 2,263 $ 4,872 $ 10,274
Aggregate Intrinsic Value, Exercisable $ 2,263 $ 4,872 $ 10,038