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Retirement and Share-based Compensation Plans (Share-based Compensation Expense By Plan) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
ESOP, compensation expense $ 2,194 $ 1,474 $ 2,522
Compensation expense 8,594 4,441 4,414
Employee Incentive Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense 5,434 2,155 1,207
Director Equity Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation expense $ 966 $ 812 $ 685