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Employee Benefit Plans (Executive Incentive Retirement Plan) (Details) - Executive Management - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Deferred compensation arrangement, option to elect to defer fees and bonuses, percentage 100.00%    
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Deferred compensation arrangement, option to elect to defer fees and bonuses, percentage 7.50%    
Deferred compensation, discretionary contribution percentage of base salary 7.50%    
Deferred compensation, maximum percentage per year 15.00%    
Other Postretirement Benefits Plan      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Accrued employee benefits $ 88 $ 90 $ 30