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Employee Benefit Plans (SERP Narrative) (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
USD ($)
payment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Benefit obligation   $ 2,747 $ 1,187 $ 1,023 $ 923
President and CEO | SERP          
Defined Benefit Plan Disclosure [Line Items]          
Percent of average executive base salary   60.00%      
Payment term after separation   36 months      
Percent of average executive base salary, adjustment thereafter   2.00%      
Number of annual payments after separation | payment   15      
Benefit obligation   $ 5,500      
Assumptions used calculating benefit obligation, discount rate   4.00%      
Annual vesting percentage 3.00%        
Award vesting rights, percentage 100.00%