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Employee Benefit Plans Employee Benefit Plans 13 (Details) - SERP - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in Benefit Obligation:      
Projected benefit obligation at beginning of year $ 20,783 $ 16,317  
Service cost 930 799 $ 814
Interest cost 893 743 653
Actuarial (gain) loss 1,872 3,341  
Benefits/expenses paid (416) (417)  
Projected benefit obligation at end of year 24,062 20,783 $ 16,317
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 0    
Fair value of plan assets at end of year 0 0  
Funded Status:      
Net amount recognized as accrued pension cost $ (24,062) $ (20,783)