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Employee Benefit Plans (Change in Plan Assets and Funded Status) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Benefit Obligation, Beginning Balance $ 48,590 $ 54,319
Interest cost 1,863 1,712
Actuarial loss (gain) 6,157 (4,037)
Benefits paid (3,316) (3,404)
Defined Benefit Plan, Benefit Obligation, Ending Balance 53,294 48,590
Plan assets - Beginning of year 42,749 48,556
Return on plan assets 7,351 (2,403)
Benefits paid (3,316) (3,404)
Plan assets at fair value - End of year 46,784 42,749
Funded status of plans - End of year (6,510) (5,841)
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Benefit Obligation, Beginning Balance 5,370 5,956
Service cost 18 33
Interest cost 183 186
Actuarial loss (gain)   (237)
Benefits paid (601) (568)
Liability gain due to termination (4,369)  
Defined Benefit Plan, Benefit Obligation, Ending Balance 601 5,370
Employer contributions 601 568
Benefits paid (601) (568)
Funded status of plans - End of year $ (601) $ (5,370)