Employee Benefits (Estimated Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Qualified Pension Plan [Member]
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Expected Future Payments, Next Twelve Months	$ 4,034
Expected Future Payments, Year Two	3,817
Expected Future Payments, Year Three	3,823
Expected Future Payments, Year Four	4,088
Expected Future Payments, Year Five	4,091
Expected Future Payments, Thereafter	28,295
Non-Qualified Retirement Plans [Member]
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Expected Future Payments, Next Twelve Months	907
Expected Future Payments, Year Two	898
Expected Future Payments, Year Three	886
Expected Future Payments, Year Four	878
Expected Future Payments, Year Five	878
Expected Future Payments, Thereafter	$ 4,355