Retirement Plans SERP (Details) - Supplemental Employee Retirement Plans, Defined Benefit - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual Benefit Amount	$ 50,000
Year of Benefit	20 years
Defined Benefit Plan, Other Information-Number of Employees Covered	2
Defined Benefit Plan, Other Cost (Credit)	$ 36,000	$ 40,000	$ 43,000
Liability, Defined Benefit Plan	$ 533,000	$ 597,000