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Retirement Plans SERP (Details) - Supplemental Employee Retirement Plans, Defined Benefit - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 Costs $ 43,000 $ 29,000 $ 15,000
Pension and Other Postretirement Defined Benefit Plans, Liabilities $ 658,000 $ 715,000