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Retirement Agreements and Other Postretirement Benefit Plan Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Service cost – benefits earned during the year $ 0 $ 0 $ 10
Interest cost on the projected benefit obligation 32 37 35
Amortization of unrecognized prior service cost 0 0 0
Amortization of unrecognized loss 0 9 9
Net periodic benefits cost at end of year $ 32 $ 46 $ 54