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Retirement Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Retirement Plans [Abstract]    
Maximum contribution percentage of pretax annual compensation 19.00%  
Defined contribution benefit plan, company contribution $ 270 $ 253
SERP expense 331 230
Cash surrender values of life insurance policies $ 13,018 $ 12,673