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Employee Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Benefits (Textual)      
Maximum employee contribution of compensation received 4.00%    
Employer mmatching contribution, percent 100.00%    
Amount of Employer contributions charged to expense $ 500 $ 400 $ 400
Cash surrender value of all life insurance policies $ 16,479 $ 13,725  
Vesting period of company's contribution to each employee account 5 years    
Employee stock ownership plan (ESOP), number of allocated shares 449,635 466,442  
Employee stock ownership plan (ESOP), compensation expense $ 200 $ 300 200
Vesting period of matching contribution 3 years    
Description of supplemental executive retirement plan agreement with certain active and retired officers Agreements provide monthly payments for up to 15 years that equal 15 percent to 25 percent of average compensation prior to retirement or death.    
Expense charged under Supplemental Executive Retirement Plan agreements $ 200 $ 30 $ 200