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Employee Benefits - Deferred compensation plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Appreciation in cash surrender value of bank owned life insurance $ 621 $ 558 $ 596
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Director [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Interest rate on deferred amounts 2.68%    
Net deferrals included in accrued interest payable and other liabilities $ 3,713 3,440  
Cash surrender value of life insurance 3,375 3,297  
Appreciation in cash surrender value of bank owned life insurance 78 83 $ 105
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Certain Key Executives [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Net deferrals included in accrued interest payable and other liabilities $ 86 $ 52  
Maximum deferment of compensation each year 50.00%