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Employee Benefits - Deferred compensation plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Appreciation in cash surrender value of bank owned life insurance $ 695 $ 621 $ 558
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 3.12%    
Net deferrals included in accrued interest payable and other liabilities $ 3,842 3,713  
Cash surrender value of life insurance 9,436 9,187  
Appreciation in cash surrender value of bank owned life insurance 249 255 $ 242
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 $ 129 $ 86  
Maximum deferment of compensation each year 50.00%