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Employee Benefits - Deferred compensation plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Appreciation in cash surrender value of bank owned life insurance $ 728 $ 695 $ 621
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 $ 4,177 3,842  
Cash surrender value of life insurance 9,686 9,436  
Appreciation in cash surrender value of bank owned life insurance 250 249 $ 255
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 $ 145 $ 129  
Maximum deferment of compensation each year 50.00%