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Employee Benefits - Deferred compensation plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Appreciation in cash surrender value of bank owned life insurance $ 711 $ 728 $ 695
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 2.49%    
Net deferrals included in accrued interest payable and other liabilities $ 4,292 4,177  
Cash surrender value of life insurance 9,464 9,686  
Appreciation in cash surrender value of bank owned life insurance 245 250 $ 249
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 $ 209 $ 145  
Maximum deferment of compensation each year 50.00%