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Employee Benefits - Salary continuation plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Appreciation in cash surrender value of bank owned life insurance $ 621 $ 558 $ 596
Annual tax free interest rate on life insurance policies 3.97%    
Salary Continuation [Member] | Certain Key Executives [Member]      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Contractual term 15 years    
Salary continuation plans, expense for period $ 561 489 447
Total liability 5,786 5,572  
Cash surrender value of life insurance 6,355 6,196  
Appreciation in cash surrender value of bank owned life insurance 159 159 167
Salary Continuation [Member] | Service 1st Bank | Certain Key Executives [Member]      
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]      
Salary continuation plans, expense for period 163 120 78
Total liability 4,557 2,788  
Cash surrender value of life insurance 15,326 11,014  
Appreciation in cash surrender value of bank owned life insurance $ 315 $ 298 $ 194