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Short-term borrowings (Details Textual)
 12 Months Ended
Dec. 31, 2018
USD ($)
Bank
Dec. 31, 2017
USD ($)
Line Of Credit Facility [Line Items]    
Maturity of repurchase agreements 89 days  
Securities Sold under Agreements to Repurchase and Other Short Term Borrowings (Additional Textual) [Abstract]    
Interest rate, effective percentage 5.50% 4.50%
Domestic Line of Credit    
Line Of Credit Facility [Line Items]    
Access to lines of credit at domestic banks $ 35,000,000  
Number of domestic banks | Bank 2  
Unsecured revolving line of credit, outstanding balance $ 0 $ 0
Revolving Credit Facility    
Line Of Credit Facility [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
Revolving Credit Facility | Farmers National Banc Corp | Unsecured Debt    
Line Of Credit Facility [Line Items]    
Unsecured revolving line of credit, outstanding balance $ 6,500,000  
Letter of Credit    
Line Of Credit Facility [Line Items]    
Unsecured revolving line of credit, outstanding balance $ 350,000 350,000
Debt Instrument, Interest Rate, Stated Percentage 3.50%  
US Treasury and Government Short-term Debt Securities    
Line Of Credit Facility [Line Items]    
Pledged securities, percentage of repurchase agreement balances 105.00%  
Carrying amount of securities sold under repurchase agreement $ 4,600,000 $ 77,900,000