Long-Term Borrowings (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Long-term Borrowings (Additional Textual) [Abstract]    
Long-term advances $ 20,054 $ 18,381
Residential mortgage loans 237,800 $ 110,300
Additional borrowing limit 63,400  
Long-term investments $ 2,100  
Interest rate 2.20%  
Debt interest rate payment description The debt has a floating rate that is determined quarterly based on the three-month LIBOR  
Notes payable $ 2,100  
Debenture maturity date Dec. 15, 2036  
Farmers National Banc Corp    
Long-term Borrowings (Additional Textual) [Abstract]    
Long-term advances $ 8,000  
Fixed-rate constant payment advances    
Long-term Borrowings (Textual) [Abstract]    
Federal Home Loan Bank interest rate from 0.61% 0.61%
Federal Home Loan Bank interest rate to 4.88% 4.88%
Long-term Borrowings (Additional Textual) [Abstract]    
Long-term advances $ 15,054 $ 8,381
Convertible and putable fixed-rate advances    
Long-term Borrowings (Textual) [Abstract]    
Federal Home Loan Bank interest rate from 2.82% 2.82%
Federal Home Loan Bank interest rate to 4.45% 4.45%
Long-term Borrowings (Additional Textual) [Abstract]    
Long-term advances $ 5,000 $ 10,000
Fixed-rate advances    
Long-term Borrowings (Additional Textual) [Abstract]    
Retained amount of putable FHLB fixed-rate advances $ 5,000