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Acquisition of MidCoast Community Bancorp, Inc, Summarizes The Purchase of Midcoast (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Apr. 17, 2020
Sep. 30, 2020
Dec. 31, 2019
Adjustments to reflect liabilities acquired at fair value [Abstract]      
Goodwill resulting from merger [1]   $ 31,376 $ 23,296
MidCoast Community Bancorp, Inc [Member]      
Purchase Price Consideration in Common Stock [Abstract]      
Citizens Financial Services, Inc. shares issued (in shares) 373,356    
Value assigned to Citizens Financial Services, Inc. common share (in dollars per share) $ 51.50    
Purchase price assigned to MidCoast common shares exchanged for Citizens Financial Services, Inc. $ 19,227    
Purchase Price Consideration - Cash for Common Stock [Abstract]      
Purchase price assigned to The First National Bank of Fredericksburg common shares exchanged for cash 7,616    
Total Purchase Price 26,843    
Net Assets Acquired [Abstract]      
MidCoast Community Bancorp, Inc shareholders' equity 24,330    
Adjustments to reflect assets acquired at fair value [Abstract]      
Investments    
Loans [Abstract]      
Interest rate 1,424    
General credit (4,375)    
Specific credit - non-amortizing (2,135)    
Specific credit - amortizing (966)    
Core deposit intangible 157    
Owned premises (426)    
Other assets 65    
Deferred tax assets 2,217    
Adjustments to reflect liabilities acquired at fair value [Abstract]      
Time deposits (1,018)    
Borrowings (497)    
Other liabilities (13)    
Net assets acquired 18,763    
Goodwill resulting from merger $ 8,080    
[1] Excludes fully amortized intangible assets