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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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Adjustments to reflect liabilities acquired at fair value [Abstract]        
Goodwill resulting from merger   $ 31,376 $ 31,376  
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. $ 19,228      
Purchase Price Consideration - Cash for Common Stock [Abstract]        
Purchase price assigned to MidCoast common shares exchanged for cash 7,615      
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 0   $ 0
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 $ 0   $ 0