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Merger accounting - Additional Information (Details)
 12 Months Ended
Nov. 30, 2013
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
director
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]        
Date of Merger   Jun. 28, 2013    
Effective date of Merger Agreement   Dec. 01, 2013    
Number of members in Board of Directors | director   14    
Percentage of ownership   59.10%    
Exchange ratio   1.3636    
Goodwill resulting from merger $ 36,972,000 $ 63,370,000 $ 63,370,000  
Tax deductible goodwill in the transaction $ 0      
Fair value of acquisition of loan portfolio   $ 496,650,000    
Estimated useful life of intangible assets   10 years    
Merger related costs   $ 0 1,725,000 $ 4,609,000
Net interest income after loan loss provision     52,734,000 52,917,000
Noninterest income     16,080,000 16,287,000
Noninterest expense     52,295,000 49,827,000
Net loss attributable to parent     $ 16,519,000 19,377,000
Historical Peoples Financial Services Corp [Member]        
Business Acquisition [Line Items]        
Number of members in Board of Directors | director   6    
Penseco Financial Services Corp [Member]        
Business Acquisition [Line Items]        
Number of members in Board of Directors | director   8    
Exchange ratio 1.3636      
Penseco contribution   Penseco contributed greater than fifty percent of the total assets and tangible equity to the combined entity.    
Purchase price per share | $ / shares $ 34.50      
Common stock were retired | shares 9,928      
Penseco Financial Services Corp [Member] | Minimum [Member]        
Business Acquisition [Line Items]        
Percentage of contribution of total assets and tangible equity   50.00%    
Peoples Financial Services Corp [Member]        
Business Acquisition [Line Items]        
Net interest income after loan loss provision       2,248,000
Noninterest income       363,000
Noninterest expense       3,115,000
Net loss attributable to parent       $ (261,000)