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Merger accounting - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2013
Directors
Dec. 31, 2012
Dec. 31, 2011
Nov. 30, 2013
Dec. 31, 2013
Historical Peoples Financial Services Corp [Member]
Directors
Nov. 30, 2013
Penseco Financial Services Corp [Member]
Dec. 31, 2013
Penseco Financial Services Corp [Member]
Directors
Dec. 31, 2013
Penseco Financial Services Corp [Member]
Minimum [Member]
Dec. 31, 2013
Peoples Financial Services Corp [Member]
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 14       6   8    
Percentage of ownership 59.10%                
Exchange ratio 1.3636         1.3636      
Penseco contribution             Penseco contributed greater than fifty percent of the total assets and tangible equity to the combined entity.    
Percentage of contribution of total assets and tangible equity               50.00%  
Purchase price per share           $ 34.50      
Common stock were retired           9,928      
Goodwill resulting from merger $ 63,370 $ 26,398   $ 36,972          
Tax deductible goodwill in the transaction       0          
Fair value of acquisition of loan portfolio 496,650                
Estimated useful life of intangible assets 10 years                
Merger related costs 4,609                  
Net interest income after loan loss provision 52,734 52,917 51,312           2,248
Noninterest income 16,080 16,287 18,186           363
Noninterest expense 52,295 49,827 56,319           3,115
Net income attributable to parent $ 16,519 $ 19,377 $ 13,179           $ (261)