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Regulatory matters - Additional Information (Details) - USD ($)
 12 Months Ended
Jan. 01, 2016
Jan. 01, 2015
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Capitalization            
Capital stock (as a percent)         100.00%  
Description of payment of dividends         The Penseco merger agreement contemplates that, unless 80 percent of our Board of Directors determines otherwise, the Company will pay a quarterly cash dividend in an amount no less than $0.31 per share through 2018, provided that sufficient funds are legally available, and that the Company and Peoples Bank remain "well-capitalized" in accordance with applicable regulatory guidelines.  
Period over which the Company may only declare and pay dividends out of accumulated net earnings, including accumulated net earnings acquired as a result of a merger         7 years  
Funds available for transfers         $ 21,968,000  
Loans outstanding         $ 0 $ 0
Phase in period for capital conservation buffer 4 years          
Capital conservation buffer   2.50% 2.50% 1.875% 1.25%  
Maximum            
Schedule of Capitalization            
Net earnings which must set aside as a surplus (as a percent)         10.00%  
Capital conservation buffer         0.625%  
Minimum            
Schedule of Capitalization            
Net earnings to surplus funds (as a percent)         10.00%  
Quarterly cash dividend per share         $ 0.31