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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
Dec. 31, 2015
Schedule of Capitalization              
Percentage of capital stock           100.00%  
Payment of dividends description           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 of accumulated net earnings acquired as a result of merger related to dividend           7 years  
Funds available for transfers           $ 20,593,000  
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              
Percentage of funds transfer to affiliate           10.00%  
Capital conservation buffer           0.625%  
Minimum              
Schedule of Capitalization              
Percentage of net earnings to surplus funds           10.00%  
Quarterly cash dividend per share           $ 0.31