Regulatory matters - Additional Information (Details) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Schedule of Capitalization [Line Items]
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
Loans outstanding	$ 0	$ 0
Advances made	$ 0	$ 0
Maximum [Member]
Schedule of Capitalization [Line Items]
Percentage of funds transfer to affiliate	10.00%
Minimum [Member]
Schedule of Capitalization [Line Items]
Percentage of net earnings to surplus funds	10.00%
Quarterly cash dividend per share	$ 0.31

Schedule of Capitalization [Line Items]

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.

$ 0

Percentage of funds transfer to affiliate

10.00%

Schedule of Capitalization [Line Items]

Quarterly cash dividend per share

$ 0.31