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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 |

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