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Merger accounting - Calculation of Consideration Effectively Transferred (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2013 USD ($) $ / shares shares | Dec. 31, 2015 shares | Dec. 31, 2014 shares
Business Acquisition [Line Items] |  |  |
Shares outstanding |  | 7,410,606 | 7,548,358
Exchange ratio |  | 1.3636 |
Theoretical Penseco share to be issued as consideration |  |  |
Shares outstanding |  | 7,410,606 | 7,548,358
Total purchase price for accounting purposes | $ | $ 106,536 |  |
Penseco Financial Services Corp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Exchange ratio | 1.3636 |  |
Reverse Merger [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Shares outstanding | 3,275,217 |  |
Exchange ratio | 1.3636 |  |
Share to be issued to acquiree share holders | 4,465,538 |  |
Common shares to be outstanding | 7,552,944 |  |
Theoretical Penseco share to be issued as consideration |  |  |
Shares outstanding | 3,275,217 |  |
Ownership % to be owned by current acquiree's shareholders | 59.12% |  |
Theoretical shares after consideration paid | 5,539,653 |  |
Ownership by legacy acquirer's shareholders | 40.88% |  |
Theoretical Penseco shares issued as consideration | 2,264,436 |  |
Fair value of acquiree's shares | $ / shares | $ 47.04 |  |
Fair value of theoretical shares | $ | $ 106,519 |  |
Cash paid for fractional shares | $ | 17 |  |
Total purchase price for accounting purposes | $ | $ 106,536 |  |
Reverse Merger [Member] | Peoples Financial Services Corp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Shares outstanding | 3,087,406 |  |
Ownership percentage | 40.88% |  |
Theoretical Penseco share to be issued as consideration |  |  |
Shares outstanding | 3,087,406 |  |
Reverse Merger [Member] | Penseco Financial Services Corp [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Shares outstanding | 3,275,217 |  |
Ownership percentage | 59.12% |  |
Theoretical Penseco share to be issued as consideration |  |  |
Shares outstanding | 3,275,217 |  |

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