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Merger accounting - Calculation of Consideration Effectively Transferred (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended |
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Dec. 31, 2013 | Nov. 30, 2013 Penseco Financial Services Corp [Member] | Nov. 30, 2013 Reverse Merger [Member] | Nov. 30, 2013 Reverse Merger [Member] Peoples Financial Services Corp [Member] | Nov. 30, 2013 Reverse Merger [Member] Penseco Financial Services Corp [Member]
Business Acquisition [Line Items] |  |  |  |  |
Shares outstanding |  |  | 3,275,217 | 3,087,406 | 3,275,217
Exchange ratio | 1.3636 | 1.3636 | 1.3636 |  |
Share to be issued to acquiree share holders |  |  | 4,465,538 |  |
Common shares to be outstanding |  |  | 7,552,944 |  |
Ownership percentage |  |  |  | 40.88% | 59.12%
Theoretical Penseco share to be issued as consideration |  |  |  |  |
Shares outstanding |  |  | 3,275,217 | 3,087,406 | 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 |  |  | $ 47.04 |  |
Fair value of theoretical shares offered |  |  | $ 106,519 |  |
Cash paid for fractional shares |  |  | 17 |  |
Total purchase price for accounting purposes |  |  | $ 106,536 |  |

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