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Merger accounting - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 Directors | Dec. 31, 2012 | Dec. 31, 2011 | Nov. 30, 2013 | Dec. 31, 2013 Historical Peoples Financial Services Corp [Member] Directors | Nov. 30, 2013 Penseco Financial Services Corp [Member] | Dec. 31, 2013 Penseco Financial Services Corp [Member] Directors | Dec. 31, 2013 Penseco Financial Services Corp [Member] Minimum [Member] | Dec. 31, 2013 Peoples Financial Services Corp [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Date of Merger | Jun. 28, 2013 |  |  |  |  |  |  |  |
Effective date of Merger Agreement | Dec. 01, 2013 |  |  |  |  |  |  |  |
Number of members in Board of Directors | 14 |  |  |  | 6 |  | 8 |  |
Percentage of ownership | 59.10% |  |  |  |  |  |  |  |
Exchange ratio | 1.3636 |  |  |  |  | 1.3636 |  |  |
Penseco contribution |  |  |  |  |  |  | Penseco contributed greater than fifty percent of the total assets and tangible equity to the combined entity. |  |
Percentage of contribution of total assets and tangible equity |  |  |  |  |  |  |  | 50.00% |
Purchase price per share |  |  |  |  |  | $ 34.50 |  |  |
Common stock were retired |  |  |  |  |  | 9,928 |  |  |
Goodwill resulting from merger | $ 63,370 | $ 26,398 |  | $ 36,972 |  |  |  |  |
Tax deductible goodwill in the transaction |  |  |  | 0 |  |  |  |  |
Fair value of acquisition of loan portfolio | 496,650 |  |  |  |  |  |  |  |
Estimated useful life of intangible assets | 10 years |  |  |  |  |  |  |  |
Merger related costs | 4,609 |  |  |  |  |  |  |  |
Net interest income after loan loss provision | 52,734 | 52,917 | 51,312 |  |  |  |  |  | 2,248
Noninterest income | 16,080 | 16,287 | 18,186 |  |  |  |  |  | 363
Noninterest expense | 52,295 | 49,827 | 56,319 |  |  |  |  |  | 3,115
Net income attributable to parent | $ 16,519 | $ 19,377 | $ 13,179 |  |  |  |  |  | $ (261)

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