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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
	Dec. 31, 2014	Nov. 30, 2013
Business Acquisition [Line Items]
Exchange ratio	1.3636
Theoretical Penseco share to be issued as consideration
Total purchase price for accounting purposes		106,536pfis_PurchasePriceOfBusinessAcquisition
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		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