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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Nonrecurring Fair Value Measurements [Member], USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	20.70%	20.70%
Range and weighted average of liquidation expenses	4.40%	4.40%
Other Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	17.00%	17.00%
Range and weighted average of liquidation expenses	3.00%	3.00%
Other Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	24.00%	24.00%
Range and weighted average of liquidation expenses	6.00%	6.00%
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	22.90%	17.30%
Range and weighted average of liquidation expenses	5.60%	5.00%
Impaired Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	2.60%	11.00%
Range and weighted average of liquidation expenses	3.00%	3.00%
Impaired Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	74.00%	33.70%
Range and weighted average of liquidation expenses	6.00%	6.00%
Significant Unobservable Inputs (Level 3) [Member] | Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Estimate	$ 285	$ 437
Valuation Techniques	Appraisal of collateral
Unobservable Input	Appraisal adjustments
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Estimate	$ 1,826	$ 2,354
Valuation Techniques	Appraisal of collateral
Unobservable Input	Appraisal adjustments

X

- Definition

Represents the range and weighted average of appraisal adjustments presented as a percent of the appraisal.

+ References

No definition available.

+ Details

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Namespace Prefix:	pfis_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the range and weighted average of liquidation expenses presented as a percent of the appraisal.

+ References

No definition available.

+ Details

Name:	pfis_RangeAndWeightedAverageOfLiquidationExpenses
Namespace Prefix:	pfis_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value disclosure of unobservable input used for assets fair value measurement at the end of the period.

+ References

No definition available.

+ Details

Name:	pfis_UnobservableInput
Namespace Prefix:	pfis_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The technique used by the entity to measure fair value of assets at the end of the period.

+ References

No definition available.

+ Details

Name:	pfis_ValuationTechnique
Namespace Prefix:	pfis_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration