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Summary of significant accounting policies - Visa Class B Common Stock Sale (Details) - USD ($)		1 Months Ended		9 Months Ended		12 Months Ended
	Oct. 08, 2021	Oct. 31, 2021	Mar. 31, 2008	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2008
Gain on sale of investments					$ 724,000
Visa Class B stock
Number of shares sold	44,982	44,982
Purchase price	$ 12,200,000
Carrying value	$ 0
Number of shares purchased			73,333
Number of shares redeemed						28,351
Gain on sale of investments				$ 9,600,000

X

- Definition

The carrying value of investment owned.

+ References

No definition available.

+ Details

Name:	pfis_InvestmentOwnedCarryingValue
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Number of investment owned shares purchased.

+ References

No definition available.

+ Details

Name:	pfis_InvestmentOwnedSharesPurchased
Namespace Prefix:	pfis_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of investment owned shares redeemed.

+ References

No definition available.

+ Details

Name:	pfis_InvestmentOwnedSharesRedeemed
Namespace Prefix:	pfis_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of investment owned shares sold.

+ References

No definition available.

+ Details

Name:	pfis_InvestmentOwnedSharesSold
Namespace Prefix:	pfis_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of consideration for sale of investment owned shares.

+ References

No definition available.

+ Details

Name:	pfis_InvestmentOwnedSharesSoldConsideration
Namespace Prefix:	pfis_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(3)(a))
-URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(13))
-URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(9)(a))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(b)(7)(c))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: