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Loans, net and allowance for credit losses - Net Deferred Loan Costs (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Net deferred loan costs	$ 2,100	$ 1,700
Unearned income	1,400	1,300
Net loans	3,956,635	3,951,729
Federal Home Loan Bank (FHLB)
Amount of credit facility used to issue standby letters of credit to collateralize public fund deposits	$ 345,900	$ 487,800

X

- Definition

Net deferred loan costs included in loan balances.

+ References

No definition available.

+ Details

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

X

- Definition

Unearned income on restricted stock issued.

+ References

No definition available.

+ Details

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

X

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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Balance Type:	debit
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X

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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X

- Details

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