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Loans, net and allowance for loan losses - Net Deferred Loan Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans, net and allowance for loan losses
Net deferred loan costs	$ 719	$ 575

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- Definition

Net deferred loan costs included in loan balances.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration