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Off-balance sheet financial instruments - Summary of Contractual Amounts of Off-balance Sheet Commitments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Off-balance sheet financial instruments. |  |
Commitments to extend credit | $ 294,122 | $ 324,984
Unused portions of lines of credit | 51,790 | 56,244
Standby letters of credit | 33,275 | 23,387
Total contractual amounts of off-balance sheet commitments | $ 379,187 | $ 404,615

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- Definition The off-balance sheet commitment to extend credit. + References No definition available. + Details
Name: | pfis_CommitmentToExtendCredit
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The contractual amounts of off-balance sheet commitments. + References No definition available. + Details
Name: | pfis_ContractualAmountForOffBalanceSheetCommitments
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The off-balance sheet commitment for standby letters of credit. + References No definition available. + Details
Name: | pfis_StandbyLetterOfCredit
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The off-balance sheet commitment for unused portions of lines of credit. + References No definition available. + Details
Name: | pfis_UnusedLettersOfCredit
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration