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Merger accounting - Summary of Acquired Nonimpaired and Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Acquired Non Impaired Loans [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Contractually required principal and interest at acquisition | $ 501,423 pfis_ContractuallyRequiredPrincipalAndInterestAtAcquisition / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredNonImpairedLoansMember
Expected cash flows at acquisition | 501,423 us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredNonImpairedLoansMember
Interest component of expected cash flows (accretable discount) | (4,773)pfis_InterestComponentOfExpectedCashFlows / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredNonImpairedLoansMember
Fair value of acquired loans | 496,650 pfis_BusinessAcquisitionPurchasePriceAllocationLoansAcquiredAtFairValue / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredNonImpairedLoansMember
Acquired Impaired Loans [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Contractually required principal and interest at acquisition | 19,353 pfis_ContractuallyRequiredPrincipalAndInterestAtAcquisition / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredImpairedLoansMember
Contractual cash flows not expected to be collected (nonaccretable discount) | (10,873)pfis_ContractualCashFlowsNotExpectedToBeCollected / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredImpairedLoansMember
Expected cash flows at acquisition | 8,480 us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredImpairedLoansMember
Interest component of expected cash flows (accretable discount) | (1,128)pfis_InterestComponentOfExpectedCashFlows / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredImpairedLoansMember
Fair value of acquired loans | $ 7,352 pfis_BusinessAcquisitionPurchasePriceAllocationLoansAcquiredAtFairValue / us-gaap_BusinessAcquisitionAxis = pfis_AcquiredImpairedLoansMember

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- Definition Business Acquisition Purchase Price Allocation Loans Acquired At Fair Value + References No definition available. + Details
Name: | pfis_BusinessAcquisitionPurchasePriceAllocationLoansAcquiredAtFairValue
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contractual Cash Flows Not Expected To Be Collected + References No definition available. + Details
Name: | pfis_ContractualCashFlowsNotExpectedToBeCollected
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contractually Required Principal And Interest At Acquisition + References No definition available. + Details
Name: | pfis_ContractuallyRequiredPrincipalAndInterestAtAcquisition
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Interest Component Of Expected Cash Flows + References No definition available. + Details
Name: | pfis_InterestComponentOfExpectedCashFlows
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cash flows expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
Name: | us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=pfis_AcquiredImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=pfis_AcquiredNonImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |