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Fair value estimates - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring Fair Value Measurements [Member], USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
U.S. Treasury securities | $ 48,061 |
U.S. Government-sponsored enterprises | 101,252 | 113,045
State and Municipals: |  |
Taxable | 17,236 | 16,698
Tax-exempt | 94,106 | 98,081
Corporate debt securities |  | 4,387
Mortgage-backed securities: |  |
U.S. Government agencies | 39,511 | 20,433
U.S. Government-sponsored enterprises | 50,659 | 45,974
Common equity securities |  | 1,097
Total | 350,825 | 299,715
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
U.S. Treasury securities | 48,061 |
U.S. Government-sponsored enterprises |  |
State and Municipals: |  |
Taxable |  |
Tax-exempt |  |
Corporate debt securities |  |
Mortgage-backed securities: |  |
U.S. Government agencies |  |
U.S. Government-sponsored enterprises |  |
Common equity securities |  | 1,097
Total | 48,061 | 1,097
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
U.S. Government-sponsored enterprises | 101,252 | 113,045
State and Municipals: |  |
Taxable | 17,236 | 16,698
Tax-exempt | 94,106 | 98,081
Corporate debt securities |  | 4,387
Mortgage-backed securities: |  |
U.S. Government agencies | 39,511 | 20,433
U.S. Government-sponsored enterprises | 50,659 | 45,974
Common equity securities |  |
Total | 302,764 | 298,618
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
U.S. Government-sponsored enterprises |  |
State and Municipals: |  |
Taxable |  |
Tax-exempt |  |
Corporate debt securities |  |
Mortgage-backed securities: |  |
U.S. Government agencies |  |
U.S. Government-sponsored enterprises |  |
Common equity securities |  |
Total |  |

X
- Definition Fair value disclosure of Common equity securities at the end of the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value disclosure of corporate debt securities. + References No definition available. + Details
Name: | pfis_CorporateDebtSecuritiesFairValueDisclosure
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
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Namespace Prefix: | pfis_
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Balance Type: | na
Period Type: | duration

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- Definition Fair value disclosure of U. S. government-sponsored agencies securities mortgaged backed securities at the end of the period. + References No definition available. + Details
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Namespace Prefix: | pfis_
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X
- Details
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- Definition Fair value disclosure of taxable state and municipals securities. + References No definition available. + Details
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Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Fair value disclosure of tax-exempt state and municipals securities. + References No definition available. + Details
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Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition United States Treasury Securities Fair Value Disclosure + References No definition available. + Details
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Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Fair value disclosure of U. S. government-sponsored agencies securities at the end of the period. + References No definition available. + Details
Name: | pfis_USGovernmentSponsoredEnterprisesFairValueDisclosure
Namespace Prefix: | pfis_
Data Type: | xbrli:monetaryItemType
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Mortgage-Backed Securities -URI http://asc.fasb.org/extlink&oid=6517959 + Details
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