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Fair Value Measurements - Summary of Fair Value Assets Measured on Nonrecurring Basis (Details) - Nonrecurring Basis [Member] - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Total Fair Value [Member] |  |
Nonrecurring basis [Abstract] |  |
Impaired loans | $ 0 | $ 3,105
Foreclosed real estate | 58 | 0
Level 1 [Member] |  |
Nonrecurring basis [Abstract] |  |
Impaired loans | 0 | 0
Foreclosed real estate | 0 | 0
Level 2 [Member] |  |
Nonrecurring basis [Abstract] |  |
Impaired loans | 0 | 0
Foreclosed real estate | 0 | 0
Level 3 [Member] |  |
Nonrecurring basis [Abstract] |  |
Impaired loans | 0 | 3,105
Foreclosed real estate | $ 58 | $ 0

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This element represents the fair value of foreclosed assets categorized as other which are not in and of themselves material enough to require separate disclosure. + References No definition available. + Details
Name: | pbhc_ForeclosedRealEstateFairValueDisclosure
Namespace Prefix: | pbhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents impaired loans as presented on the statement of financial position which may include mortgage loans, finance receivables, or any other impaired loans which are due to the Company as of the balance sheet date. + References No definition available. + Details
Name: | pbhc_ImpairedLoansFairValueDisclosure
Namespace Prefix: | pbhc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nonrecurring basis [Abstract] + References No definition available. + Details
Name: | pbhc_NonrecurringBasisAbstract
Namespace Prefix: | pbhc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |