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v3.20.1

Pension and Postretirement Benefits - Additional Information (Details) | 3 Months Ended
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Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract] |
Minimum years of service to participate in the health and life insurance benefits as of January 1, 1995 | 14 years

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- Definition Minimum years of service to participate in health and life insurance benefits. + References No definition available. + Details
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Namespace Prefix: | pbhc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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