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Pension and Postretirement Benefits - Additional Information (Details)	3 Months Ended
	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