EMPLOYEE BENEFIT PLANS - Post-Retirement Healthcare Plan (Details) - Post-retirement benefit plan $ in Thousands	9 Months Ended
Mar. 31, 2022 USD ($)
Employee Benefit Plans
Threshold age for eligibility for retiree medical coverage	60 years
Minimum year of service for eligibility for retiree medical coverage	25 years
Minimum year of service required for eligibility for individual and spousal coverage	30 years
Monthly premium for individual coverage	$ 210
Monthly premium for employee and spousal coverage	$ 420

Represents the employer contribution for monthly premium for employee and spousal coverage.

No definition available.

Name:	pbfs_EmployerContributionMonthlyPremiumEmployeeAndSpousalCoverage
Namespace Prefix:	pbfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the employer contribution for monthly premium for individual coverage.

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No definition available.

+ Details

Name:	pbfs_EmployerContributionMonthlyPremiumIndividualCoverage
Namespace Prefix:	pbfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the minimum year of service required for eligibility for individual and spousal coverage.

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No definition available.

+ Details

Name:	pbfs_MinimumYearOfServiceForEligibilityForIndividualAndSpousalCoverage
Namespace Prefix:	pbfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the minimum number of year of service for eligibility for retiree medical coverage.

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No definition available.

+ Details

Name:	pbfs_MinimumYearOfServiceForEligibilityForRetireeMedicalCoverage
Namespace Prefix:	pbfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the threshold age for eligibility for retiree medical coverage.

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No definition available.

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Name:	pbfs_ThresholdAgeForEligibilityForRetireeMedicalCoverage
Namespace Prefix:	pbfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: