EMPLOYEE BENEFIT PLANS - Additional Information (Details)	12 Months Ended
Jun. 30, 2020
Employee Benefit Plans
Estimated long-term inflation rate	2.50%
Minimum
Employee Benefit Plans
Rates of return	5.00%
Equity securities
Employee Benefit Plans
Target allocation percentage	65.00%
Equity securities \| Maximum
Employee Benefit Plans
Rates of return	9.00%
Fixed income securities
Employee Benefit Plans
Target allocation percentage	35.00%
Fixed income securities \| Minimum
Employee Benefit Plans
Rates of return	1.00%
Fixed income securities \| Maximum
Employee Benefit Plans
Rates of return	4.00%

Represents the estimated long-term inflation rate under defined benefit plan.

No definition available.

Name:	pbfs_DefinedBenefitPlanPlanAssetsEstimatedLongTermInflationRate
Namespace Prefix:	pbfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the rates of return assumed to earn under defined benefit plan.

+ References

No definition available.

+ Details

Name:	pbfs_DefinedBenefitPlanPlanAssetsRateOfReturn
Namespace Prefix:	pbfs_
Data Type:	num:percentItemType
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.

+ References

No definition available.

+ Details

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

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_FixedIncomeInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: