EMPLOYEE BENEFIT PLANS - 401(k) Plan (Details) - USD ($)	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019
EMPLOYEE BENEFIT PLANS
Percentage of match for first 1% of employee contributions	100.00%
Percentage of employee contribution on which 100% match by employer	1.00%
Percentage of match on next 5% of employee contributions	50.00%
Percentage of employee contribution on which 50% match by employer	5.00%
Contribution expense	$ 459,000	$ 411,000

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan one.

No definition available.

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

Percentage employer matches of the employee's percentage contribution matched one.

No definition available.

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

Percentage employer matches of the employee's percentage contribution matched two.

No definition available.

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

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan two.

No definition available.

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

No definition available.

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

Amount of discretionary contributions made by an employer to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration