SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other (Details)	12 Months Ended
Jun. 30, 2020 Office
Nature of Operations and Principals of Consolidation
Number of offices in Capital Region of New York	22

Represents the number of offices in Capital Region of New York.

No definition available.

Name:	pbfs_NumberOfOfficesInCapitalRegion
Namespace Prefix:	pbfs_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration