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NATURE OF OPERATIONS - Mutual Holding Company Reorganization and Minority Stock Issuance (Details) - USD ($)		3 Months Ended	6 Months Ended
	Jul. 17, 2019	Dec. 31, 2020	Dec. 31, 2019
Schedule of Capitalization, Equity [Line Items]
Net proceeds from sale of stock			$ 109,055,000
Stock contributed to Pioneer Bank Charitable Foundation (in shares)	519,554
Cash contributed to Pioneer Bank Charitable Foundation	$ 250,000
Initial Public Offering
Schedule of Capitalization, Equity [Line Items]
Sale of stock (in shares)	11,170,402
Share price	$ 10.00
Net proceeds from sale of stock	$ 109,100,000
Pioneer Bank ESOP
Schedule of Capitalization, Equity [Line Items]
Numbers of shares owned by ESOP		1,018,325	1,018,325
Pioneer Bancorp, MHC
Schedule of Capitalization, Equity [Line Items]
Sale of stock (in shares)	14,287,723
Ownership interest (as a percent)		55.00%

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