Document and Entity Information - shares	6 Months Ended
	Dec. 31, 2022	Feb. 07, 2023
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2022
Document Transition Report	false
Entity File Number	001-38991
Entity Registrant Name	Pioneer Bancorp, Inc./MD
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	83-4274253
Entity Address, Address Line One	652 Albany Shaker Road
Entity Address, City or Town	Albany
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	12211
City Area Code	518
Local Phone Number	730-3025
Title of 12(b) Security	Common Stock, par value $0.01
Trading Symbol	PBFS
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		25,977,679
Entity Central Index Key	0001769663
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q2
Amendment Flag	false