Document and Entity Information - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2024	Mar. 07, 2025	Jun. 30, 2024
Document and Entity Information
Document Type	10-KT
Document Annual Report	false
Document Transition Report	true
Document Period Start Date	Jul. 01, 2024
Document Period End Date	Dec. 31, 2024
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, Postal Zip Code	12211
Entity Address, Address Line One	652 Albany Shaker Road
Entity Address, City or Town	Albany
Entity Address, State or Province	NY
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 107,770
Entity Common Stock, Shares Outstanding		25,848,091
Entity Central Index Key	0001769663
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Auditor Name	Bonadio & Co., LLP
Auditor Location	Pittsford, New York
Auditor Firm ID	1884