v3.25.4
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 06, 2026
Jun. 30, 2025
Document and Entity Information      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Securities Act 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 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     $ 121.4
Entity Common Stock, Shares Outstanding   25,076,801  
Documents Incorporated by Reference

The registrant incorporates by reference its definitive Proxy Statement with respect to its 2026 Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission within 120 days following the end of its fiscal year, into (Part III) of this Annual Report on Form 10-K.

    
Entity Central Index Key 0001769663    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Auditor Name Bonadio & Co., LLP    
Auditor Location Pittsford, New York    
Auditor Firm ID 1884