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Document and Entity Information
Nov. 19, 2024
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 19, 2024
Entity File Number 000-56269
Entity Registrant Name Marathon Bancorp, Inc. /MD/
Entity Central Index Key 0001835385
Entity Incorporation, State or Country Code MD
Entity Tax Identification Number 86-2191258
Entity Address, Address Line One 500 Scott Street
Entity Address, City or Town Wausau
Entity Address, State or Province WI
Entity Address, Postal Zip Code 54403
City Area Code 715
Local Phone Number 845-7331
Title of 12(b) Security NA
Trading Symbol NA
Entity Emerging Growth Company true
Entity Ex Transition Period false
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false