v3.25.2
Cover - shares
 6 Months Ended
Jun. 30, 2025
Aug. 08, 2025
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Information [Line Items]    
Entity Registrant Name MUNCY COLUMBIA FINANCIAL CORPORATION  
Entity Central Index Key 0000731122  
Entity File Number 000-19028  
Entity Tax Identification Number 23-2254643  
Entity Incorporation, State or Country Code PA  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Contact Personnel [Line Items]    
Entity Address, Address Line One 232 East Street  
Entity Address, City or Town Bloomsburg  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 17815  
Entity Phone Fax Numbers [Line Items]    
City Area Code (570)  
Local Phone Number 784-4400  
Entity Listings [Line Items]    
Entity Common Stock, Shares Outstanding   3,534,998