| Cover | Nov. 11, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | On November 16, 2023, MCFC filed a Current Report on Form 8-K reporting the completion of the Mergers (the “Original Report”). This Amendment No. 1 to the Original Report is being filed with the Securities and Exchange Commission (the “Commission”) solely to amend and supplement Item 9.01 of the Original Report, as described in Item 9.01 below. This Amendment No. 1 makes no other amendments to the Original Report. |
| Document Period End Date | Nov. 11, 2023 |
| Entity File Number | 000-19028 |
| Entity Registrant Name | MUNCY COLUMBIA FINANCIAL CORPORATION |
| Entity Central Index Key | 0000731122 |
| Entity Tax Identification Number | 23-2254643 |
| Entity Incorporation, State or Country Code | PA |
| 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 | 232 East Street, Bloomsburg, Pennsylvania 17815 |
| City Area Code | (570) |
| Local Phone Number | 784-4400 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | None |
| Trading Symbol | None |
| Entity Emerging Growth Company | false |
| Entity Information, Former Legal or Registered Name | Not Applicable |
