| Document and Entity Information | May 18, 2021 |
| Document and Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 18, 2021 |
| Entity File Number | 0-13232 |
| Entity Registrant Name | JUNIATA VALLEY FINANCIAL CORP. |
| Entity Incorporation, State or Country Code | PA |
| Entity Tax Identification Number | 23-2235254 |
| Entity Address, Address Line One | Bridge and Main Streets |
| Entity Address, City or Town | Mifflintown |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 17059 |
| City Area Code | 855 |
| Local Phone Number | 582-5101 |
| 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 |
| Security Exchange Name | NONE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000714712 |
| Amendment Flag | false |
