| Document And Entity Information | May 04, 2021 |
| Document And Entity Information [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 4, 2021 |
| Entity Registrant Name | FIDELITY D & D BANCORP, INC. |
| Entity Incorporation, State or Country Code | PA |
| Entity File Number | 001-38229 |
| Entity Tax Identification Number | 23-3017653 |
| Entity Address, Address Line One | Blakely and Drinker Streets |
| Entity Address, City or Town | Dunmore |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 18512 |
| City Area Code | 570 |
| Local Phone Number | 342-8281 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, no par value |
| Trading Symbol | FDBC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001098151 |
| Amendment Flag | false |
