Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Feb. 28, 2022	Jun. 30, 2021
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2021
Document Fiscal Year Focus	2021
Document Transition Report	false
Entity File Number	001-38229
Entity Registrant Name	FIDELITY D & D BANCORP, INC.
Entity Incorporation, State or Country Code	PA
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
Title of 12(b) Security	Common Stock, without par value
Trading Symbol	FDBC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 216.2
Entity Common Stock, Shares Outstanding		5,659,018
Documents Incorporated by Reference	Portions of the Registrant’s definitive Proxy Statement to be used in connection with the 2022 Annual Meeting of Shareholders are incorporated herein by reference in partial response to Part III.
Amendment Flag	false
Entity Central Index Key	0001098151
Document Fiscal Period Focus	FY
Auditor Firm ID	49
Auditor Name	RSM US LLP
Auditor Location	Blue Bell, Pennsylvania