Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Aug. 05, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	001-36706
Entity Registrant Name	CB FINANCIAL SERVICES, INC.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	51-0534721
Entity Address, Address Line One	100 N. Market Street
Entity Address, City or Town	Carmichaels
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	15320
City Area Code	724
Local Phone Number	966-5041
Title of 12(b) Security	Common stock, par value $0.4167 per share
Trading Symbol	CBFV
Security Exchange Name	NASDAQ
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
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		5,380,165
Entity Central Index Key	0001605301
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false