Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2024	Nov. 04, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Trading Symbol	AFBI
Entity Registrant Name	Affinity Bancshares, Inc.
Entity Central Index Key	0001823406
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		6,412,430
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-39914
Entity Tax Identification Number	82-1147778
Entity Address, Address Line One	3175 Highway 278
Entity Address, City or Town	Covington
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	30014
City Area Code	770
Local Phone Number	786-7088
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock, par value $0.01 per share
Entity Incorporation, State or Country Code	MD
Document Quarterly Report	true
Document Transition Report	false
Security Exchange Name	NASDAQ