Cover page - shares	3 Months Ended
	Mar. 31, 2021	May 14, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	000-12436
Entity Registrant Name	COLONY BANKCORP, INC.
Entity Incorporation, State or Country Code	GA
Entity Tax Identification Number	58-1492391
Entity Address, Address Line One	115 South Grant Street
Entity Address, City or Town	Fitzgerald
Entity Address, State or Province	GA
Entity Address, Postal Zip Code	31750
City Area Code	229
Local Phone Number	426-6000
Title of 12(b) Security	Common Stock, Par Value $1.00 per share
Trading Symbol	CBAN
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 (in shares)		9,498,783
Entity Central Index Key	0000711669
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Amendment Flag	false