| Cover | Aug. 02, 2021 | Jun. 28, 2021 | Apr. 22, 2021 |
| Cover [Abstract] | |||
| Document Type | 8-K | ||
| Document Period End Date | Aug. 2, 2021 | ||
| Entity Registrant Name | COLONY BANKCORP, INC | ||
| Entity Incorporation, State or Country Code | GA | ||
| Entity File Number | 000-12436 | ||
| Entity Tax Identification Number | 58-1492391 | ||
| Entity Address, Address Line One | 115 South Grant Street | ||
| Entity Address, City or Town | Fitzgerald | ||
| Entity Address, Postal Zip Code | 31750 | ||
| City Area Code | 229 | ||
| Local Phone Number | 426-6000 | ||
| Written Communications | true | ||
| Soliciting Material | true | ||
| Pre-commencement Tender Offer | false | ||
| Pre-commencement Issuer Tender Offer | false | ||
| Title of 12(b) Security | Common stock, par value $1.00 per share | ||
| Trading Symbol | CBAN | ||
| Security Exchange Name | NASDAQ | ||
| Entity Emerging Growth Company | false | ||
| Entity Central Index Key | 0000711669 | ||
| Amendment Flag | false | ||
| Entity Address, State or Province | GA |
