Financial Information of Colony Bankcorp, Inc. (Parent Only) - Statements of Operations, Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Interest income
Total interest income	$ 63,125	$ 60,483
Expenses
Salaries and employee benefits	34,141	26,218
Income before income taxes	14,630	12,609
Income tax benefit	2,815	2,398
Net income	11,815	10,211
Parent Company
Interest income
Dividends from subsidiaries	6,100	6,731
Total interest income	6,128	7,499
Expenses
Interest	1,223	1,541
Salaries and employee benefits	284	1,097
Other	428	1,261
Total expenses	1,935	3,899
Income before income taxes	4,193	3,600
Income tax benefit	(218)	(639)
Income before equity in undistributed earnings of subsidiaries	4,411	4,239
Equity in undistributed earnings of subsidiaries	7,404	5,972
Net income	11,815	10,211
Parent Company | Management Service
Interest income
Non interest revenue from banking services	0	750
Parent Company | Financial Service, Other
Interest income
Non interest revenue from banking services	$ 28	$ 18