Financial Information of Colony Bankcorp, Inc. (Parent Only) - Statements of Operations, Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Interest income
Total interest income	$ 70,586	$ 63,125
Expenses
Salaries and employee benefits	45,596	34,141
Income tax benefit	4,495	2,815
Net income	18,659	11,815
Parent Company
Interest income
Dividends from subsidiaries	31,060	6,100
Total interest income	31,075	6,128
Expenses
Interest	1,012	1,223
Salaries and employee benefits	371	284
Other	604	428
Total expenses	1,987	1,935
Income before income taxes	29,088	4,193
Income tax benefit	(731)	(218)
Income before equity in undistributed earnings (distributions in excess of earnings) of subsidiaries	29,819	4,411
Equity in undistributed earnings(distributions in excess of earnings) of subsidiaries	(11,160)	7,404
Net income	18,659	11,815
Parent Company | Financial Service, Other
Interest income
Other	$ 15	$ 28