Financial Information of Colony Bankcorp, Inc. (Parent Only) - Statements of Cash Flows, Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 18,659	$ 11,815
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Stock-based compensation expense	599	33
Net cash provided by (used in) operating activities	36,104	(19,094)
CASH FLOWS FROM INVESTING ACTIVITIES
Net cash and cash equivalents paid in insurance acquisitions	(4,210)	0
Net cash used in investing activities	(208,332)	(130,266)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid on common stock	(4,463)	(3,800)
Net cash provided by financing activities	185,954	228,774
Net increase (decrease) in cash and cash equivalents	13,726	79,414
Cash and cash equivalents at beginning of period	183,506	104,092
Cash and cash equivalents at end of period	197,232	183,506
Parent Company
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	18,659	11,815
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	0	70
Stock-based compensation expense	599	33
Distribution in excess of earnings (equity in undistributed earnings) of subsidiaries	11,160	(7,404)
Change in interest payable	1	(51)
Other	(1,146)	(354)
Net cash provided by (used in) operating activities	29,273	4,109
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sales of premises and equipment	0	1,314
Net cash and cash equivalents paid in insurance acquisitions	(19,178)	0
Net cash used in investing activities	(19,178)	1,314
CASH FLOWS FROM FINANCING ACTIVITIES
Net decrease in other borrowed money	(1,000)	(1,000)
Dividends paid on common stock	(4,463)	(3,800)
Net cash provided by financing activities	(5,463)	(4,800)
Net increase (decrease) in cash and cash equivalents	4,632	623
Cash and cash equivalents at beginning of period	2,672	2,049
Cash and cash equivalents at end of period	$ 7,304	$ 2,672