Financial Information of Colony Bankcorp, Inc. (Parent Only) - Balance Sheets, Parent Company (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Other	$ 16,678	$ 13,589
Total assets	2,691,715	1,763,974
Liabilities
Other	10,952	7,378
Subordinated debt	24,229	24,229
Total liabilities	2,474,008	1,619,486
Stockholders’ equity
Common stock, par value $1.00; 20,000,000 shares authorized, 13,673,898 and 9,498,783 shares issued and outstanding as of December 31, 2021 and 2020, respectively	13,674	9,499
Paid-in capital	111,021	43,215
Retained earnings	99,189	84,993
Accumulated other comprehensive (loss) income, net of tax	(6,177)	6,781
Total stockholders’ equity	217,707	144,488	$ 130,506
Total liabilities and stockholders’ equity	2,691,715	1,763,974
Parent Company
Assets
Cash	7,304	2,672
Investment in subsidiaries	245,614	179,172
Other	1,689	570
Total assets	254,607	182,414
Liabilities
Other borrowed money	12,563	13,563
Other	108	134
Subordinated debt	24,229	24,229
Total liabilities	36,900	37,926
Stockholders’ equity
Common stock, par value $1.00; 20,000,000 shares authorized, 13,673,898 and 9,498,783 shares issued and outstanding as of December 31, 2021 and 2020, respectively	13,674	9,499
Paid-in capital	111,021	43,215
Retained earnings	99,189	84,993
Accumulated other comprehensive (loss) income, net of tax	(6,177)	6,781
Total stockholders’ equity	217,707	144,488
Total liabilities and stockholders’ equity	$ 254,607	$ 182,414