Financial Information of Colony Bankcorp, Inc. (Parent Only) - Balance Sheets, Parent Company (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Premises and equipment	$ 32,057	$ 32,482
Other	13,589	11,105
Total assets	1,763,974	1,515,313
Liabilities
Other	7,378	5,273
Subordinated debt	24,229	24,229
Total liabilities	1,619,486	1,384,807
Stockholders’ equity
Common stock, par value $1.00; 20,000,000 shares authorized,9,498,783 shares issued and outstanding as of December 31, 2020 and 2019, respectively	9,499	9,499
Paid-in capital	43,215	43,667
Retained earnings	84,993	76,978
Accumulated other comprehensive income, net of tax	6,781	362
Total stockholders’ equity	144,488	130,506	$ 95,692
Total liabilities and stockholders’ equity	1,763,974	1,515,313
Parent Company
Assets
Cash	2,672	2,049
Premises and equipment	0	1,171
Investment in subsidiaries	179,172	165,836
Other	570	483
Total assets	182,414	169,539
Liabilities
Other borrowed money	13,563	14,563
Other	134	241
Subordinated debt	24,229	24,229
Total liabilities	37,926	39,033
Stockholders’ equity
Common stock, par value $1.00; 20,000,000 shares authorized,9,498,783 shares issued and outstanding as of December 31, 2020 and 2019, respectively	9,499	9,499
Paid-in capital	43,215	43,667
Retained earnings	84,993	76,978
Accumulated other comprehensive income, net of tax	6,781	362
Total stockholders’ equity	144,488	130,506
Total liabilities and stockholders’ equity	$ 182,414	$ 169,539