BORROWINGS - Narrative (Details) - USD ($)		3 Months Ended				12 Months Ended
	May 20, 2022	Sep. 30, 2007	Mar. 31, 2007	Jun. 30, 2006	Jun. 30, 2004	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Lendable collateral value of loans pledged						$ 235,200,000	$ 150,000,000
Remaining credit availability						596,200,000	574,900,000
Available federal funds lines of credit						64,500,000	64,500,000
Federal funds lines of credit outstanding						0	0
Total borrowings						238,445,000	$ 203,352,000
Colony Bankcorp Statutory Trust III | Trust Preferred Securities Subject to Mandatory Redemption
Debt Instrument [Line Items]
Amount						4,640,000
Proceeds from issuance of trust preferred securities					$ 4,500,000
Trust preferred securities, term					30 years
Trust preferred securities, redemption restriction period					5 years
Colony Bankcorp Capital Trust I | Trust Preferred Securities Subject to Mandatory Redemption
Debt Instrument [Line Items]
Amount						5,155,000
Proceeds from issuance of trust preferred securities				$ 5,000,000
Trust preferred securities, term				30 years
Trust preferred securities, redemption restriction period				5 years
Colony Bankcorp Capital Trust II | Trust Preferred Securities Subject to Mandatory Redemption
Debt Instrument [Line Items]
Amount						9,279,000
Proceeds from issuance of trust preferred securities			$ 9,000,000
Trust preferred securities, term			30 years
Trust preferred securities, redemption restriction period			5 years
Colony Bankcorp Capital Trust III | Trust Preferred Securities Subject to Mandatory Redemption
Debt Instrument [Line Items]
Amount						$ 5,155,000
Proceeds from issuance of trust preferred securities		$ 5,000,000
Trust preferred securities, term		30 years
Trust preferred securities, redemption restriction period		5 years
Subordinated Debt
Debt Instrument [Line Items]
Amount	$ 40,000,000
Long-term debt	5.25%					5.25%	5.25%
Total borrowings						$ 39,200,000
Subordinated Debt, Fixed Rate
Debt Instrument [Line Items]
Debt instrument term	5 years
Subordinated Debt, Variable Rate
Debt Instrument [Line Items]
Debt instrument term	5 years
Secured Overnight Financing Rate (SOFR) | Subordinated Debt
Debt Instrument [Line Items]
Subordinated debentures	2.65%
Federal Reserve Bank Advances
Debt Instrument [Line Items]
Available borrowing capacity under FRB						$ 0	$ 0
FRB Term Funding Program
Debt Instrument [Line Items]
Debt instrument term						1 year
FRB Term Funding Program | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 100,000,000