Borrowings - Subordinated Debentures (Details) - Trust Preferred Securities Subject to Mandatory Redemption	12 Months Ended
	Dec. 31, 2021 USD ($)
Colony Bankcorp Statutory Trust III
Debt Instrument [Line Items]
Amount	$ 4,640,000
Colony Bankcorp Statutory Trust III | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	2.68%
Colony Bankcorp Capital Trust I
Debt Instrument [Line Items]
Amount	$ 5,155,000
Colony Bankcorp Capital Trust I | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Colony Bankcorp Capital Trust II
Debt Instrument [Line Items]
Amount	$ 9,279,000
Colony Bankcorp Capital Trust II | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
Colony Bankcorp Capital Trust III
Debt Instrument [Line Items]
Amount	$ 5,155,000
Colony Bankcorp Capital Trust III | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.40%