Fair Value Measurements - Plan's assets at fair value (Details) - Colony Bankcorp, Inc. 401(k) Plan - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Total assets in the fair value hierarchy
Fair Value Measurements
Investments at fair value	$ 34,319,085	$ 29,672,327
Total assets in the fair value hierarchy \| Interest-bearing money market account
Fair Value Measurements
Investments at fair value	396,861
Total assets in the fair value hierarchy \| Mutual fund
Fair Value Measurements
Investments at fair value	24,318,206	21,076,408
Total assets in the fair value hierarchy \| Common stock
Fair Value Measurements
Investments at fair value	9,604,018	8,520,604
Level 1
Fair Value Measurements
Investments at fair value	34,319,085	29,597,012
Level 1 \| Interest-bearing money market account
Fair Value Measurements
Investments at fair value	396,861
Level 1 \| Mutual fund
Fair Value Measurements
Investments at fair value	24,318,206	21,076,408
Level 1 \| Common stock
Fair Value Measurements
Investments at fair value	$ 9,604,018	8,520,604
Investments measured at NAV practical expedient (a) \| Pooled Separate Account
Fair Value Measurements
Investments at fair value		$ 75,315

Fair value of investment, excluding plan interest in master trust, held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant