Document and Entity Information [Abstract] Document Information [Table] Legal Entity [Axis] Entity [Domain] Represents the Retirement Plan Number 002. E B P 002 [Member] Colony Bankcorp, Inc. 401(k) Plan Document Information [Line Items] Document Type Entity Registrant Name Entity Central Index Key Amendment Flag STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Asset [Abstract] Assets Fair value of investment in interest bearing money market account, 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. Employee Benefit Plan, Interest Bearing Money Market Account, Fair Value Interest-bearing money market account Fair value of investment, excluding interest bearing money market account and 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. Employee Benefit Plan, Investment, Excluding Interest Bearing Money Market Account And Plan Interest In Master Trust Fair Value Investments at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Investment at contract value Investment value EBP, Investment, Excluding Plan Interest in Master Trust, Fair and Contract Value Total investments fair and contract value EBP, Receivable [Abstract] Receivables EBP, Employer Contribution, Receivable Employer's contribution EBP, Participant Contribution, Receivable Participants' contributions EBP, Note Receivable from Participant Notes receivable from participants EBP, Receivable Receivables EBP, Asset Total assets EBP, Net Asset Available for Benefit Net assets available for benefits, End of year Net assets available for benefits, Beginning of year Net Assets Available for Benefits STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Interest and dividends EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Total investment income EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash Employer EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participants EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Rollovers EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total Contributions EBP, Change in Net Asset Available for Benefit, Increase Total additions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants Amount of decrease in net asset available for benefit from deemed distributions of loans in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), including, but not limited to, withdrawal. EBP, Change in Net Asset Available for Benefit, Decrease from Deemed Distributions of Loans Deemed distributions of loans EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease Total deductions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase Description of Plan EBP, Description of Plan [Table] EBP, Description of Plan [Line Items] Plan Termination Description of Plan EBP, Description of Plan [Text Block] Description of Plan Summary of Significant Accounting Policies EBP, Accounting Policy [Table] EBP, Accounting Policy [Line Items] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Summary of Significant Accounting Policies Group Annuity Contract EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Line Items] Group Annuity Contract EBP, Fully Benefit-Responsive Investment Contract [Text Block] Group Annuity Contract Fair Value Measurements EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Line Items] Fair Value Measurements EBP, Investment, Fair Value and NAV [Text Block] Fair Value Measurements Income Tax Status EBP, Tax Status [Table] EBP, Tax Status [Line Items] Income Tax Status EBP, Tax Status [Text Block] Income Tax Status Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Line Items] Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] Party-in-Interest Transactions No definition available. Excess Participant Contributions Payable EBP, Contribution [Table] EBP, Contribution [Line Items] Excess Participant Contributions Payable The entire disclosure for excess participant contributions payable to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan , Excess Participant Contributions Payable [Text Block] Excess Participant Contributions Payable No definition available. Plan Termination EBP, Plan Termination [Text Block] Plan Termination Risks and Uncertainties EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Line Items] Risks and Uncertainties EBP, Risk and Uncertainty [Text Block] Risks and Uncertainties SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Line Items] SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Basis of Accounting [Policy Text Block] Basis of Accounting EBP, Use of Estimate [Policy Text Block] Use of Estimates EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition EBP, Contribution [Policy Text Block] Contributions Income EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants EBP, Payment to Participant [Policy Text Block] Payment of Benefits EBP, Expense [Policy Text Block] Administrative Expenses EBP, Subsequent Event [Policy Text Block] Events Occurring After Reporting Date EBP, Investment, Fair Value and NAV [Table Text Block] Schedule of investments at fair value Tabular disclosure of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), that is measured at net asset value (NAV) per share as practical expedient for estimate of fair value. Employee Benefit Plan, Fair Value, Investment, NAV [Table Text Block] Summary of investments measured using the NAV practical expedient Scenario [Axis] Scenario [Domain] Represents the first portion of salary deductions. First Portion of Salary Deductions [Member] First portion of salary deductions Represents the second portion of salary deductions. Second Portion of Salary Deductions [Member] Second portion of salary deductions Statistical Measurement [Axis] Statistical Measurement [Domain] Maximum [Member] Maximum EBP, Description, Available [true false] Description of plan Represents the minimum service period for eligibility of elective employee deferred contribution under (employee benefit plan (EBP)). Employee Benefit Plan, Elective Employee Deferred Contributions, Minimum Service Period Minimum service period for elective employee deferred contributions EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee contribution EBP, Participant Contribution, Automatic, Deferral Rate Deferral rate Percentage of increase of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Participant Contribution, Automatic, Increase In Deferral Rate Increase in deferral rate Maximum percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Participant Contribution, Automatic, Maximum Deferral Rate Maximum deferral rate Represents the minimum age criteria for the eligibility of employer matching contribution under (employee benefit plan (EBP)). Employee Benefit Plan, Employer Matching Contribution, Minimum Age Minimum age for employer matching contribution Represents the minimum service period of participant for the eligibility of employer matching contribution under (employee benefit plan (EBP)). Employee Benefit Plan, Employer Matching Contribution, Minimum Service Period Minimum service period for employer matching contribution Represents the minimum age criteria for the eligibility of for non-elective plan contribution under (employee benefit plan (EBP)). Employee Benefit Plan, Non Elective Contribution, Minimum Age Minimum age for non-elective contribution Represents the minimum service period for the eligibility of for non-elective plan contribution under (employee benefit plan (EBP)). Employee Benefit Plan, Non Elective Contribution, Minimum Service Period Minimum service period for non-elective contribution Represents the minimum service hours for the eligibility of for non-elective plan contribution under (employee benefit plan (EBP)). Employee Benefit Plan, Non Elective Contribution, Minimum Hours Of Service Minimum service hours for non-elective contribution Amount of discretionary contributions made by an employer to a defined contribution plan. Employee Benefit Plan, Employer Non Elective Contribution, Amount Discretionary non-elective contributions EBP, Employer Contribution, Matching Percentage Employer matching contribution (as a percent) EBP, Employer Contribution, Participant Compensation Matched, Percentage Participant compensation matched (as a percent) Employer matching contribution as a percentage of participant compensation under (employee benefit plan (EBP)). Employee Benefit Plan, Employer Matching Contribution, Percentage On Participant Contribution Employer matching contribution on participant contribution (as a percent) Represents information pertaining to vesting pertaining to two years of service. Employee Benefit Plan, After Two Years Of Service [Member] After two years of service Represents information pertaining to vesting pertaining to three years of service. Employee Benefit Plan, After Three Years Of Service [Member] After three years of service Represents information pertaining to vesting pertaining to four years of service. Employee Benefit Plan, After Four Years Of Service [Member] After four years of service Represents information pertaining to vesting pertaining to five years of service. Employee Benefit Plan, After Five Years Of Service [Member] After five years of service Represents information pertaining to vesting pertaining to six years of service. Employee Benefit Plan, After Six Years Of Service [Member] After six years of service Represents the percentage of vesting at the time of death, attainment of normal retirement age, disability. Employee Benefit Plan, Vesting Percentage Vesting percentage EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Minimum loans EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Maximum loans EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Percentage of maximum vested accounted balances for loans The maximum term of participant loan of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Note Receivable From Participant, Maximum Term Loan term Represents the percentage points added to the prime rate to compute the interest rate on participant loans under (employee benefit plan (EBP)). Employee Benefit Plan, Note Receivable From Participant, Basis Spread On Prime Rate Basis spread on prime rate (as a percent) Threshold age that participant must attain for withdrawals in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Participant Withdrawals, Threshold Age Threshold age for withdrawal EBP, Forfeited Nonvested Account Forfeited nonvested accounts EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Amount of contributions reduced for forfeited nonvested accounts EBP, Forfeited Nonvested Account, Decrease from Administrative Expense Amount of reduction from administration expense for forfeited nonvested accounts Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Fixed annuity plan in which employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participates. Employee Benefit Plan Fixed Annuity [Member] Guaranteed fixed annuity account Number of accounts under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) participates. Investment Options, Number of Accounts Offered By Plan Number of account offered Amount of allowance for credit loss on contribution in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Contributions, Allowance for Credit Loss Contribution income - allowance for credit losses EBP, Note Receivable from Participant, Allowance for Credit Loss Notes receivable from participants - allowance for credit losses The minimum crediting rate pursuant to fully benefit-responsive investment contract with employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) and settle at amount different from contract value. Employee Benefit Plan, Fully Benefit Responsive Investment Contract, Minimum Crediting Rate Minimum crediting rate The market value adjustments or surrender charge adjustments pursuant to fully benefit-responsive investment contract with employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) and settle at amount different from contract value. Employee Benefit Plan, Fully Benefit Responsive Investment Contract, Market Value Adjustments Or Surrender Charge Adjustments Market value adjustments or surrender charge adjustments The holding period for equity wash pursuant to fully benefit-responsive investment contract with employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) and settle at amount different from contract value. Employee Benefit Plan, Fully Benefit Responsive Investment Contract, Holding Period For Equity Wash Holding period for equity wash The reserves against contract value for credit risk pursuant to fully benefit-responsive investment contract with employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) and settle at amount different from contract value. Employee Benefit Plan, Fully Benefit Responsive Investment Contract, Credit Risk Reserve Credit risk reserve Amount represents any additional obligation pursuant to fully benefit-responsive investment contract with employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) and settle at amount different from contract value. Employee Benefit Plan, Fully Benefit Responsive Investment Contract, Unfunded Commitments Unfunded commitments Percentage of surrender charge pursuant to fully benefit-responsive investment contract with employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) and settle at amount different from contract value. Employee Benefit Plan, Fully Benefit Responsive Investment Contract, Surrender Charge Surrender charge Excess percentage of withdrawal on which surrender charge is levied pursuant to fully benefit-responsive investment contract with employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) and settle at amount different from contract value. Employee Benefit Plan, Surrender Charge, Excess Percentage on Accumulated Withdrawal Excess percentage of withdrawal, surrender charge levied EBP, Fair Value, Investment, NAV, Unfunded Commitment Unfunded commitments Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Total assets in the fair value hierarchy Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value Measured at Net Asset Value Per Share [Member] Investments measured at NAV practical expedient (a) Money Market Funds [Member] Interest-bearing money market account Mutual Fund [Member] Mutual fund EBP, Pooled Separate Account [Member] Pooled Separate Account Real estate securities separate account EBP, Employer, Common Stock Fund [Member] Common stock EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Investments at fair value Fair Value EBP, Fair Value, Investment, NAV, Redemption, Notice Period Redemption Notice Period EBP, Tax Determination Letter, Obtained [true false] Determination letter obtained EBP, Tax Qualification Status [Extensible Enumeration] Tax qualification status EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Domain] Employer of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Employer [Member] Company EBP, Employer, Common Stock [Member] Colony Bankcorp, Inc. common stock Minimum [Member] Minimum EBP, Investment, Number of Shares Investment, Number of shares EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Cash Dividends EBP, Asset Held for Investment, Participant Loan, Interest Rate Interest rates for participants loans EBP, Excess Contribution Payable Excess contributions Represents the percentage of vesting of participant accounts in the event of termination. Employee Benefit Plan, Vesting Percentage in Event of Termination Vesting percentage Investment, Identifier [Axis] Entity Tax Identification Number Entity tax identification number EBP, Plan Number Plan number EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current value EBP, Asset Held for Investment, Participant Loan, Maturity Date Maturity date for participant loans EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Participants loans EBP, Asset Held for Investment Total assets