Legal Entity [Axis] Statements of Net Assets Available for Benefits [Abstract] Investment Type [Axis] Total receivables Total assets Net assets available for benefits Beginning of year End of year Statements of Changes in Net Assets Available for Benefits [Abstract] Total contributions Total investment income Increase in net assets available for benefits Description of Plan [Abstract] Summary of Significant Accounting Policies [Abstract] Federal Income Tax Status [Abstract] Plan Termination [Abstract] Exempt Party-In-Interest and Related Party Transactions [Abstract] Fair Value of Plan Assets [Abstract] Fair Value Hierarchy and NAV [Axis] Schedule of Assets (Held at Year-End) [Abstract] Document Type Document Period End Date Document Fiscal Year Focus Entity Registrant Name Entity Central Index Key Amendment Flag Assets Cash Investments at fair value: Investments CTBI common stock (in Dollars) Fair Value Assets measured at fair value Receivables: Accrued interest and dividends Liabilities Excess contributions payable Contributions: Participants Employer Rollovers Investment income: Net appreciation in fair value of investments Interest and dividends Deductions: Net assets available for benefits: Benefits paid to participants Community Trust Bancorp, Inc. Savings Plan [Member] EBP 006 [Member] EBP006 [Member] Community Trust Bancorp, inc. Common Stock [Member] CTBI Common Stock [Member] Mutual Funds [Member] Mutual Fund [Member] Money Market Funds [Member] Description of Plan Summary of Significant Accounting Policies Federal Income Tax Status Plan Termination Exempt Party-In-Interest and Related Party Transactions Party-in-Interest Investments at Fair Value Shares outstanding (in Shares) Number of shares Fair Value of Plan Assets Statements of Net Assets Available for Benefits Measured at Fair Value Schedule of Assets (Held at Year-End) Identity of Issuer, Borrower, Lessor, or Similar Party Participant-Directed investments Status Current value Description of Investment Party-in-interest Total Investments Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Significant Other Observable Inputs (Level 2) [Member] Significant Unobservable Inputs (Level 3) [Member] Investment, Identifier [Axis] EBP, Contribution, Participating Employer [Axis] Measurement Frequency [Axis] Plan document description Minimum days of service required to be eligible to participate in plan through salary deferral Minimum age participants will be eligible to participate through salary deferral (in Age) Minimum age participants will be eligible to for employer match (in Age) Minimum number of consecutive months of employment to be eligible to participate in employer match Minimum hours of service required for an employee to be eligible for employer match (in Hour) Maximum amount of allowable deferral contributions Minimum age participants will be eligible to make catch-up contributions Catch-up contribution limit Company matching contribution percentage Participant’s compensation percentage eligible for matching Maximum company matching percentage for deferred compensation contributions of participants compensation Employer contribution vesting percentage Participant retirement age Minimum hours of employment to be eligible for payment of full value of plan account EBP, Vesting Service Number of Plan Years Minimum age for distribution payments for the Plan Distribution of funds equal annual installments period Forfeited nonvested account Adjusted excess contributions payable Percentage of Plan's net assets available for benefits invested in CTBI common stock IRS opinion letter received IRS opinion letter received, date Federal income tax status Dividend income Assets acquired net of income earned Assets disposed Liabilities measured at fair value Plan name EIN Plan # Basis of Accounting Valuation of Investments and Income Recognition Contributions Receivable Policy Use of Estimates and Risk and Uncertainties Administrative Expenses Payment of Benefits Subsequent Events Safe Harbor Matching 100 Percent [Member] Safe Harbor Matching 50 Percent [Member] Recurring [Member] Nonrecurring [Member] Investments [Domain] Entity [Domain] EBP, Statement of Net Asset Available for Benefit [Table] Statements of Net Assets Available for Benefits [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] Statements of Changes in Net Assets Available for Benefits [Abstract] EBP, Description of Plan [Table] Description of Plan [Abstract] EBP, Accounting Policy [Table] Summary of Significant Accounting Policies [Abstract] EBP, Tax Status [Table] Federal Income Tax Status [Abstract] EBP, Description of Plan Termination [Table] Plan Termination [Abstract] EBP, Related Party and Party-in-Interest Transactions [Table] Exempt Party-In-Interest and Related Party Transactions [Abstract] EBP, Investment, Fair Value and NAV [Table] Fair Value of Plan Assets [Abstract] EBP, Schedule of Asset Held for Investment [Table] Schedule of Assets (Held at Year-End) [Abstract] EBP, Accounting Policy [Line Items] Fair Value Hierarchy and NAV [Domain] EBP, Contribution, Participating Employer [Domain] Income Tax, Holiday [Table] Measurement Frequency [Domain] Employee Benefit Plan, matching contribution vesting percentage upon certain number of hours of employment conditions as defined by the employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee benefit plan distribution of funds equal annual installments period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Maximum company matching percentage for deferred compensation contributions of participants compensation in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Minimum age for distribution payments for the Plan. Minimum attained age required for employee to become eligible to participate in plan through salary deferral or for employer match (employee benefit plan (EBP)). Minimum days of service required to be eligible to participate in plan through salary deferral. Minimum Hours of Employment to be Eligible for Payment of Full Value of Plan Account (employee benefit plan (EBP)). Minimum number of hours of service required for an employee to become eligible for employer match in the plan. (employee benefit plan (EBP)). Employee benefit plan Minimum number of consecutive months of employment to be eligible to participate in employer match, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. The maximum extra money an employee is allowed to put into the plan each year as a catch-up contribution participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). The age at which participants become eligible for contributions under employee benefit plan. Minimum age to be eligible to participate in the plan in employee stock purchase, saving, or similar plan through salary deferral (employee benefit plan (EBP)). Age at which a participant attains normal retirement under the terms of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Disclosure of accounting policy for use of estimates and risk and uncertainties in preparation of financial statement of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee vesting service number of plan years (employee benefit plan (EBP)). Safe Harbor match of 100% on the first 3% of deferred salary. Safe Harbor match of 50% on the next 2% of deferred salary. Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Mutual Funds [Member] Participant-Directed Investments [Member] Community Trust Bancorp, Inc. - Common Stock [Member] Vanguard - Small Cap Growth Index Admiral [Member] MFS - Mid Cap Value R6 [Member] Vanguard - Target Retirement 2060 Fund [Member] Goldman Sachs - Short Duration Bond R6 [Member] Vanguard - Target Retirement 2025 Fund [Member] Vanguard - Target Retirement 2070 Fund [Member] Goldman Sachs - Financial Square Government Fund [Member] Vanguard - Target Retirement 2050 Fund [Member] Common Stock [Member] Money Market Funds [Member] American Funds - American Balanced R6 [Member] Dodge & Cox - Income Fund X [Member] Vanguard - Target Retirement 2045 Fund [Member] Vanguard - Target Retirement 2030 Fund [Member] Vanguard - Target Retirement 2035 Fund [Member] American Funds - New World R6 [Member] Vanguard - Growth Index Admiral [Member] Vanguard - Target Retirement Income Fund [Member] WCM - WCM Focused International Growth Instl [Member] Qualified Plan [Member] Vanguard - Target Retirement 2020 Fund [Member] Vanguard - Target Retirement 2040 Fund [Member] Nuveen - International Equity Index Fund R6 [Member] Federated - Hermes MDT Small Cap Core R6 [Member] Dodge & Cox - Stock Fund X [Member] Vanguard - Target Retirement 2055 Fund [Member] Vanguard - Mid-Cap Growth Index Admiral [Member] Fidelity - 500 Index Fund [Member] Vanguard - Target Retirement 2065 Fund [Member] EBP, Subsequent Event [Policy Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Employer, Common Stock [Member] EBP, Employer Contribution, Participant Compensation Matched, Percentage Fair Value, Inputs, Level 3 [Member] Employee Benefit Plan Participant Minimum Age Eligible To Make Catch Up Contributions EBP, Tax Qualification Status [Extensible Enumeration] EBP, Employer Contribution, Matching Percentage Employee Benefit Plan Participant Retirement Age EBP, Plan Number Employee Benefit Plan Participant Contribution Maximum Annual Catch Up Compensation Amount EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Employee Benefit Plan Vesting Service Number Of Plan Years Fair Value, Nonrecurring [Member] EBP, Noninterest-Bearing Cash EBP, Investment, Fair Value and NAV [Table Text Block] EBP, Related Party and Party-in-Interest Transactions [Text Block] Employee Benefit Plan Distribution Of Funds Equal Annual Installments Period Employee Benefit Plan Plan Termination Line Items EBP006 Member EBP, Forfeited Nonvested Account, Reallocated to Participant EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Net Assets, Percentage EBP, Description, Available [true false] Employee Benefit Plan Minimum Age For Distribution Payments For The Plan EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Expense [Policy Text Block] EBP, Related Party and Party-in-Interest Transactions [Line Items] Safe Harbor Matching50 Percent Member Employee Benefit Plan Use Of Estimates And Risk And Uncertainties Policy Text Block Fair Value, Inputs, Level 1 [Member] EBP, Summary of Accounting Policy [Text Block] EBP, Asset Held for Investment, Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Tax Status [Text Block] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] EBP, Receivable EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Safe Harbor Matching100 Percent Member EBP, Change in Net Asset Available for Benefit, Increase from Contribution Employee Benefit Plan Minimum Days Of Service Required To Be Eligible To Participate In Plan Through Salary Deferral EBP, Related Party and Party-in-Interest Transactions [Table Text Block] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Asset [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Employee Benefit Plan Minimum Minimum Number Of Consecutive Months Of Employment To Be Eligible To Participate In Employer Match Employee Benefit Plan Minimum Hours Of Employment To Be Eligible For Payment Of Full Value Of Plan Account EBP, Asset EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Cost EBP, Investment, Fair Value [Abstract] EBP, Description of Plan [Text Block] Document Fiscal Year Focus Employee Benefit Plan Minimum Hours Of Service Required To Be Eligible For Employer Match EBP, Tax Determination Letter, Date EBP, Investment Income, Receivable EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Employee Benefit Plan Contribution Vesting Percentage EBP, Forfeited Nonvested Account EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Plan Termination [Text Block] EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] EBP, Investment, Number of Shares EBP, Description of Plan [Line Items] EBP, Asset Held for Investment, Party-in-Interest [true false] Fair Value, Recurring [Member] EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash EBP, Excess Contribution Payable Fair Value, Inputs, Level 2 [Member] EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price Employee Benefit Plan Maximum Company Matching Percentage For Deferred Compensation Contributions Of Participants Compensation EBP, Basis of Accounting [Policy Text Block] EBP, Investment, Fair Value and NAV [Line Items] EBP, Liability [Abstract] EBP, Asset Held for Investment EBP, Receivable [Abstract] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Net Asset Available for Benefit EBP, Investment [Policy Text Block] EBP, Schedule of Asset Held for Investment [Line Items] Document Type Employee Benefit Plan Minimum Attained Age Required For An Employee To Become Eligible To Participate In The Plan Through Salary Deferral Or For Employer Match EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Entity Tax Identification Number EBP, Contribution [Policy Text Block] Amendment Flag EBP, Tax Status [Line Items] Document Period End Date Employee Benefit Plan Participant Minimum Age To Be Eligible To Participate In Plan Through Salary Deferral EBP, Investment, Fair Value and NAV [Text Block] EBP, Schedule of Asset Held for Investment [Table Text Block] EBP, Investment Liability, Fair Value Entity Central Index Key EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Participant Contribution, Pretax, Maximum Annual Compensation, Amount Investment, Identifier [Axis] EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover EBP, Plan Name EBP, Payment to Participant [Policy Text Block] Entity Registrant Name EBP, Change in Net Asset Available for Benefit, Increase (Decrease) EBP, Tax Determination Letter, Obtained [true false]