Legal Entity [Axis] Statements of Net Assets Available for Benefits [Abstract] Investment Type [Axis] Total receivables Net assets available for benefits Beginning of year End of year Statements of Changes in Net Assets Available for Benefits [Abstract] Total investment income Increase in net assets available for benefits Net increase Description of Plan [Abstract] Summary of Significant Accounting Policies [Abstract] Net Assets by Participant and Non-Participant Directed Investments [Abstract] Total additions Total deductions EBP, Participant-Directed and Nonparticipant-Directed Status [Axis] 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] Schedule of Reportable Transactions [Abstract] Document Type Document Period End Date Document Fiscal Year Focus Entity Registrant Name Entity Central Index Key Amendment Flag Cash Investments at fair value: Investments CTBI common stock (in Dollars) Fair Value Assets measured at fair value Receivables: Accrued interest and dividends Contributions Investment income: Investment income (loss): Net appreciation in fair value of investments Net appreciation (depreciation) in fair value of investments Interest and dividends Deductions: Net assets available for benefits: Benefits paid to participants Benefits paid to participants Community Trust Bancorp, Inc. Employee Stock Ownership Plan [Member] Community Trust Bancorp, Inc. Employee Stock Ownership Plan [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 Net Assets by Participant and Non-Participant Directed Investments Changes in Net Assets Relating to the Participant and Non-Participant Directed Investments Transfers from non-participant directed funds to participant directed funds 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 (in 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 Identity of Party Involved Current Value Description of Investment Description of Asset Participant-Directed Investments Status Party-in-interest Cost Total Investments Schedule of Reportable Transactions Purchase Price Cost of Asset Number of acquired Selling Price Assets disposed Realized Gain Number of shares sold Transfers from non-participant directed funds to participant directed funds Participant-Directed Investments [Member] Non-Participant Directed Employer Fund [Member] 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] Statistical Measurement [Axis] Measurement Frequency [Axis] Plan document description Minimum age to be eligible to participate in the Plan (in Age) Minimum completed consecutive period of employment to be eligible to participate in the Plan Minimum hours required per year to be eligible to participate in Plan. (in Hours) Contribution percentage Minimum age required to allocate a portion of Plan balance to other investments (in Age) Minimum service period required to allocate a portion of Plan balance to other investments Maximum period to allocate a portion of plan balance to other investments after close of plan year Consecutive periods to allocate a portion of plan balance to other investments Vesting percentage in normal retirement, death or total disability Normal retirement age (in Age) Minimum hours required for full vested benefit payment upon termination (in Hours) Employee Benefit Plan Employer Contribution Vesting Period Distribution of funds equal annual installments period Minimum amount of vested interest where distribution period may be extended Extension period when vested interest amount is exceeded Incremental amount of vested interest where distribution period may be extended Forfeited nonvested accounts Forfeitures of terminated nonvested account balances allocated to remaining participant 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 Liabilities measured at fair value Plan name EIN Plan # Basis of Accounting Valuation of Investments and Income Recognition Use of Estimates and Risk and Uncertainties Administrative Expenses Payment of Benefits Subsequent Events Maximum [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, Accounting Standard Update and Change in Accounting Principle [Table] Description of Plan [Abstract] EBP, Accounting Policy [Table] Summary of Significant Accounting Policies [Abstract] EBP, Participant and Nonparticipant-Directed Investment [Table] Net Assets by Participant and Non-Participant Directed Investments [Abstract] EBP, Tax Status [Table] Federal Income Tax Status [Abstract] EBP, Description of Plan [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, Schedule of Reportable Transactions [Table] Schedule of Reportable Transactions [Abstract] EBP, Accounting Policy [Line Items] Employee Benefit Plan Participant and Non participant Directed Investment [Table] EBP, Participant-Directed and Nonparticipant-Directed Status [Domain] EBP, Participant and Non-Participant Directed Investments [Table] Fair Value Hierarchy and NAV [Domain] Statistical Measurement [Domain] Measurement Frequency [Domain] Amount of decrease in net asset available for benefit from transferred out of non-participant-directed employer funds to participant-directed funds during the period. Amount of increase in net asset available for benefit from transferred internally within the plan from non-participant-directed employer funds to participant-directed funds during the reporting period. Employee benefit plan consecutive period for allocation elections, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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. Employee Benefit Plan, Sponsor's matching contribution vesting percentage upon certain number of years of employment conditions as defined by the employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employer contribution vesting period, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Employee benefit plan extension period when vested interest amount is exceeded, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Incremental amount of vested interest where distribution period may be extended in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee benefit plan, maximum period to allocate a portion of plan balance to other investments after close of plan year, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Minimum age required to allocate a portion of plan balance to other investments in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Minimum age to be eligible to participate in the plan in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Minimum amount of vested interest where distribution period may be extended in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee benefit plan minimum completed consecutive period of employment to be eligible to participate in plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Minimum number of hours an employee is generally required to work for full benefit payment on vested balance upon termination in the employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Minimum number of hours an employee is generally required to work per year in order to become eligible to participate in the employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee benefit plan minimum service period required to allocate a portion of plan balance to other investments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Disclosure of information about participant and nonparticipant-directed investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). The entire disclosure for participant and nonparticipant-directed investment held by employee stock purchase, saving, or similar plan (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)). 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. Disclosure of information about participant and nonparticipant-directed investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Mutual Funds [Member] Participant-Directed Investments [Member] Qualified Plan [Member] Goldman Sachs - Short Duration Bond R6 [Member] Vanguard - Mid-Cap Growth Index Admiral [Member] Community Trust Bancorp, Inc. - Common Stock [Member] Vanguard - Target Retirement 2050 Fund [Member] Community Trust Bancorp, Inc. [Member] Common Stock [Member] Vanguard - Small Cap Growth Index Admiral [Member] MFS - Mid Cap Value R6 [Member] Vanguard - Target Retirement 2035 Fund [Member] Vanguard - Growth Index Admiral [Member] Dodge & Cox - Income Fund [Member] Dodge & Cox - Stock Fund [Member] Vanguard - Target Retirement 2025 Fund [Member] American Funds - New World R6 [Member] Goldman Sachs - Financial Square Government Fund [Member] Vanguard - Target Retirement 2020 Fund [Member] Nuveen - International Equity Index Fund R6 [Member] Federated - Hermes MDT Small Cap Core R6 [Member] WCM - WCM Focused International Growth Instl [Member] Fidelity - 500 Index Fund [Member] American Funds - American Balanced R6 [Member] Money Market Funds [Member] Vanguard - Target Retirement 2030 Fund [Member] EBP, Subsequent Event [Policy Text Block] EBP, Investment Acquired, Excluding Plan Interest in Master Trust, Purchase Price Employee Benefit Plan Minimum Service Period Required To Allocate APortion Of Plan Balance To Other Investments EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Employer, Common Stock [Member] EBP, Participant Contribution, Automatic, Deferral Rate Fair Value, Inputs, Level 3 [Member] EBP, Tax Qualification Status [Extensible Enumeration] Employee Benefit Plan Participant Retirement Age EBP, Plan Number EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Employee Benefit Plan Employer Contribution Vesting Percentage EBP, Investment, Sold, Number of Investments 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 Maximum Period To Allocate APortion Of Plan Balance To Other Investments After Close Of Plan Year EBP, Investment Sold, Excluding Plan Interest in Master Trust, Cost Employee Benefit Plan Distribution Of Funds Equal Annual Installments Period EBP, Forfeited Nonvested Account, Reallocated to Participant EBP, Risk and Uncertainty, Concentration of Investment at Fair Value to Net Assets, Percentage Employee Benefit Plan Minimum Amount Of Vested Interest Where Distribution Period May Be Extended EBP, Description, Available [true false] 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] Employee Benefit Plan Use Of Estimates And Risk And Uncertainties Policy Text Block Fair Value, Inputs, Level 1 [Member] EBP, Change in Net Asset Available for Benefit, Increase EBP, Summary of Accounting Policy [Text Block] Employee Benefit Plan Change In Net Asset Available For Benefit Increase For Transfers From Nonparticipant Directed Funds To Participant Directed Funds 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, Decrease from Payment to Participant Employee Benefit Plan Minimum Hours Required For Full Benefit Payment On Vested Balance Upon Termination Employee Benefit Plan Change In Net Asset Available For Benefit Decrease For Transfers From Nonparticipant Directed Funds To Participant Directed Funds EBP, Change in Net Asset Available for Benefit, Increase from Contribution Employee Benefit Plan Minimum Age Required To Allocate APortion Of Plan Balance To Other Investments Employee Benefit Plan Minimum Age To Be Eligible To Participate In Plan Employee Benefit Plan Extension Period When Vested Interest Amount Is Exceeded EBP, Related Party and Party-in-Interest Transactions [Table Text Block] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment EBP, Fair Value, Investment, NAV [Abstract] EBP, Investment, Excluding Plan Interest in Master Trust, Cost 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 Employer Contribution Vesting Period EBP, Tax Determination Letter, Date EBP, Investment Income, Receivable EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment EBP007 Member EBP, Nonparticipant-Directed [Member] EBP, Forfeited Nonvested Account EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Plan Termination [Text Block] EBP, Investment, Number of Shares EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Description of Plan [Line Items] EBP, Asset Held for Investment, Party-in-Interest [true false] Fair Value, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Employee Benefit Plan Minimum Completed Consecutive Period Of Employment To Be Eligible To Participate In Plan EBP, Investment, Acquired, Number of Investment Employee Benefit Plan Consecutive Period For Allocation Elections EBP, Investment Sold, Excluding Plan Interest in Master Trust, Selling Price EBP, Change in Net Asset Available for Benefit, Decrease Employee Benefit Plan Incremental Amount Of Vested Interest Where Distribution Period May Be Extended EBP, Basis of Accounting [Policy Text Block] EBP, Investment, Fair Value and NAV [Line Items] EBP, Asset Held for Investment EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Realized Gain (Loss) on 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] Employee Benefit Plan Participant And Non Participant Directed Investment Table Text Block EBP, Schedule of Reportable Transaction [Table Text Block] Maximum [Member] EBP, Schedule of Asset Held for Investment [Line Items] Document Type EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Entity Tax Identification Number Employee Benefit Plan Participant And Non Participant Directed Investment Line Items Amendment Flag EBP, Tax Status [Line Items] Document Period End Date EBP, Investment, Fair Value and NAV [Text Block] EBP, Schedule of Asset Held for Investment [Table Text Block] EBP, Investment Liability, Fair Value Employee Benefit Plan Minimum Hours Required Per Year To Be Eligible To Participate In Plan Entity Central Index Key EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value EBP, Schedule of Reportable Transaction [Line Items] Investment, Identifier [Axis] Employee Benefit Plan Participant And Non Participant Directed Investment Text Block EBP, Change in Net Asset Available for Benefit, Increase (Decrease) [Abstract] 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]