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Regulatory Matters (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
--- | --- | ---
CBLR, Amount [Abstract] |  |
Actual Amount | $ 750,159 | $ 696,828
For Capital Adequacy Purposes | $ 498,148 | $ 455,594
CBLR, Ratio [Abstract] |  |
Actual Ratio | 0.1355 | 0.13
For Capital Adequacy Purposes | 0.09 | 0.085
Community Trust Bank, Inc [Member] |  |
Regulatory Matter [Abstract] |  |
Maximum dividend without Approval | $ 111,500 |
CBLR, Amount [Abstract] |  |
Actual Amount | 714,727 | $ 662,125
For Capital Adequacy Purposes | $ 495,727 | $ 453,185
CBLR, Ratio [Abstract] |  |
Actual Ratio | 0.1298 | 0.1242
For Capital Adequacy Purposes | 0.09 | 0.085

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- Definition Amount of community bank leverage ratio as defined by regulatory framework. + References No definition available. + Details
Name: | ctbi_BankingRegulationCommunityBankLeverageRatioActual
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount of minimum community bank leverage ratio required for capital adequacy as defined by regulatory framework. + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Ratio of minimum community bank leverage ratio to average assets required for capital adequacy as defined by regulatory framework. + References No definition available. + Details
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Namespace Prefix: | ctbi_
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- Definition Ratio of community bank leverage ratio to average assets as defined by regulatory framework. + References No definition available. + Details
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Namespace Prefix: | ctbi_
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- References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | ctbi_CommunityBankLeverageRatioFrameworkRatioAbstract
Namespace Prefix: | ctbi_
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- References No definition available. + Details
Name: | ctbi_RegulatoryMatterAbstract
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- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |