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Regulatory Matters (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 Document | Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Restricted core capital elements (in hundredths) | 25.00%ctbi_RestrictedCoreCapitalElements |
Transition period of final rule | 5 years |
Tier I capital (to average assets), Amount [Abstract] |  |
Actual Amount | $ 439,877,000 us-gaap_TierOneLeverageCapital | $ 412,053,000 us-gaap_TierOneLeverageCapital
For Capital Adequacy Purposes | 146,139,000 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy | 143,198,000 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Tier I capital (to average assets), Ratio [Abstract] |  |
Actual Ratio (in hundredths) | 12.04%us-gaap_TierOneLeverageCapitalToAverageAssets | 11.51%us-gaap_TierOneLeverageCapitalToAverageAssets
For Capital Adequacy Purposes (in hundredths) | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Tier I capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | 439,877,000 us-gaap_TierOneRiskBasedCapital | 412,053,000 us-gaap_TierOneRiskBasedCapital
For Capital Adequacy Purposes | 106,572,000 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy | 102,056,000 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio (in hundredths) | 16.51%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets | 16.15%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
For Capital Adequacy Purposes (in hundredths) | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Total capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | 473,097,000 us-gaap_Capital | 443,875,000 us-gaap_Capital
For Capital Adequacy Purposes | 213,107,000 us-gaap_CapitalRequiredForCapitalAdequacy | 204,080,000 us-gaap_CapitalRequiredForCapitalAdequacy
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
Actual Ratio (in hundredths) | 17.76%us-gaap_CapitalToRiskWeightedAssets | 17.40%us-gaap_CapitalToRiskWeightedAssets
For Capital Adequacy Purposes (in hundredths) | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Number of consultative documents released by the Basel Committee | 2 ctbi_NumberOfConsultativeDocumentsReleasedByBaselCommittee |
Maximum countercyclical buffer specified as percentage of common equity Tier 1 capital (in hundredths) | 2.50%ctbi_MaximumCountercyclicalBufferSpecifiedAsPercentageOfCommonEquityTier1Capital |
Assets threshold for advanced approach banks | 250,000,000,000 ctbi_AssetsThresholdForAdvancedApproachBanks |
Foreign exposures threshold for advanced approach banks | 10,000,000,000 ctbi_ForeignExposuresThresholdForAdvancedApproachBanks |
Total assets threshold for small depository institution | 15,000,000,000 ctbi_TotalAssetsThresholdForSmallDepositoryInstitution |
Minimum assets for top tier banking organizations for disclosure requirements | 50,000,000,000 ctbi_MinimumAssetsForTopTierBankingOrganizationsForDisclosureRequirements |
Minimum consolidated assets for banks to which top tier banking organizations apply | 250,000,000,000 ctbi_MinimumConsolidatedAssetsForBanksToWhichTopTierBankingOrganizationsApply |
Community Trust Bank, Inc [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Maximum dividend without Approval | 53,200,000 ctbi_MaximumDividendWithoutApproval / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |
Tier I capital (to average assets), Amount [Abstract] |  |
Actual Amount | 416,861,000 us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 392,932,000 us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
For Capital Adequacy Purposes | 145,374,000 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 142,496,000 us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
To Be Well-Capitalized Under Prompt Corrective Action Provision | 181,718,000 us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 178,120,000 us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Tier I capital (to average assets), Ratio [Abstract] |  |
Actual Ratio (in hundredths) | 11.47%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 11.03%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
For Capital Adequacy Purposes (in hundredths) | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Tier I capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | 416,861,000 us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 392,932,000 us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
For Capital Adequacy Purposes | 106,274,000 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 101,730,000 us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
To Be Well-Capitalized Under Prompt Corrective Action Provision | 159,411,000 us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 152,595,000 us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
Actual Ratio (in hundredths) | 15.69%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 15.45%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
For Capital Adequacy Purposes (in hundredths) | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total capital (to risk weighted assets), Amount [Abstract] |  |
Actual Amount | 450,081,000 us-gaap_Capital / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 424,754,000 us-gaap_Capital / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
For Capital Adequacy Purposes | 212,553,000 us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 203,475,000 us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
To Be Well-Capitalized Under Prompt Corrective Action Provision | $ 265,691,000 us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | $ 254,344,000 us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
Actual Ratio (in hundredths) | 16.94%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 16.70%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
For Capital Adequacy Purposes (in hundredths) | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
CTBI and CTB [Member] | Rules in 2015 [Member] |  |
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) | 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodOneMember |
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodOneMember |
Common equity Tier 1 capital ratio under well capitalized (in hundredths) | 6.50%ctbi_CommonEquityTier1CapitalRatioUnderWellCapitalized / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodOneMember |
Tier 1 leverage ratio under well capitalized (in hundredths) | 5.00%ctbi_Tier1LeverageRatioUnderWellCapitalized / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodOneMember |
CTBI and CTB [Member] | Rules from 2015 to 2019 [Member] |  |
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
For Capital Adequacy Purposes (in hundredths) | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodTwoMember |
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
For Capital Adequacy Purposes (in hundredths) | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodTwoMember |
Common equity Tier one capital ratio (in hundredths) | 4.50%ctbi_CommonEquityTierOneCapitalRatio / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodTwoMember |
Tier 1 leverage ratio (in hundredths) | 4.00%ctbi_Tier1LeverageRatio / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodTwoMember |
Capital conservation buffer in 2016 (in hundredths) | 0.625%ctbi_CapitalConservationBufferInYearOne / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodTwoMember |
Capital conservation buffer in 2017 (in hundredths) | 1.25%ctbi_CapitalConservationBufferInYearTwo / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodTwoMember |
Capital conservation buffer in 2018 (in hundredths) | 1.875%ctbi_CapitalConservationBufferInYearThree / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodTwoMember |
Capital conservation buffer in 2019 and thereafter (in hundredths) | 2.50%ctbi_CapitalConservationBufferInYearFourAndThereafter / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodTwoMember |
CTBI and CTB [Member] | Rules in 2019 [Member] |  |
Tier I capital (to risk weighted assets), Ratio [Abstract] |  |
For Capital Adequacy Purposes (in hundredths) | 8.50%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodThreeMember |
Total capital (to risk-weighted assets), Ratio [Abstract] |  |
For Capital Adequacy Purposes (in hundredths) | 10.50%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodThreeMember |
Common equity Tier one capital ratio (in hundredths) | 7.00%ctbi_CommonEquityTierOneCapitalRatio / dei_LegalEntityAxis = us-gaap_ConsolidatedEntityExcludingVariableInterestEntitiesVIEMember / ctbi_PeriodTypeAxis = ctbi_RulesInPeriodThreeMember |

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- Definition Common equity Tier 1 capital ratio required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Total Capital divided by risk weighted assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
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