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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of the provision for income taxes [Abstract]      
Current income tax expense $ 20,194,000us-gaap_CurrentIncomeTaxExpenseBenefit $ 19,418,000us-gaap_CurrentIncomeTaxExpenseBenefit $ 14,784,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) (1,048,000)us-gaap_DeferredIncomeTaxExpenseBenefit 582,000us-gaap_DeferredIncomeTaxExpenseBenefit 5,441,000us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense 19,146,000us-gaap_IncomeTaxExpenseBenefit 20,000,000us-gaap_IncomeTaxExpenseBenefit 20,225,000us-gaap_IncomeTaxExpenseBenefit
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract]      
Computed at the statutory rate 21,839,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 22,810,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 22,781,000us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Adjustments resulting from [Abstract]      
Tax-exempt interest (1,204,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome (1,126,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome (1,278,000)us-gaap_IncomeTaxReconciliationTaxExemptIncome
Housing and new markets credits (1,076,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther (996,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther (704,000)us-gaap_IncomeTaxReconciliationTaxCreditsOther
Dividends received deduction (178,000)us-gaap_IncomeTaxReconciliationDeductionsDividends (291,000)us-gaap_IncomeTaxReconciliationDeductionsDividends (202,000)us-gaap_IncomeTaxReconciliationDeductionsDividends
Bank owned life insurance (503,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance (791,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance (470,000)us-gaap_IncomeTaxReconciliationNondeductibleExpenseLifeInsurance
ESOP dividend deduction (284,000)us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (281,000)us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (271,000)us-gaap_IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
Other, net 552,000us-gaap_IncomeTaxReconciliationOtherAdjustments 675,000us-gaap_IncomeTaxReconciliationOtherAdjustments 369,000us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense 19,146,000us-gaap_IncomeTaxExpenseBenefit 20,000,000us-gaap_IncomeTaxExpenseBenefit 20,225,000us-gaap_IncomeTaxExpenseBenefit
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract]      
Computed at the statutory rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Adjustment resulting from [Abstract]      
Tax-exempt interest (in hundredths) (1.93%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (1.73%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (1.96%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Housing and new markets credits (in hundredths) (1.72%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther (1.52%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther (1.08%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsOther
Dividends received deduction (in hundredths) (0.29%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends (0.45%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends (0.31%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends
Bank owned life insurance (in hundredths) (0.81%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance (1.22%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance (0.72%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLifeInsurance
ESOP dividend deduction (in hundredths) (0.46%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (0.43%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends (0.42%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends
Other, net (in hundredths) 0.88%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.04%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.56%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total (in hundredths) 30.68%us-gaap_EffectiveIncomeTaxRateContinuingOperations 30.69%us-gaap_EffectiveIncomeTaxRateContinuingOperations 31.07%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred tax assets [Abstract]      
Allowance for loan and lease losses 12,019,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses 11,820,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses  
Interest on nonperforming loans 1,039,000ctbi_DeferredTaxAssetsTaxDeferredExpenseInterestOnNonperformingLoans 732,000ctbi_DeferredTaxAssetsTaxDeferredExpenseInterestOnNonperformingLoans  
Accrued expenses 1,911,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 3,370,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities  
Allowance for other real estate owned 1,901,000ctbi_DeferredTaxAssetsTaxDeferredExpenseAllowanceForOtherRealEstateOwned 2,232,000ctbi_DeferredTaxAssetsTaxDeferredExpenseAllowanceForOtherRealEstateOwned  
Unrealized losses on AFS securities 0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 3,717,000us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross  
Other 1,145,000us-gaap_DeferredTaxAssetsOther 232,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 18,015,000us-gaap_DeferredTaxAssetsGross 22,103,000us-gaap_DeferredTaxAssetsGross  
Deferred tax liabilities [Abstract]      
Depreciation and amortization (19,181,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (18,717,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
FHLB stock dividends (3,460,000)ctbi_DeferredTaxLiabilitiesTaxFederalHomeLoanBankStockDividend (4,956,000)ctbi_DeferredTaxLiabilitiesTaxFederalHomeLoanBankStockDividend  
Loan fee income (744,000)ctbi_DeferredTaxLiabilitiesLoanFeeIncome (724,000)ctbi_DeferredTaxLiabilitiesLoanFeeIncome  
Mortgage servicing rights (1,039,000)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights (1,198,000)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights  
Capitalized lease obligations (681,000)ctbi_DeferredTaxLiabilitiesCapitalizedLeaseObligations (1,145,000)ctbi_DeferredTaxLiabilitiesCapitalizedLeaseObligations  
Unrealized gains on AFS securities (1,231,000)ctbi_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecuritiesGross 0ctbi_DeferredTaxLiabilitiesUnrealizedGainsOnAvailableForSaleSecuritiesGross  
Other (1,171,000)us-gaap_DeferredTaxLiabilitiesOther (1,015,000)us-gaap_DeferredTaxLiabilitiesOther  
Total deferred tax liabilities (27,507,000)us-gaap_DeferredIncomeTaxLiabilities (27,755,000)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred tax liability $ (9,492,000)us-gaap_DeferredTaxLiabilities $ (5,652,000)us-gaap_DeferredTaxLiabilities