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Other Real Estate Owned (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Activity for other real estate owned [Roll Forward]      
Beginning balance of other real estate owned $ 39,188,000us-gaap_RealEstateAcquiredThroughForeclosure $ 47,537,000us-gaap_RealEstateAcquiredThroughForeclosure  
New assets acquired 12,199,000ctbi_RealEstateNewAssetsAcquired 7,429,000ctbi_RealEstateNewAssetsAcquired  
Capitalized costs 0us-gaap_RealEstateImprovements 6,000us-gaap_RealEstateImprovements  
Fair value adjustments (1,730,000)ctbi_FairValueAdjustmentsToOtherRealEstateOwned (2,480,000)ctbi_FairValueAdjustmentsToOtherRealEstateOwned (2,704,000)ctbi_FairValueAdjustmentsToOtherRealEstateOwned
Sale of assets (12,881,000)us-gaap_RealEstateCostOfRealEstateSold (13,304,000)us-gaap_RealEstateCostOfRealEstateSold  
Ending balance of other real estate owned 36,776,000us-gaap_RealEstateAcquiredThroughForeclosure 39,188,000us-gaap_RealEstateAcquiredThroughForeclosure 47,537,000us-gaap_RealEstateAcquiredThroughForeclosure
Carrying cost and fair value adjustments for foreclosed properties $ 3,900,000ctbi_CarryingCostAndFairValueAdjustmentForForeclosedProperties1 $ 5,200,000ctbi_CarryingCostAndFairValueAdjustmentForForeclosedProperties1 $ 5,300,000ctbi_CarryingCostAndFairValueAdjustmentForForeclosedProperties1