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Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Maturity period of certificates of deposit in other banks	18 months
Threshold past due period after which loan must be well secured and in the process of collection to continue accruing interest	90 days
Minimum threshold period for not reclassifying loans as accruing loans	6 months
Charge off threshold for unsecured commercial loans considered uncollectible	90 days
Charge off threshold for closed-end consumer loans and uncollectible loans	120 days
Number of monthly payments before loan charge off	5ctbi_NumberOfMonthlyPaymentsBeforeLoanChargeOff
Current value assessment period for past due loans secured against real estate	90 days
Foreclosure proceedings initiated	120 days
Other Real Estate Owned [Abstract]
Typical frequency of periodic reviews, minimum	12 months
Typical frequency of periodic reviews, maximum	18 months
Maximum frequency of periodic reviews	24 months
Goodwill and Core Deposit Intangible [Abstract]
Goodwill	$ 65,490,000us-gaap_Goodwill	$ 65,490,000us-gaap_Goodwill
Finite-lived Intangible Assets [Roll Forward]
Beginning balance, January 1	690,000us-gaap_FiniteLivedIntangibleAssetsNet
Ending balance, December 31	477,000us-gaap_FiniteLivedIntangibleAssetsNet
Segment Reporting [Abstract]
Number of operating segments	1us-gaap_NumberOfOperatingSegments
Reclassifications [Abstract]
Stock dividend rate (in hundredths)	10.00%ctbi_DividendRatePercentage
Dividend record date	May 15, 2014
New shares issued in stock dividend (in shares)	1,582,137us-gaap_CommonStockDividendsShares
Fair value of additional shares issued	0us-gaap_StockIssuedDuringPeriodValueStockDividend
Retained Earnings [Member]
Reclassifications [Abstract]
Fair value of additional shares issued	(52,304,000)us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Common Stock [Member]
Reclassifications [Abstract]
Fair value of additional shares issued	7,910,000us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
Additional Paid-in Capital [Member]
Reclassifications [Abstract]
Fair value of additional shares issued	44,394,000us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Core Deposit Intangible [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance, January 1	690,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember	904,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember	1,117,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember
Amortization	(213,000)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember	(214,000)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember	(213,000)us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember
Ending balance, December 31	477,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember	690,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember	904,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember
Amortization of intangible assets for year one	200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember
Amortization of intangible assets for year two	200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember
Amortization of intangible assets for year three	$ 100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Historical loan loss review period (in quarters)	12ctbi_HistoricalLoanLossReviewPeriod / us-gaap_RangeAxis = us-gaap_MinimumMember
Minimum [Member] | Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Maximum [Member] | Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years

X

- Definition

The maximum number of days that a closed-end loan (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) may be delinquent before being charged-off. If a loan is considered uncollectable, it is charged off earlier.

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Foreclosure proceedings initiated

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Loans are not reclassified as accruing until principal and interest payments remain current for a period of time.

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Refers to the threshold past due period during which a loan must be well secured and in the process of collection to continue accruing interest.

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Number of days for unsecured commercial loans considered to be uncollectible before they are written off.

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