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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 | 5 ctbi_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 | $ 65,490,000 us-gaap_Goodwill | $ 65,490,000 us-gaap_Goodwill |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance, January 1 | 690,000 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Ending balance, December 31 | 477,000 us-gaap_FiniteLivedIntangibleAssetsNet |  |
Segment Reporting [Abstract] |  |  |
Number of operating segments | 1 us-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) | 1,582,137 us-gaap_CommonStockDividendsShares |  |
Fair value of additional shares issued | 0 us-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 | 7,910,000 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Additional Paid-in Capital [Member] |  |  |
Reclassifications [Abstract] |  |  |
Fair value of additional shares issued | 44,394,000 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |
Core Deposit Intangible [Member] |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |
Beginning balance, January 1 | 690,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 904,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 1,117,000 us-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 | 477,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 690,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember | 904,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember
Amortization of intangible assets for year one | 200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  |
Amortization of intangible assets for year two | 200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |  |
Amortization of intangible assets for year three | $ 100,000 us-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) | 12 ctbi_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 |  |

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- 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. + References No definition available. + Details
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- Definition The maximum number of payments 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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