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Off-Balance Sheet Transactions and Guarantees (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	$ 487,904,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability	$ 445,664,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Percentage of secured standby letters of credit (in hundredths)	81.00%ctbi_PercentageOfSecuredStandbyLettersOfCredit
Standby letters of credit secured by cash	20,600,000ctbi_StandbyLettersOfCreditSecuredByCash
Fixed rate loan commitments amount	36,600,000ctbi_CommitmentToExtendCreditWithFixedInterestRate
Period of commitment to sell the loans at specified prices	60 days
Total mortgage loans in process	300,000us-gaap_LoansAndLeasesReceivableLoansInProcess	1,600,000us-gaap_LoansAndLeasesReceivableLoansInProcess
Mortgage loans held for sale	2,300,000us-gaap_LoansHeldForSaleMortgages	800,000us-gaap_LoansHeldForSaleMortgages
Minimum [Member]
Off-balance sheet risks [Line Items]
Interest rate on loan commitments (in hundredths)	3.50%ctbi_InterestRateOnLoanCommitments / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
Off-balance sheet risks [Line Items]
Interest rate on loan commitments (in hundredths)	5.00%ctbi_InterestRateOnLoanCommitments / us-gaap_RangeAxis = us-gaap_MaximumMember
Fixed rate loan commitments term	1 year
Standby Letters of Credit [Member]
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	28,524,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember	34,861,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember
Credit loss reserve	4,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember
Commitments to Extend Additional Credit [Member]
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	459,380,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember	410,803,000us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Credit loss reserve	$ 223,000us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember

X

- Definition

Loan commitments that are legally binding commitments to extend credit at a specified fixed interest rate to a counterparty under certain terms and conditions.

+ References

No definition available.

+ Details

Name:	ctbi_CommitmentToExtendCreditWithFixedInterestRate
Namespace Prefix:	ctbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

This line item represents the term of fixed rate loan commitments agreed by the entity for the period.

+ References

No definition available.

+ Details

Name:	ctbi_FixedRateLoanCommitmentsTerm
Namespace Prefix:	ctbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This line item represents the percentage of interest rate on loan commitments agreed by the entity for the period.

+ References

No definition available.

+ Details

Name:	ctbi_InterestRateOnLoanCommitments
Namespace Prefix:	ctbi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This line item represents the percentage of secured standby letters of credit out of total standby letters of credit.

+ References

No definition available.

+ Details

Name:	ctbi_PercentageOfSecuredStandbyLettersOfCredit
Namespace Prefix:	ctbi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This line item represents the period of commitment to sell the loans at specified prices by the entity.

+ References

No definition available.

+ Details

Name:	ctbi_PeriodOfCommitmentToSellLoansAtSpecifiedPrices
Namespace Prefix:	ctbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of off-balance sheet standby letters of credit that is secured by cash of the borrower.

+ References

No definition available.

+ Details

Name:	ctbi_StandbyLettersOfCreditSecuredByCash
Namespace Prefix:	ctbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 3

-Subparagraph (a),(b),(c)

-URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437

+ Details

Name:	us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableLoansInProcess
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount classified as mortgage loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6490309&loc=d3e48678-111004



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Permanent Investor

-URI http://asc.fasb.org/extlink&oid=6520390

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
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