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Off-Balance Sheet Transactions and Guarantees (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	$ 427,500,000	$ 425,937,000
Percentage of secured standby letters of credit (in hundredths)	87.00%
Secured standby letter of credit	30,300,000
Fixed rate loan commitments amount	19,900,000
Period of commitment to sell the loans at specified prices	60 days
Total mortgage loans in process	2,600,000	5,100,000
Mortgage loans held for sale	22,500,000	500,000
Minimum [Member]
Off-balance sheet risks [Line Items]
Interest rate on loan commitments (in hundredths)	4.50%
Fixed rate loan commitments term	6 months
Maximum [Member]
Off-balance sheet risks [Line Items]
Interest rate on loan commitments (in hundredths)	5.50%
Fixed rate loan commitments term	1 year
Standby Letters of Credit [Member]
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	41,207,000	50,201,000
Credit loss reserve	5,000
Commitments to Extend Credit [Member]
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	386,293,000	375,736,000
Credit loss reserve	$ 193,000

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

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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 letter of credit that is secured by assets of the borrower.

+ References

No definition available.

+ Details

Name:	ctbi_SecuredStandbyLetterOfCredit
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

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X

- Definition

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

+ References

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

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph g

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

+ Details

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

X

- Definition

Carrying amount of mortgage loans to individuals not classified as held for investment but are held-for-sale.

+ References

Reference 1: 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



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 65

-Paragraph 1, 34

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph h

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-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.



Reference 6: 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

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X

- Definition

Alternate concept name for the aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies.

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 94-5

-Paragraph 11

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph a

-Article 7

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