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Cash and Due from Banks and Interest Bearing Deposits (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash and Cash Equivalents [Line Items]
Balance requirements	$ 64.5us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations	$ 60.0us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
Federal Reserve [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	40.9us-gaap_CashUninsuredAmount / ctbi_NameOfFinancialInstitutionAxis = ctbi_FederalReserveMember
Fifth Third Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	22.1us-gaap_CashUninsuredAmount / ctbi_NameOfFinancialInstitutionAxis = ctbi_FifthThirdBankMember
Federal Home Loan Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	$ 3.4us-gaap_CashUninsuredAmount / ctbi_NameOfFinancialInstitutionAxis = ctbi_FederalHomeLoanBankMember

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- Definition

Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 305

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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