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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
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Cash and Cash Equivalents [Line Items] |  |
Balance requirements | $ 64.5 us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations | $ 60.0 us-gaap_CashAndSecuritiesSegregatedUnderFederalAndOtherRegulations
Federal Reserve [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash accounts which exceeded federally insured limits | 40.9 us-gaap_CashUninsuredAmount / ctbi_NameOfFinancialInstitutionAxis = ctbi_FederalReserveMember |
Fifth Third Bank [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash accounts which exceeded federally insured limits | 22.1 us-gaap_CashUninsuredAmount / ctbi_NameOfFinancialInstitutionAxis = ctbi_FifthThirdBankMember |
Federal Home Loan Bank [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash accounts which exceeded federally insured limits | $ 3.4 us-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 + Details
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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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