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Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 Loan | Dec. 31, 2012 Loan
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 64 | 39
Term Modification | $ 12,015 | $ 7,398
Rate Modification | 0 | 391
Combination | 3,072 | 893
Post-Modification Outstanding Balance | 15,087 | 8,682
Defaulted restructured loans, number of loans | 9 | 7
Defaulted Restructured loans, recorded investment | 1,058 | 427
Commercial Construction [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 6 | 5
Term Modification | 2,603 | 557
Rate Modification | 0 | 0
Combination | 0 | 0
Post-Modification Outstanding Balance | 2,603 | 557
Commercial Secured by Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 27 | 11
Term Modification | 2,568 | 3,624
Rate Modification | 0 | 0
Combination | 2,920 | 882
Post-Modification Outstanding Balance | 5,488 | 4,506
Defaulted restructured loans, number of loans | 2 | 1
Defaulted Restructured loans, recorded investment | 89 | 344
Commercial Other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 30 | 22
Term Modification | 6,471 | 3,217
Rate Modification | 0 | 0
Combination | 152 | 11
Post-Modification Outstanding Balance | 6,623 | 3,228
Defaulted restructured loans, number of loans | 6 | 6
Defaulted Restructured loans, recorded investment | 596 | 83
Real Estate Mortgage [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 1 | 1
Term Modification | 373 | 0
Rate Modification | 0 | 391
Combination | 0 | 0
Post-Modification Outstanding Balance | 373 | 391
Defaulted restructured loans, number of loans | 1 |
Defaulted Restructured loans, recorded investment | $ 373 |

X
- Definition Combination under troubled debt restructurings during the period. + References No definition available. + Details
Name: | ctbi_Combination
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the current reporting period and for which there was a payment default. + References No definition available. + Details
Name: | ctbi_FinancingReceivableModificationsSubsequentDefaultNumberOfContract
Namespace Prefix: | ctbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the current reporting period, for which there was a payment default. + References No definition available. + Details
Name: | ctbi_FinancingReceivableModificationSubsequentDefaultRecordedInvestment
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of financing receivables under troubled debt restructurings during the period. + References No definition available. + Details
Name: | ctbi_NumberOfLoans
Namespace Prefix: | ctbi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rate modification under troubled debt restructurings during the period. + References No definition available. + Details
Name: | ctbi_RateModification
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Term modification under troubled debt restructurings during the period. + References No definition available. + Details
Name: | ctbi_TermModification
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total modification under troubled debt restructurings during the period. + References No definition available. + Details
Name: | ctbi_TotalModification
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration