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Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 Loan | Jun. 30, 2012 Loan | Jun. 30, 2013 Loan | Jun. 30, 2012 Loan | Dec. 31, 2012 Loan
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 32 | 17 | 49 | 21 | 40
Term Modification | $ 2,400 |  | $ 10,608 |  |
Rate Modification | 0 |  | 0 |  |
Combination | 0 |  | 92 |  |
Post-Modification Outstanding Balance | 2,400 | 2,303 | 10,700 | 4,016 | 8,687
Defaulted restructured loans, number of loans | 7 |  | 12 |  |
Defaulted Restructured loans, recorded investment | 4,121 |  | 5,123 |  |
Commercial Construction [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 3 | 5 | 6 | 5 | 5
Term Modification | 493 |  | 2,603 |  |
Rate Modification | 0 |  | 0 |  |
Combination | 0 |  | 0 |  |
Post-Modification Outstanding Balance | 493 | 557 | 2,603 | 557 | 557
Defaulted restructured loans, number of loans | 1 |  | 3 |  |
Defaulted Restructured loans, recorded investment | 831 |  | 1,159 |  |
Commercial Secured by Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 15 | 2 | 20 | 5 | 11
Term Modification | 662 |  | 1,267 |  |
Rate Modification | 0 |  | 0 |  |
Combination | 0 |  | 0 |  |
Post-Modification Outstanding Balance | 662 | 728 | 1,267 | 2,393 | 4,506
Defaulted restructured loans, number of loans | 1 |  | 3 |  |
Defaulted Restructured loans, recorded investment | 1,229 |  | 1,891 |  |
Commercial Other [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 13 | 10 | 22 | 11 | 23
Term Modification | 872 |  | 6,365 |  |
Rate Modification | 0 |  | 0 |  |
Combination | 0 |  | 92 |  |
Post-Modification Outstanding Balance | 872 | 1,018 | 6,457 | 1,066 | 3,233
Defaulted restructured loans, number of loans | 5 |  | 6 |  |
Defaulted Restructured loans, recorded investment | 2,061 |  | 2,073 |  |
Real Estate Mortgage [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 1 |  | 1 |  | 1
Term Modification | 373 |  | 373 |  |
Rate Modification | 0 |  | 0 |  |
Combination | 0 |  | 0 |  |
Post-Modification Outstanding Balance | $ 373 |  | $ 373 |  | $ 391

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