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Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 Loan | Sep. 30, 2012 Loan | Sep. 30, 2013 Loan | Sep. 30, 2012 Loan | Dec. 31, 2012 Loan
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 10 | 4 | 59 | 26 | 39
Term Modification | $ 1,008 | $ 45 | $ 11,616 | $ 4,864 | $ 7,398
Rate Modification | 0 | 391 | 0 | 391 | 391
Combination | 60 | 666 | 152 | 882 | 893
Post-Modification Outstanding Balance | 1,068 | 1,102 | 11,768 | 6,137 | 8,682
Defaulted restructured loans, number of loans | 3 | 3 | 8 | 6 |
Defaulted Restructured loans, recorded investment | 242 | 410 | 2,272 | 415 |
Commercial Construction [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans |  |  | 6 | 5 | 5
Term Modification |  |  | 2,603 | 557 | 557
Rate Modification |  |  | 0 | 0 | 0
Combination |  |  | 0 | 0 | 0
Post-Modification Outstanding Balance |  |  | 2,603 | 557 | 557
Defaulted restructured loans, number of loans | 0 | 0 | 0 | 0 |
Defaulted Restructured loans, recorded investment | 0 | 0 | 0 | 0 |
Commercial Secured by Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 3 | 2 | 23 | 8 | 11
Term Modification | 905 | 0 | 2,172 | 3,196 | 3,624
Rate Modification | 0 | 0 | 0 | 0 | 0
Combination | 0 | 666 | 0 | 882 | 882
Post-Modification Outstanding Balance | 905 | 666 | 2,172 | 4,078 | 4,506
Defaulted restructured loans, number of loans | 1 | 1 | 1 | 1 |
Defaulted Restructured loans, recorded investment | 69 | 344 | 69 | 344 |
Commercial Other [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans | 7 | 1 | 29 | 12 | 22
Term Modification | 103 | 45 | 6,468 | 1,111 | 3,217
Rate Modification | 0 | 0 | 0 | 0 | 0
Combination | 60 | 0 | 152 | 0 | 11
Post-Modification Outstanding Balance | 163 | 45 | 6,620 | 1,111 | 3,228
Defaulted restructured loans, number of loans | 2 | 2 | 7 | 5 |
Defaulted Restructured loans, recorded investment | 173 | 66 | 2,202 | 71 |
Real Estate Mortgage [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Number of Loans |  | 1 | 1 | 1 | 1
Term Modification |  | 0 | 373 | 0 | 0
Rate Modification |  | 391 | 0 | 391 | 391
Combination |  | 0 | 0 | 0 | 0
Post-Modification Outstanding Balance |  | $ 391 | $ 373 | $ 391 | $ 391

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

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- 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

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- 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

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- Details
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