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Cash and Due from Banks and Interest Bearing Deposits (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Cash and Due from Banks and Interest Bearing Deposits [Abstract] |  |  |
Balance requirements | $ 56,800,000 | $ 52,100,000 |
Increased FDIC Insurance limits | 250,000 | 250,000 | 250,000
Federal Home Loan Bank interest bearing deposit | 3,500,000 |  |
Deposits with Federal Reserve which are not subject to FDIC insurance | 124,000,000 |  |
Noninterest bearing Deposit | 35,400,000 |  |
Noninterest Bearing Deposit, with Federal Reserve which are not subject to FDIC insurance effective 1/1/13 | $ 34,900,000 |  |

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- Definition Interest-bearing deposits in federal home Loan bank for relatively short periods of time including, for example, certificates of deposits, which are presented separately from cash on the balance sheet. + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Refers to increased FDIC's insurance limits. + References No definition available. + Details
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Non interest-bearing deposits in other financial institutions for relatively short periods of time. + References No definition available. + Details
Name: | ctbi_NoninterestBearingDeposit
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of non interest bearing deposit as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
Name: | ctbi_NoninterestBearingDepositUninsuredAmount
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: | na
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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 AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 80 -Subparagraph Exhibit 4-8, 3 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 21 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant