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v2.4.1.9

Off-Balance Sheet Transactions and Guarantees (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Off-balance sheet risks [Line Items] |  |
Total off-balance sheet financial instruments | $ 487,904,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability | $ 445,664,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Percentage of secured standby letters of credit (in hundredths) | 81.00%ctbi_PercentageOfSecuredStandbyLettersOfCredit |
Standby letters of credit secured by cash | 20,600,000 ctbi_StandbyLettersOfCreditSecuredByCash |
Fixed rate loan commitments amount | 36,600,000 ctbi_CommitmentToExtendCreditWithFixedInterestRate |
Period of commitment to sell the loans at specified prices | 60 days |
Total mortgage loans in process | 300,000 us-gaap_LoansAndLeasesReceivableLoansInProcess | 1,600,000 us-gaap_LoansAndLeasesReceivableLoansInProcess
Mortgage loans held for sale | 2,300,000 us-gaap_LoansHeldForSaleMortgages | 800,000 us-gaap_LoansHeldForSaleMortgages
Minimum [Member] |  |
Off-balance sheet risks [Line Items] |  |
Interest rate on loan commitments (in hundredths) | 3.50%ctbi_InterestRateOnLoanCommitments / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |
Off-balance sheet risks [Line Items] |  |
Interest rate on loan commitments (in hundredths) | 5.00%ctbi_InterestRateOnLoanCommitments / us-gaap_RangeAxis = us-gaap_MaximumMember |
Fixed rate loan commitments term | 1 year |
Standby Letters of Credit [Member] |  |
Off-balance sheet risks [Line Items] |  |
Total off-balance sheet financial instruments | 28,524,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember | 34,861,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember
Credit loss reserve | 4,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_FinancialInstrumentAxis = us-gaap_StandbyLettersOfCreditMember |
Commitments to Extend Additional Credit [Member] |  |
Off-balance sheet risks [Line Items] |  |
Total off-balance sheet financial instruments | 459,380,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember | 410,803,000 us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember
Credit loss reserve | $ 223,000 us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense / us-gaap_FinancialInstrumentAxis = us-gaap_CommitmentsToExtendCreditMember |

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- Definition Loan commitments that are legally binding commitments to extend credit at a specified fixed interest rate to a counterparty under certain terms and conditions. + References No definition available. + Details
Name: | ctbi_CommitmentToExtendCreditWithFixedInterestRate
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This line item represents the term of fixed rate loan commitments agreed by the entity for the period. + References No definition available. + Details
Name: | ctbi_FixedRateLoanCommitmentsTerm
Namespace Prefix: | ctbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition This line item represents the percentage of interest rate on loan commitments agreed by the entity for the period. + References No definition available. + Details
Name: | ctbi_InterestRateOnLoanCommitments
Namespace Prefix: | ctbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This line item represents the percentage of secured standby letters of credit out of total standby letters of credit. + References No definition available. + Details
Name: | ctbi_PercentageOfSecuredStandbyLettersOfCredit
Namespace Prefix: | ctbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This line item represents the period of commitment to sell the loans at specified prices by the entity. + References No definition available. + Details
Name: | ctbi_PeriodOfCommitmentToSellLoansAtSpecifiedPrices
Namespace Prefix: | ctbi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of off-balance sheet standby letters of credit that is secured by cash of the borrower. + References No definition available. + Details
Name: | ctbi_StandbyLettersOfCreditSecuredByCash
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The face amount of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References No definition available. + Details
Name: | us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a),(b),(c) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 + Details
Name: | us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
Name: | us-gaap_LoansAndLeasesReceivableLoansInProcess
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount classified as mortgage loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6490309&loc=d3e48678-111004 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Permanent Investor -URI http://asc.fasb.org/extlink&oid=6520390 + Details
Name: | us-gaap_LoansHeldForSaleMortgages
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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