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Off-Balance Sheet Transactions and Guarantees (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Off-balance Sheet Risks Transactions and Guarantees [Abstract] |  |
Total off-balance sheet financial instruments | $ 656,046 | $ 594,908
Mortgage loans held for sale | 23,259 | 1,167
Standby Letters of Credit [Member] |  |
Fair Value, Off-balance Sheet Risks Transactions and Guarantees [Abstract] |  |
Total off-balance sheet financial instruments | 32,126 | 30,679
Credit loss reserve | $ 100 |
Percentage of secured standby letters of credit | 65.00% |
Standby letters of credit secured by cash | $ 15,300 |
Commitments to Extend Credit [Member] |  |
Fair Value, Off-balance Sheet Risks Transactions and Guarantees [Abstract] |  |
Total off-balance sheet financial instruments | 623,920 | 564,229
Credit loss reserve | 600 |
Fixed rate loan commitments amount | $ 25,200 |
Period of commitment to sell the loans at specified prices | 60 days |
Total mortgage loans in process | $ 19,000 | 3,800
Mortgage loans held for sale | $ 23,300 | $ 1,200
Commitments to Extend Credit [Member] | Minimum [Member] |  |
Fair Value, Off-balance Sheet Risks Transactions and Guarantees [Abstract] |  |
Interest rate on loan commitments | 3.63% |
Commitments to Extend Credit [Member] | Maximum [Member] |  |
Fair Value, Off-balance Sheet Risks Transactions and Guarantees [Abstract] |  |
Interest rate on loan commitments | 5.50% |
Fixed rate loan commitments term | 1 year |

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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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- References No definition available. + Details
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- Definition This line item represents the term of fixed rate loan commitments agreed by the entity for the period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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
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Namespace Prefix: | ctbi_
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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

X
- Definition This line item represents the period of commitment to sell the loans at specified prices by the entity, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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
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Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
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Balance Type: | credit
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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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
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- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
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- Details
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