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Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock [Member] | Capital Surplus [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss), Net of Tax | Total
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Balance at Dec. 31, 2011 | $ 77,151 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 156,101 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 123,431 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 10,183 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 366,866 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2011 | 16,972,994 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Net income |  |  | 44,862 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 44,862 us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax |  |  |  | 2,482 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 2,482 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Cash dividends declared |  |  | (19,349)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (19,349)us-gaap_DividendsCommonStockCash
Issuance of common stock | 912 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,483 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 4,395 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock (in shares) | 200,873 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of restricted stock | 2 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (2)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Issuance of restricted stock (shares) | 364 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock-based compensation and related excess tax benefits |  | 1,088 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,088 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Balance at Dec. 31, 2012 | 78,065 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 160,670 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 148,944 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 12,665 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 400,344 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2012 | 17,174,231 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Net income |  |  | 45,172 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 45,172 us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax |  |  |  | (20,691)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (20,691)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Cash dividends declared |  |  | (19,827)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (19,827)us-gaap_DividendsCommonStockCash
Issuance of common stock | 1,038 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5,310 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 6,348 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock (in shares) | 228,260 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of restricted stock | 4 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (4)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Issuance of restricted stock (shares) | 950 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock-based compensation and related excess tax benefits |  | 1,146 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,146 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Balance at Dec. 31, 2013 | 79,107 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 167,122 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 174,289 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (8,026)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 412,492 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2013 | 17,403,441 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 17,403,441 us-gaap_CommonStockSharesOutstanding
Increase (Decrease) in Stockholders' Equity [Roll forward] |  |  |  |  |
Net income |  |  | 43,251 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 43,251 us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax |  |  |  | 9,190 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 9,190 us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Cash dividends declared |  |  | (20,539)us-gaap_DividendsCommonStockCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (20,539)us-gaap_DividendsCommonStockCash
Issuance of 10% stock dividend | 7,910 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 44,394 us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (52,304)us-gaap_StockIssuedDuringPeriodValueStockDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | 0 us-gaap_StockIssuedDuringPeriodValueStockDividend
Issuance of common stock | 346 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,646 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,992 us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of common stock (in shares) | 69,138 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Vesting of restricted stock | (45)ctbi_VestingOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 45 ctbi_VestingOfRestrictedStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0 ctbi_VestingOfRestrictedStock
Vesting of restricted stock (shares) | (8,945)ctbi_VestingOfRestrictedStockShares / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of restricted stock | 23 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (23)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Issuance of restricted stock (shares) | 4,576 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Forfeiture of restricted stock | (9)us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 9 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 0 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
Forfeiture of restricted stock (shares) | (1,835)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Stock-based compensation and related excess tax benefits |  | 1,491 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,491 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Balance at Dec. 31, 2014 | $ 87,332 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 214,684 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 144,697 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 1,164 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 447,877 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in shares) at Dec. 31, 2014 | 17,466,375 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  | 17,466,375 us-gaap_CommonStockSharesOutstanding

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