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Securities (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Available-for-sale Debt Securities [Abstract] |  |  |
Amortized cost | $ 613,395,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | $ 566,753,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |
Gross unrealized gains | 7,358,000 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 6,457,000 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |
Gross unrealized losses | (5,456,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (16,587,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |
Fair value | 615,297,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 556,623,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities |
Available-for-sale Equity Securities [Abstract] |  |  |
Amortized cost | 25,000,000 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis |  |
Securities Available-for-Sale [Abstract] |  |  |
Amortized cost | 638,395,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 621,753,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Gross unrealized gains | 7,358,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax | 6,457,000 us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax |
Gross unrealized losses | (5,567,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax | (18,805,000)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax |
Fair value | 640,186,000 us-gaap_AvailableForSaleSecurities | 609,405,000 us-gaap_AvailableForSaleSecurities |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Due in one year or less | 9,153,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost |  |
Due after one through five years | 124,725,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost |  |
Due after five through ten years | 141,407,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost |  |
Due after ten years | 49,229,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost |  |
U.S. government sponsored agency mortgage-backed securities | 288,881,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost |  |
Amortized cost | 613,395,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis | 566,753,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |
Marketable equity securities | 25,000,000 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis |  |
Amortized cost | 638,395,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost | 621,753,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost |
Available-for-Sale, Fair Value [Abstract] |  |  |
Due in one year or less | 9,193,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |  |
Due after one through five years | 125,444,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |  |
Due after five through ten years | 141,625,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |  |
Due after ten years | 50,128,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue |  |
U.S. government sponsored agency mortgage-backed securities | 288,907,000 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue |  |
Total debt securities | 615,297,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities | 556,623,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities |
Marketable equity securities | 24,889,000 ctbi_AvailableForSaleSecuritiesEquityMaturitiesFairValue |  |
Total securities | 640,186,000 ctbi_AvailableForSaleSecuritiesMaturitiesFairValue |  |
Securities gains (loss), net | (211,000)us-gaap_GainLossOnSaleOfSecuritiesNet | (45,000)us-gaap_GainLossOnSaleOfSecuritiesNet | 1,155,000 us-gaap_GainLossOnSaleOfSecuritiesNet
Realized pre-tax gain on sale of securities | 2,100,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |  |
Realized pre-tax loss on sale of securities | 2,400,000 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses |  |
Securities pledged as collateral to secure public deposit and for other purposes | 267,100,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral | 257,500,000 us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral |
Amortized cost of securities sold under agreements to repurchase | 280,900,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross | 255,400,000 us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseGross |
Percentage of total investment with unrealized losses (in hundredths) | 44.10%ctbi_PercentageOfTotalInvestmentWithUnrealizedLosses | 67.80%ctbi_PercentageOfTotalInvestmentWithUnrealizedLosses |
Severity of impairment in percentage of fair value less than cost (in hundredths) | 0.40%ctbi_SeverityOfImpairmentInPercentageOfFairValueLessThanCost |  |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 115,100,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost | 382,620,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost |
12 Months or More | 172,906,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost | 49,968,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost |
Total | 288,006,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost | 432,588,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (663,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss | (14,806,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss |
12 Months or More | (4,904,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss | (3,999,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss |
Total | (5,567,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss | (18,805,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 114,437,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue | 367,814,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue |
12 Months or More | 168,002,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 45,969,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue |
Total | 282,439,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue | 413,783,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue |
Securities Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 1,662,000 us-gaap_HeldToMaturitySecurities | 1,662,000 us-gaap_HeldToMaturitySecurities |
Gross Unrealized Gains | 1,000 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain | 1,000 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain |
Gross Unrealized Losses | (19,000)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss | (62,000)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss |
Fair Value | 1,644,000 us-gaap_HeldToMaturitySecuritiesFairValue | 1,601,000 us-gaap_HeldToMaturitySecuritiesFairValue |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
Due in one year or less | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount |  |
Due after one through five years | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount |  |
Due after five through ten years | 1,662,000 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount |  |
Due after ten years | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount |  |
U.S. government sponsored agency mortgage-backed securities | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount |  |
Amortized Cost | 1,662,000 us-gaap_HeldToMaturitySecurities | 1,662,000 us-gaap_HeldToMaturitySecurities |
Marketable equity securities | 0 ctbi_HeldToMaturitySecuritiesEquityMaturitiesNetCarryingAmount |  |
Total securities | 1,662,000 ctbi_HeldToMaturitySecuritiesMaturitiesNetCarryingAmount |  |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Due in one year or less | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue |  |
Due after one through five years | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue |  |
Due after five through ten years | 1,644,000 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue |  |
Due after ten years | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue |  |
U.S. government sponsored agency mortgage-backed securities | 0 us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue |  |
Total debt securities | 1,644,000 us-gaap_HeldToMaturitySecuritiesFairValue | 1,601,000 us-gaap_HeldToMaturitySecuritiesFairValue |
Marketable equity securities | 0 ctbi_HeldToMaturitySecuritiesEquityMaturitiesFairValue |  |
Total securities | 1,644,000 ctbi_HeldToMaturitySecuritiesMaturitiesFairValue |  |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
12 Months or More | 480,000 ctbi_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost | 480,000 ctbi_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost |
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |
12 Months or More | (19,000)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss | (62,000)us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss |
Held-to-Maturity, Fair Value [Abstract] |  |  |
12 Months or More | 461,000 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue | 418,000 us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue |
U.S. Treasury and Government Agencies [Member] |  |  |
Securities Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 480,000 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember | 480,000 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember |
Gross Unrealized Gains | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember |
Gross Unrealized Losses | (19,000)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember | (62,000)us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember |
Fair Value | 461,000 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember | 418,000 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
Amortized Cost | 480,000 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember | 480,000 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Total debt securities | 461,000 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember | 418,000 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USTreasuryAndGovernmentMember |
State and Political Subdivisions [Member] |  |  |
Securities Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 1,182,000 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 1,182,000 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Gross Unrealized Gains | 1,000 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 1,000 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Gross Unrealized Losses | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 0 us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Fair Value | 1,183,000 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 1,183,000 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
Amortized Cost | 1,182,000 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 1,182,000 us-gaap_HeldToMaturitySecurities / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Total debt securities | 1,183,000 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 1,183,000 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_DebtSecurityAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
U.S. Treasury and Government Agencies [Member] |  |  |
Available-for-sale Debt Securities [Abstract] |  |  |
Amortized cost | 190,563,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 77,838,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Gross unrealized gains | 509,000 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 277,000 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Gross unrealized losses | (2,140,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | (5,492,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Fair value | 188,932,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 72,623,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Amortized cost | 190,563,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 77,838,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Available-for-Sale, Fair Value [Abstract] |  |  |
Total debt securities | 188,932,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 72,623,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 31,185,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 31,631,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
12 Months or More | 65,209,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 35,750,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Total | 96,394,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 67,381,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (87,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | (1,970,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
12 Months or More | (2,053,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | (3,522,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Total | (2,140,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | (5,492,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 31,098,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 29,661,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
12 Months or More | 63,156,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 32,228,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
Total | 94,254,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember | 61,889,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasuryAndGovernmentMember |
State and Political Subdivisions [Member] |  |  |
Available-for-sale Debt Securities [Abstract] |  |  |
Amortized cost | 133,951,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 118,055,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Gross unrealized gains | 3,973,000 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 1,907,000 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Gross unrealized losses | (466,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | (3,259,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Fair value | 137,458,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 116,703,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Amortized cost | 133,951,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 118,055,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Available-for-Sale, Fair Value [Abstract] |  |  |
Total debt securities | 137,458,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 116,703,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 8,800,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 57,165,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
12 Months or More | 21,308,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 7,639,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Total | 30,108,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 64,804,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (23,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | (2,789,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
12 Months or More | (443,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | (470,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Total | (466,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | (3,259,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 8,777,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 54,376,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
12 Months or More | 20,865,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 7,169,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
Total | 29,642,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember | 61,545,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |  |
Available-for-sale Debt Securities [Abstract] |  |  |
Amortized cost | 288,881,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 370,860,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Gross unrealized gains | 2,876,000 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 4,273,000 us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Gross unrealized losses | (2,850,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | (7,836,000)us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Fair value | 288,907,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 367,297,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Amortized cost | 288,881,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 370,860,000 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Available-for-Sale, Fair Value [Abstract] |  |  |
Total debt securities | 288,907,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 367,297,000 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 50,115,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 238,824,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
12 Months or More | 86,389,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 6,579,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Total | 136,504,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 245,403,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (442,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | (7,829,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
12 Months or More | (2,408,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | (7,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Total | (2,850,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | (7,836,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 49,673,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 230,995,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
12 Months or More | 83,981,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 6,572,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Total | 133,654,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember | 237,567,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |
Debt Securities [Member] |  |  |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 90,100,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 327,620,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
12 Months or More | 172,906,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 49,968,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
Total | 263,006,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 377,588,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (552,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | (12,588,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
12 Months or More | (4,904,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | (3,999,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
Total | (5,456,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | (16,587,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 89,548,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 315,032,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
12 Months or More | 168,002,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 45,969,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
Total | 257,550,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember | 361,001,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |
Marketable Equity Securities [Member] |  |  |
Available-for-sale Equity Securities [Abstract] |  |  |
Amortized cost | 25,000,000 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 55,000,000 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Gross unrealized gains | 0 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedGainBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Gross unrealized losses | (111,000)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (2,218,000)us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Fair value | 24,889,000 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 52,782,000 us-gaap_AvailableForSaleSecuritiesEquitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Marketable equity securities | 25,000,000 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 55,000,000 us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 25,000,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 55,000,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
12 Months or More | 0 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Total | 25,000,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 55,000,000 ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (111,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (2,218,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
12 Months or More | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Total | (111,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | (2,218,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 24,889,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 52,782,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
12 Months or More | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 0 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Total | 24,889,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember | 52,782,000 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember |
Fixed Income Mutual Funds [Member] |  |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Marketable equity securities, fair value | 24,900,000 us-gaap_MarketableSecuritiesEquitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeFundsMember |  |
Marketable equity securities, total unrealized losses | $ 111,000 ctbi_MarketableEquitySecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedIncomeFundsMember |  |

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- Definition Carrying amount of equity securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments. + References No definition available. + Details
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