XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.21.1

Fair Market Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value | $ 2,243 | $ 2,471
Mortgage servicing rights | 5,584 | 4,068
Collateral dependent loans | 563 | 1,768
Other real estate owned | $ 530 | $ 2,395
Conversion Rate [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 1.6228 |
Dividend Rate [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 0.5193 |
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 0.080 | 0.080
Mortgage servicing rights, measurement input | 0.100 | 0.100
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 0.120 | 0.120
Mortgage servicing rights, measurement input | 0.115 | 0.115
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Discount Rate [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input | 0.100 | 0.100
Mortgage servicing rights, measurement input | 0.101 | 0.101
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input, conversion date | Dec. 31, 2023 | Dec. 31, 2022
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input, conversion date | Dec. 31, 2027 | Dec. 31, 2026
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Conversion Date [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Equity securities at fair value, measurement input, conversion date | Dec. 31, 2025 | Dec. 31, 2024
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.000 | 0.000
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.365 | 0.328
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Constant Prepayment Rate [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.110 | 0.157
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.000 | 0.000
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 1.000 | 1.000
Significant Unobservable Inputs (Level 3) [Member] | Valuation, Income Approach [Member] | Probability of Default [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Mortgage servicing rights, measurement input | 0.018 | 0.017
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Collateral dependent loans, measurement input | 0.000 | 0.175
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Collateral dependent loans, measurement input | 0.553 | 0.315
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Marketability Discount [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Collateral dependent loans, measurement input | 0.553 | 0.245
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Minimum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Other real estate owned, measurement input | 0.091 | (0.091)
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Maximum [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Other real estate owned, measurement input | 0.581 | 0.643
Significant Unobservable Inputs (Level 3) [Member] | Market Comparable Properties [Member] | Comparability Adjustment [Member] | Weighted Average [Member] |  |
Quantitative Information about Unobservable Inputs Used in Level 3 Fair Value Measurements [Abstract] |  |
Other real estate owned, measurement input | 0.249 | 0.128

X
- Definition This element represents the fair value disclosure of collateral dependent loan receivable as presented on the statement of financial position. + References No definition available. + Details
Name: | ctbi_CollateralDependentLoansFairValueDisclosure
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure collateral dependent loans. + References No definition available. + Details
Name: | ctbi_CollateralDependentLoansMeasurementInput
Namespace Prefix: | ctbi_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The conversion date used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
Name: | ctbi_EquitySecuritiesFvNiMeasurementInputsConversionDate
Namespace Prefix: | ctbi_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
Name: | us-gaap_EquitySecuritiesFvNi
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_EquitySecuritiesFvNiMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_FairValueInputsQuantitativeInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + Details
Name: | us-gaap_ServicingAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Value of input used to measure servicing asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_ServicingAssetMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputConversionPriceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedDividendRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=ctbi_ConversionDateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputConstantPrepaymentRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDefaultRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountForLackOfMarketabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputComparabilityAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |