XML 74 R59.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 75.70% | 69.50%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 163,059 | $ 241,239
12 months or more | 297,524 | 173,642
Total | 460,583 | 414,881
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (848) | (2,004)
12 months or more | (8,598) | (5,054)
Total | (9,446) | (7,058)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 162,211 | 239,235
12 months or more | 288,926 | 168,588
Total | 451,137 | 407,823
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 78,905 | 136,688
12 months or more | 97,955 | 23,885
Total | 176,860 | 160,573
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (271) | (840)
12 months or more | (1,197) | (332)
Total | (1,468) | (1,172)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 78,634 | 135,848
12 months or more | 96,758 | 23,553
Total | 175,392 | 159,401
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 21,707 | 34,283
12 months or more | 51,911 | 16,930
Total | 73,618 | 51,213
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (194) | (416)
12 months or more | (2,231) | (745)
Total | (2,425) | (1,161)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 21,513 | 33,867
12 months or more | 49,680 | 16,185
Total | 71,193 | 50,052
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 61,940 | 62,768
12 months or more | 147,658 | 117,827
Total | 209,598 | 180,595
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (377) | (643)
12 months or more | (5,170) | (3,364)
Total | (5,547) | (4,007)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 61,563 | 62,125
12 months or more | 142,488 | 114,463
Total | 204,051 | 176,588
Other Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 507 | 0
12 months or more | 0 | 0
Total | 507 | 0
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (6) | 0
12 months or more | 0 | 0
Total | (6) | 0
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 501 | 0
12 months or more | 0 | 0
Total | $ 501 | 0
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months |  | 233,739
12 months or more |  | 158,642
Total |  | 392,381
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months |  | (1,899)
12 months or more |  | (4,441)
Total |  | (6,340)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months |  | 231,840
12 months or more |  | 154,201
Total |  | 386,041
CRA Investment Funds [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months |  | 7,500
12 months or more |  | 15,000
Total |  | 22,500
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months |  | (105)
12 months or more |  | (613)
Total |  | (718)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months |  | 7,395
12 months or more |  | 14,387
Total |  | $ 21,782
Severity of impairment in percentage of fair value less than cost | 2.90% |

X
- Definition This item represents the aggregate amortized cost of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAmortizedCost
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition This item represents the aggregate amortized cost of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
Name: | ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsAmortizedCost
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate amortized cost of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
Name: | ctbi_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerAmortizedCost
Namespace Prefix: | ctbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of total investment with unrealized losses. + References No definition available. + Details
Name: | ctbi_PercentageOfTotalInvestmentWithUnrealizedLosses
Namespace Prefix: | ctbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Refers to the severity of impairment in percentage of fair value less than cost. + References No definition available. + Details
Name: | ctbi_SeverityOfImpairmentInPercentageOfFairValueLessThanCost
Namespace Prefix: | ctbi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

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

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