XML 44 R32.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Securities, Securities in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Securities [Abstract] |  |
Percentage of total investment with unrealized losses | 66.50% | 65.60%
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | $ 242,561 | $ 365,662
12 months or more | 164,103 | 38,763
Total | 406,664 | 404,425
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,099) | (5,586)
12 months or more | (3,874) | (1,193)
Total | (4,973) | (6,779)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 241,462 | 360,076
12 months or more | 160,229 | 37,570
Total | 401,691 | 397,646
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 143,007 | 158,732
12 months or more | 21,559 | 1,880
Total | 164,566 | 160,612
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (471) | (716)
12 months or more | (17) | (27)
Total | (488) | (743)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 142,536 | 158,016
12 months or more | 21,542 | 1,853
Total | 164,078 | 159,869
State and Political Subdivisions [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 20,141 | 53,491
12 months or more | 13,832 | 751
Total | 33,973 | 54,242
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (236) | (1,780)
12 months or more | (617) | (12)
Total | (853) | (1,792)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 19,905 | 51,711
12 months or more | 13,215 | 739
Total | 33,120 | 52,450
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 71,913 | 135,939
12 months or more | 113,712 | 31,132
Total | 185,625 | 167,071
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (336) | (2,646)
12 months or more | (2,723) | (880)
Total | (3,059) | (3,526)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 71,577 | 133,293
12 months or more | 110,989 | 30,252
Total | 182,566 | 163,545
Debt Securities [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 235,061 | 348,162
12 months or more | 149,103 | 33,763
Total | 384,164 | 381,925
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (1,043) | (5,142)
12 months or more | (3,357) | (919)
Total | (4,400) | (6,061)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 234,018 | 343,020
12 months or more | 145,746 | 32,844
Total | 379,764 | 375,864
CRA Investments Funds [Member] |  |
Available-for-sale, amortized cost [Abstract] |  |
Less than 12 months | 7,500 | 17,500
12 months or more | 15,000 | 5,000
Total | 22,500 | 22,500
Available-for-sale, gross unrealized losses [Abstract] |  |
Less than 12 months | (56) | (444)
12 months or more | (517) | (274)
Total | (573) | (718)
Available-for-sale, fair value [Abstract] |  |
Less than 12 months | 7,444 | 17,056
12 months or more | 14,483 | 4,726
Total | 21,927 | 21,782
Available-for-sale equity securities [Abstract] |  |
Fair value | 24,520 | 24,358
Gross unrealized losses | $ (573) | $ (718)
Severity of impairment in percentage of fair value less than cost | 2.30% |
CRA Investments Funds [Member] | Fixed Income Mutual Funds [Member] |  |
Available-for-sale equity securities [Abstract] |  |
Fair value | $ 24,500 |
Gross unrealized losses | $ (480) |

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 before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleEquitySecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasisAbstract
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 twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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_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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + 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_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLossesAbstract
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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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_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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
Name: | us-gaap_AvailableForSaleSecuritiesEquitySecurities
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_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_FixedIncomeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |