XML 47 R35.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | $ 736 | $ 1,391 | $ 736 | $ 1,391 | $ 991
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 46,883 | 46,199 | 46,883 | 46,199 | 47,412
Unpaid Contractual Principal Balance |  | 51,693 | 49,740 | 51,693 | 49,740 | 52,212
Specific Allowance |  | 736 | 1,391 | 736 | 1,391 | 991
Average Investment in Impaired Loans |  | 45,825 | 46,629 | 47,274 | 49,684 | 49,343
Interest Income Recognized | [1] | 521 | 460 | 1,647 | 1,550 | 2,127
Commercial [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 2,804 | 4,613 | 2,804 | 4,613 | 4,431
Unpaid Contractual Principal Balance |  | 2,804 | 4,621 | 2,804 | 4,621 | 4,439
Average Investment in Impaired Loans |  | 2,865 | 4,662 | 3,795 | 4,955 | 4,835
Interest Income Recognized | [1] | 26 | 50 | 132 | 136 | 200
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  |  | 153 |  | 153 | 153
Unpaid Contractual Principal Balance |  |  | 174 |  | 174 | 173
Specific Allowance |  | 0 | 25 | 0 | 25 | 25
Average Investment in Impaired Loans |  |  | 153 |  | 156 | 155
Interest Income Recognized | [1] |  | 0 |  | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 2,804 | 4,766 | 2,804 | 4,766 | 4,584
Unpaid Contractual Principal Balance |  | 2,804 | 4,795 | 2,804 | 4,795 | 4,612
Specific Allowance |  | 0 | 25 | 0 | 25 | 25
Average Investment in Impaired Loans |  | 2,865 | 4,815 | 3,795 | 5,111 | 4,990
Interest Income Recognized | [1] | 26 | 50 | 132 | 136 | 200
Commercial [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 31,632 | 25,322 | 31,632 | 25,322 | 28,480
Unpaid Contractual Principal Balance |  | 33,538 | 25,916 | 33,538 | 25,916 | 30,365
Average Investment in Impaired Loans |  | 30,216 | 25,452 | 30,588 | 27,318 | 27,753
Interest Income Recognized | [1] | 349 | 276 | 1,073 | 980 | 1,344
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,980 | 3,918 | 1,980 | 3,918 | 2,985
Unpaid Contractual Principal Balance |  | 3,116 | 5,023 | 3,116 | 5,023 | 4,095
Specific Allowance |  | 641 | 1,301 | 641 | 1,301 | 966
Average Investment in Impaired Loans |  | 2,005 | 3,984 | 2,112 | 4,236 | 3,932
Interest Income Recognized | [1] | 0 | 3 | 1 | 8 | 8
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 33,612 | 29,240 | 33,612 | 29,240 | 31,465
Unpaid Contractual Principal Balance |  | 36,654 | 30,939 | 36,654 | 30,939 | 34,460
Specific Allowance |  | 641 | 1,301 | 641 | 1,301 | 966
Average Investment in Impaired Loans |  | 32,221 | 29,436 | 32,700 | 31,554 | 31,685
Interest Income Recognized | [1] | 349 | 279 | 1,074 | 988 | 1,352
Commercial [Member] | Equipment Lease Financing [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  |  |  |  |  | 0
Unpaid Contractual Principal Balance |  |  |  |  |  | 0
Average Investment in Impaired Loans |  |  | 0 |  | 45 | 34
Interest Income Recognized | [1] |  | 0 |  | 0 | 0
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  |  |  |  |  | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  |  |  |  |  | 0
Unpaid Contractual Principal Balance |  |  |  |  |  | 0
Specific Allowance |  |  |  |  |  | 0
Average Investment in Impaired Loans |  |  | 0 |  | 45 | 34
Interest Income Recognized | [1] |  | 0 |  | 0 | 0
Commercial [Member] | Other [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 8,268 | 9,994 | 8,268 | 9,994 | 9,481
Unpaid Contractual Principal Balance |  | 10,034 | 11,804 | 10,034 | 11,804 | 11,252
Average Investment in Impaired Loans |  | 8,518 | 10,191 | 8,857 | 10,717 | 10,444
Interest Income Recognized | [1] | 125 | 123 | 405 | 396 | 539
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 321 | 130 | 321 | 130 | 0
Unpaid Contractual Principal Balance |  | 321 | 133 | 321 | 133 | 0
Specific Allowance |  | 95 | 65 | 95 | 65 | 0
Average Investment in Impaired Loans |  | 339 | 130 | 220 | 87 | 65
Interest Income Recognized | [1] | 8 | 0 | 12 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 8,589 | 10,124 | 8,589 | 10,124 | 9,481
Unpaid Contractual Principal Balance |  | 10,355 | 11,937 | 10,355 | 11,937 | 11,252
Specific Allowance |  | 95 | 65 | 95 | 65 | 0
Average Investment in Impaired Loans |  | 8,857 | 10,321 | 9,077 | 10,804 | 10,509
Interest Income Recognized | [1] | 133 | 123 | 417 | 396 | 539
Residential [Member] | Construction [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  |  | 873 |  | 873 | 318
Unpaid Contractual Principal Balance |  |  | 873 |  | 873 | 318
Average Investment in Impaired Loans |  | 0 | 860 | 106 | 569 | 534
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  |  | 0 |  | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  |  | 873 |  | 873 | 318
Unpaid Contractual Principal Balance |  |  | 873 |  | 873 | 318
Specific Allowance |  |  | 0 |  | 0 | 0
Average Investment in Impaired Loans |  | 0 | 860 | 106 | 569 | 534
Interest Income Recognized | [1] | 0 | 0 | 0 | 0 | 0
Residential [Member] | Real Estate [Member] |  |  |  |  |  |
Loans without a specific valuation allowance [Abstract] |  |  |  |  |  |
Recorded Balance |  | 1,878 | 1,196 | 1,878 | 1,196 | 1,564
Unpaid Contractual Principal Balance |  | 1,880 | 1,196 | 1,880 | 1,196 | 1,570
Average Investment in Impaired Loans |  | 1,882 | 1,197 | 1,596 | 1,601 | 1,591
Interest Income Recognized | [1] | 13 | 8 | 24 | 30 | 36
Loans with a specific valuation allowance [Abstract] |  |  |  |  |  |
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Total impaired loans [Abstract] |  |  |  |  |  |
Recorded balance |  | 1,878 | 1,196 | 1,878 | 1,196 | 1,564
Unpaid Contractual Principal Balance |  | 1,880 | 1,196 | 1,880 | 1,196 | 1,570
Specific Allowance |  | 0 | 0 | 0 | 0 | 0
Average Investment in Impaired Loans |  | 1,882 | 1,197 | 1,596 | 1,601 | 1,591
Interest Income Recognized | [1] | $ 13 | $ 8 | $ 24 | $ 30 | $ 36
[1] | Cash basis interest is substantially the same as interest income recognized.

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

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

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

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ctbi_EquipmentLeaseFinancingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ctbi_CommercialOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |