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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Stock-based Compensation [Abstract] |  |  |  |
Stock based compensation expense |  |  | $ 400 | $ 302
Stock Options [Member] |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |
Stock based compensation expense | $ 10 | $ 14 | 63 | $ 28
Unrecognized compensation expense related to unvested stock option awards | 100 |  | $ 100 |
Unrecognized compensation expense, weighted average period |  |  | 1 year 4 months 24 days |
Options granted to purchase shares of CTBI common stock (in shares) |  |  | 0 | 0
Restricted Stock [Member] |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |
Stock based compensation expense | 154 | 142 | $ 337 | $ 274
Dividend paid on stock based compensation | 13 | $ 13 | 25 | $ 27
Unrecognized compensation expense related to restricted stock grants | $ 1,400 |  | $ 1,400 |
Unrecognized compensation expense, weighted average period |  |  | 2 years 9 months 18 days |
Granted (in shares) | 0 | 0 | 11,320 | 23,668
2015 Plan [Member] | Restricted Stock [Member] |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |
Award vesting period |  |  | 4 years |
2015 Plan [Member] | Restricted Stock [Member] | Maximum [Member] |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |
Period of certain participant employee termination events following change in control for restriction on restricted stock granted to lapse |  |  | 24 months |
2015 Plan [Member] | Granted In 2017 [Member] | Restricted Stock [Member] |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |
Granted (in shares) |  |  | 5,000 |
Award vesting period |  |  | 5 years |

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- Definition Refers to the period of certain participant employee termination events following a change in control of the entity for the restriction on restricted stock granted to lapse, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of paid and unpaid stock dividends declared and applicable to holders of share-based compensation, for example, but not limited to, non-vested shares, stock options, or restricted stock units. + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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