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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2023
Stock-based Compensation [Abstract] |  |  |  |  |  |
Stock based compensation expense |  |  |  | $ 1,346 | $ 1,021 |
Restricted stock activity, grants [Roll Forward] |  |  |  |  |  |
Outstanding at beginning of period (in shares) |  | 91,442 | 86,572 | 86,572 | 96,840 |
Granted (in shares) |  | 0 | 0 | 38,538 | 15,000 |
Vested (in shares) |  | 0 | 0 | (28,106) | (22,831) |
Forfeited (in shares) |  | (315) | 0 | (5,877) | (2,437) |
Outstanding at end of period (in shares) |  | 91,127 | 86,572 | 91,127 | 86,572 |
Restricted stock activity, weighted average fair value at grant [Roll Forward] |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) |  | $ 47.29 | $ 43.45 | $ 43.45 | $ 43.75 |
Granted (in dollars per share) |  | 0 | 0 | 53.53 | 41.29 |
Vested (in dollars per share) |  | 0 | 0 | 44.11 | 43.37 |
Forfeited (in dollars per share) |  | 51.29 | 0 | 47 | 42.87 |
Outstanding at end of year (in dollars per share) |  | $ 47.28 | $ 43.45 | $ 47.28 | $ 43.45 |
Restricted Stock [Member] |  |  |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |  |  |
Stock based compensation expense |  | $ 399 | $ 293 | $ 1,300 | $ 1,000 |
Dividend paid on stock based compensation |  | 48 | 41 | 138 | 121 |
Unrecognized compensation expense related to restricted stock grants |  | 2,900 |  | $ 2,900 |  |
Unrecognized compensation expense, weighted average period |  |  |  | 2 years 9 months 18 days |  |
Stock Options [Member] |  |  |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |  |  |
Stock based compensation expense |  | 0 | $ 0 | $ 0 | $ 0 |
Unrecognized compensation expense related to unvested stock option awards |  | $ 0 |  | $ 0 |  |
Options granted to purchase shares of CTBI common stock (in shares) |  | 0 |  | 0 |  |
Stock options outstanding (in shares) |  |  |  |  |  | 20,000
Stock options exercised (in shares) |  |  | 20,000 |  |  |
Management Retention Restricted Stock Award [Member] |  |  |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |  |  |
Award vesting period |  |  |  | 5 years |  |
Stock Ownership Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |
Stock-based Compensation [Abstract] |  |  |  |  |  |
Award vesting period |  |  |  | 4 years |  |
Stock Ownership Incentive 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 |  |
Stock Ownership Incentive Plan [Member] | Management Retention Restricted Stock Award [Member] |  |  |  |  |  |
Restricted stock activity, grants [Roll Forward] |  |  |  |  |  |
Granted (in shares) | 5,000 |  |  |  |  |

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- Definition Amount of paid and unpaid stock dividends declared for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-4 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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