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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Shares to be Issued and Remaining Shares Available for Future Issuance | The following table provides detail of the number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance under all of CTBI's equity compensation plans as of December 31, 2017:
Plan Category (shares in thousands) |  | Number of Shares to Be Issued Upon Exercise |  |  | Weighted Average Price |  |  | Shares Available for Future Issuance |
Equity compensation plans approved by shareholders: |  |  |  |  |  |  |  |  |
Stock options |  |  | 45 |  |  | $ | 32.26 |  |  |  | 519 | (a)
Restricted stock |  | (c) |  |  | (b) |  |  | (a) |
Performance units |  | (d) |  |  | (b) |  |  | (a) |
Stock appreciation rights (“SARs”) |  | (e) |  |  | (b) |  |  | (a) |
Total |  |  |  |  |  |  |  |  |  |  | 519 |
(a) | Under the 2015 Plan, 550,000 shares are authorized for issuance; 33,668 have been issued as of December 31, 2017. In January of 2016, 18,069 restricted stock shares were issued under the terms of the 2015 Plan pursuant to awards granted under the 2006 Plan. Additional shares will not be issued pursuant to awards granted from prior plans.
(b) | Not applicable
(c) | The maximum number of shares of restricted stock that may be granted is 550,000 shares, and the maximum that may be granted to a participant during any calendar year is 75,000 shares.
(d) | No performance units payable in stock had been issued as of December 31, 2017. The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year shall be $1,000,000.
(e) | No SARS have been issued. The maximum number of shares with respect to which SARs may be granted to a participant during any calendar year shall be 100,000 shares.
Schedule of Weighted Average Assumptions Used for Estimating Grant-Date Fair Value of Each Option Grant | CTBI uses a Black-Scholes option pricing model with the following weighted average assumptions, which are evaluated and revised as necessary, in estimating the grant-date fair value of each option grant for the year end:
| 2016 | 2015
Expected option life (in years) | 7.5 | 7.5
Expected volatility | 34.34% | 43.11%
Expected dividend yield | 3.70% | 3.72%
Risk-free interest rate | 1.45% | 1.54%
Unrecognized Compensation Cost, Grant-Date Fair Value of Shares Vested, Cash Received from Option Exercises and Actual Tax Benefit Realized for Tax Deductions from Option Exercises | The following table shows the unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the plans at December 31, 2017, 2016, and 2015 and the total grant-date fair value of shares vested, cash received from option exercises under all share-based payment arrangements, and the actual tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the years ended December 31, 2017, 2016, and 2015.
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Unrecognized compensation cost of unvested share-based compensation arrangements granted under the plan at year-end |  | $ | 1,242 |  |  | $ | 835 |  |  | $ | 495 |
Grant date fair value of shares vested for the year |  |  | 564 |  |  |  | 1,490 |  |  |  | 1,111 |
Cash received from option exercises under all share-based payment arrangements for the year |  |  | 693 |  |  |  | 2,099 |  |  |  | 1,212 |
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year |  |  | 138 |  |  |  | 3 |  |  |  | 82 |
2015 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Shares to be Issued and Remaining Shares Available for Future Issuance | The following table details the shares available for future issuance under the 2015 Plan at December 31, 2017.
Plan Category | Shares Available for Future Issuance
Shares available at January 1, 2017 | 540,131
Stock option issuances | 0
Restricted stock issuances | (23,668)
Forfeitures | 2,677
Shares available for future issuance | 519,140
Schedule of Stock Option Activity | CTBI’s stock option activity for the 2015 Plan for the years ended December 31, 2017 and 2016 is summarized as follows:
December 31 |  | 2017 |  |  | 2016 |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 10,000 |  |  | $ | 33.55 |  |  |  | 0 |  |  | $ | 0 |
Granted |  |  | 0 |  |  |  | 0 |  |  |  | 10,000 |  |  |  | 33.55 |
Exercised |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Forfeited/expired |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Outstanding at end of year |  |  | 10,000 |  |  | $ | 33.55 |  |  |  | 10,000 |  |  | $ | 33.55 |
Exercisable at end of year |  |  | 0 |  |  | $ | 0 |  |  |  | 0 |  |  | $ | 0 |
Summary for Status of Nonvested Options | A summary of the status of CTBI’s 2015 Plan for nonvested options as of December 31, 2017, and changes during the year ended December 31, 2017, is presented as follows:
Nonvested Options |  | Options |  |  | Weighted Average Grant Date Fair Value |
Nonvested at January 1, 2017 |  |  | 10,000 |  |  | $ | 6.82 |
Granted |  |  | 0 |  |  |  | 0 |
Vested |  |  | 0 |  |  |  | 0 |
Forfeited |  |  | 0 |  |  |  | 0 |
Nonvested at December 31, 2017 |  |  | 10,000 |  |  | $ | 6.82 |
Schedule of Intrinsic Values of Options Exercised, Exercisable, and Outstanding | The following table shows the intrinsic values of options exercised, exercisable, and outstanding for the 2015 Plan for the years ended December 31, 2017:
(in thousands) |  | 2017 |
Options exercised |  | $ | 0 |
Options exercisable |  |  | 0 |
Outstanding options |  |  | 136 |
Schedule of Restricted Stock Activity | The following table shows restricted stock activity for the 2015 Plan for the years ended December 31, 2017 and 2016:
December 31 |  | 2017 |  |  | 2016 |
|  | Grants |  |  | Weighted Average Fair Value at Grant |  |  | Grants |  |  | Weighted Average Fair Value at Grant |
Outstanding at beginning of year |  |  | 17,496 |  |  | $ | 33.55 |  |  |  | 0 |  |  | $ | 0 |
Granted* |  |  | 23,668 |  |  |  | 46.45 |  |  |  | 18,069 |  |  |  | 33.55 |
Vested |  |  | (5,751 | ) |  |  | 35.79 |  |  |  | (442 | ) |  |  | 33.55 |
Forfeited |  |  | (2,328 | ) |  |  | 41.31 |  |  |  | (131 | ) |  |  | 33.55 |
Outstanding at end of year |  |  | 33,085 |  |  | $ | 41.84 |  |  |  | 17,496 |  |  | $ | 33.55 |
* Grants issued in 2016 were issued under the terms of the 2015 Plan pursuant to awards granted and earned under the 2006 Plan.
2006 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Stock Option Activity | CTBI’s stock option activity for the 2006 Plan for the years ended December 31, 2017, 2016, and 2015 is summarized as follows:
December 31 |  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 61,041 |  |  | $ | 29.84 |  |  |  | 118,574 |  |  | $ | 32.36 |  |  |  | 98,821 |  |  | $ | 32.35 |
Granted |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 20,000 |  |  |  | 32.27 |
Exercised |  |  | (25,665 | ) |  |  | 27.01 |  |  |  | (57,423 | ) |  |  | 35.02 |  |  |  | (247 | ) |  |  | 24.12 |
Forfeited/expired |  |  | 0 |  |  |  | 0 |  |  |  | (110 | ) |  |  | 35.41 |  |  |  | 0 |  |  |  | 0 |
Outstanding at end of year |  |  | 35,376 |  |  | $ | 31.90 |  |  |  | 61,041 |  |  | $ | 29.84 |  |  |  | 118,574 |  |  | $ | 32.36 |
Exercisable at end of year |  |  | 5,376 |  |  | $ | 25.22 |  |  |  | 30,629 |  |  | $ | 26.64 |  |  |  | 87,749 |  |  | $ | 32.12 |
Summary for Status of Nonvested Options | A summary of the status of CTBI’s 2006 Plan for nonvested options as of December 31, 2017, and changes during the year ended December 31, 2017, is presented as follows:
Nonvested Options |  | Options |  |  | Weighted Average Grant Date Fair Value |
Nonvested at January 1, 2017 |  |  | 30,412 |  |  | $ | 7.00 |
Granted |  |  | 0 |  |  |  | 0 |
Vested |  |  | (412 | ) |  |  | 8.23 |
Forfeited |  |  | 0 |  |  |  | 0 |
Nonvested at December 31, 2017 |  |  | 30,000 |  |  | $ | 6.98 |
Schedule of Intrinsic Values of Options Exercised, Exercisable, and Outstanding | The following table shows the intrinsic values of options exercised, exercisable, and outstanding for the 2006 Plan for the years ended December 31, 2017, 2016, and 2015:
(in thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Options exercised |  | $ | 537 |  |  | $ | 139 |  |  | $ | 3 |
Options exercisable |  |  | 118 |  |  |  | 703 |  |  |  | 275 |
Outstanding options |  |  | 538 |  |  |  | 1,206 |  |  |  | 334 |
Schedule of Restricted Stock Activity | The following table shows restricted stock activity for the years ended December 31, 2017, 2016, and 2015:
December 31 |  | 2017 |  |  | 2016 |  |  | 2015 |
|  | Grants |  |  | Weighted Average Fair Value at Grant |  |  | Grants |  |  | Weighted Average Fair Value at Grant |  |  | Grants |  |  | Weighted Average Fair Value at Grant |
Outstanding at beginning of year |  |  | 11,989 |  |  | $ | 32.85 |  |  |  | 64,735 |  |  | $ | 28.92 |  |  |  | 101,309 |  |  | $ | 26.19 |
Granted |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 10,582 |  |  |  | 32.27 |
Vested |  |  | (6,214 | ) |  |  | 32.48 |  |  |  | (52,521 | ) |  |  | 28.01 |  |  |  | (46,482 | ) |  |  | 23.66 |
Forfeited |  |  | (349 | ) |  |  | 33.31 |  |  |  | (225 | ) |  |  | 32.52 |  |  |  | (674 | ) |  |  | 33.31 |
Outstanding at end of year |  |  | 5,426 |  |  | $ | 33.24 |  |  |  | 11,989 |  |  | $ | 32.85 |  |  |  | 64,735 |  |  | $ | 28.92 |
1998 Plan [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Stock Option Activity | CTBI’s stock option activity for the 1998 Plan for the years ended December 31, 2016 and 2015 is summarized as follows:
December 31 |  | 2016 |  |  | 2015 |
|  | Options |  |  | Weighted Average Exercise Price |  |  | Options |  |  | Weighted Average Exercise Price |
Outstanding at beginning of year |  |  | 2,980 |  |  | $ | 29.49 |  |  |  | 43,960 |  |  | $ | 29.43 |
Granted |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Exercised |  |  | (2,980 | ) |  |  | 29.49 |  |  |  | (40,980 | ) |  |  | 29.42 |
Forfeited/expired |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Outstanding at end of year |  |  | 0 |  |  | $ | 0 |  |  |  | 2,980 |  |  | $ | 29.49 |
Exercisable at end of year |  |  | 0 |  |  | $ | 0 |  |  |  | 2,980 |  |  | $ | 29.49 |
Schedule of Intrinsic Values of Options Exercised, Exercisable, and Outstanding | The following table shows the intrinsic values of options exercised, exercisable, and outstanding for the 1998 Plan for the years ended December 31, 2016 and 2015:
(in thousands) |  | 2016 |  |  | 2015 |
Options exercised |  | $ | 13 |  |  | $ | 241 |
Options exercisable |  |  | 0 |  |  |  | 16 |
Outstanding options |  |  | 0 |  |  |  | 16 |

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