Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 235	$ 387
Black-Scholes option pricing model, weighted average assumptions [Abstract]
Expected dividend yield			3.72%	3.72%
Risk-free interest rate			1.45%	1.54%
Expected volatility			30.77%	30.77%
Expected term			7 years	7 years
Weighted average fair value of options (in dollars per share)			$ 6.80	$ 6.60
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 15	$ 10	$ 28	$ 18
Unrecognized compensation expense related to unvested stock option awards	$ 200		$ 200
Unrecognized compensation expense, weighted average period			3 years 9 months 18 days
Options granted to purchase shares of CTBI common stock (in shares)	0	0	10,000	20,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 97	$ 180	$ 207	$ 369
Dividend paid on stock based compensation	9	$ 20	$ 18	$ 39
Unrecognized compensation expense, weighted average period			3 years
Unrecognized compensation expense related to restricted stock grants	$ 800		$ 800
Granted (in shares)	0	0	18,069	10,582
2015 Plan [Member] | Granted in 2016 [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
2015 Plan [Member] | Granted in 2016 [Member] | Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of certain participant employee termination events following change in control for restriction on restricted stock granted to lapse			24 months
2006 Plan [Member] | Granted in 2015 [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years