Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 518	$ 548
Black-Scholes option pricing model, weighted average assumptions [Abstract]
Expected dividend yield			3.72%	3.40%
Risk-free interest rate			1.54%	2.01%
Expected volatility			30.77%	30.77%
Expected term			7 years	7 years
Weighted average fair value of options (in dollars per share)			$ 6.60	$ 7.76
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 10	$ 3	$ 29	$ 8
Unrecognized compensation expense related to unvested stock option awards	$ 200		$ 200
Unrecognized compensation expense, weighted average period			4 years 1 month 6 days
Options granted to purchase shares of CTBI common stock (in shares)	0	10,000	20,000	10,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 186	$ 202	$ 554	$ 540
Dividend paid on stock based compensation	20	$ 30	$ 59	$ 90
Unrecognized compensation expense, weighted average period			2 years
Unrecognized compensation expense related to restricted stock grants	$ 500		$ 500
Granted (in shares)	0	0	10,582	4,561
Period of restrictions on stock			4 years	4 years