Stock-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 548,000	$ 498,000
Dividend paid on stock based compensation	30,000	31,000	90,000	93,000
Options granted to purchase shares of CTBI common stock (in shares)	10,000	0	10,000	1,650
Black-Scholes option pricing model, weighted average assumptions [Abstract]
Expected dividend yield (in hundredths)			3.40%	3.74%
Risk-free interest rate (in hundredths)			2.01%	1.33%
Expected volatility (in hundredths)			30.77%	39.11%
Expected term (in years)			7 years	7 years 6 months
Weighted average fair value of options (in dollars per share)			$ 7.76	$ 8.23
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	3,000	2,000	8,000	7,000
Unrecognized compensation expense related to unvested stock option awards	77,000		77,000
Unrecognized compensation expense, weighted average period			4 years 6 months
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	202,000	161,000	540,000	491,000
Unrecognized compensation expense, weighted average period			1 year 6 months
Unrecognized compensation expense related to restricted stock grants	$ 1,000,000		$ 1,000,000
Granted (in shares)	0	0	4,572	11,904
Period of restrictions on stock			4 years	4 years