Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 335,000	$ 294,000
Dividend paid on stock based compensation	31,000	30,000	62,000	60,000
Options granted to purchase shares of CTBI common stock (in shares)	0	0	1,500	0
Black-Scholes option pricing model, weighted average assumptions [Abstract]
Expected dividend yield (in hundredths)			3.74%
Risk-free interest rate (in hundredths)			1.33%
Expected volatility (in hundredths)			39.11%
Expected term (in years)			7 years 6 months
Weighted average fair value of options granted (dollars per share)			$ 9.05
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	2,000	20,000	5,000	39,000
Unrecognized compensation expense related to unvested stock option awards	15,000		15,000
Unrecognized compensation expense, weighted average period			1 year 6 months
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	169,000	158,000	330,000	316,000
Unrecognized compensation expense, weighted average period			1 year 4 months 24 days
Unrecognized compensation expense related to restricted stock grants	$ 1,200,000		$ 1,200,000
Granted (in shares)	0	0	10,822	331
Period of restrictions on stock			4 years	4 years