Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense			$ 302	$ 235
Black-Scholes option pricing model, weighted average assumptions [Abstract]
Expected dividend yield				3.70%
Risk-free interest rate				1.45%
Expected volatility				34.34%
Expected term				7 years 6 months
Weighted average fair value of options (in dollars per share)				$ 6.82
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 14	$ 15	28	$ 28
Unrecognized compensation expense related to unvested stock option awards	100		$ 100
Unrecognized compensation expense, weighted average period			2 years 9 months 18 days
Options granted to purchase shares of CTBI common stock (in shares)			0	10,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	142	97	$ 274	$ 207
Dividend paid on stock based compensation	13	$ 9	$ 27	$ 18
Unrecognized compensation expense, weighted average period			3 years 3 months 18 days
Unrecognized compensation expense related to restricted stock grants	$ 1,500		$ 1,500
Granted (in shares)	0	0	23,668	18,069
2015 Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
2015 Plan [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
2015 Plan [Member] | Granted In 2017 [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			5,000
Award vesting period			5 years