Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jan. 31, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Stock-based Compensation [Abstract]
Stock based compensation expense				$ 947	$ 687
Restricted stock activity, grants [Roll Forward]
Outstanding at beginning of year (in shares)		99,612	87,323	86,572	96,840
Granted (in shares)		0	0	38,538	15,000
Vested (in shares)		(2,608)	(423)	(28,106)	(22,831)
Forfeited (in shares)		(5,562)	(328)	(5,562)	(2,437)
Outstanding at end of year (in shares)		91,442	86,572	91,442	86,572
Restricted stock activity, weighted average fair value at grant [Roll Forward]
Outstanding at beginning of year (in dollars per share)		$ 47.27	$ 43.45	$ 43.45	$ 43.75
Granted (in dollars per share)		0	0	53.53	41.29
Vested (in dollars per share)		47.6	43.32	44.11	43.37
Forfeited (in dollars per share)		46.76	43.32	46.76	42.87
Outstanding at end of year (in dollars per share)		$ 47.29	$ 43.45	$ 47.29	$ 43.45
Restricted Stock [Member]
Stock-based Compensation [Abstract]
Stock based compensation expense		$ 403	$ 344	$ 947	$ 687
Dividend paid on stock based compensation		43	40	90	$ 80
Unrecognized compensation expense related to restricted stock grants		3,200		$ 3,200
Unrecognized compensation expense, weighted average period				2 years 10 months 24 days
Stock Options [Member]
Stock-based Compensation [Abstract]
Stock based compensation expense		0	$ 0
Unrecognized compensation expense related to unvested stock option awards		$ 0		$ 0
Options granted to purchase shares of CTBI common stock (in shares)		0	0
Management Retention Restricted Stock Award [Member]
Stock-based Compensation [Abstract]
Award vesting period				5 years
Stock Ownership Incentive Plan [Member] | Restricted Stock [Member]
Stock-based Compensation [Abstract]
Award vesting period				4 years
Stock Ownership Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member]
Stock-based Compensation [Abstract]
Period of certain participant employee termination events following change in control for restriction on restricted stock granted to lapse				24 months
Stock Ownership Incentive Plan [Member] | Management Retention Restricted Stock Award [Member]
Restricted stock activity, grants [Roll Forward]
Granted (in shares)	5,000