Refers to the period of certain participant employee termination events following a change in control of the entity for the restriction on restricted stock granted to lapse, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2023
Stock-based Compensation [Abstract]
Stock based compensation expense				$ 1,346	$ 1,021
Restricted stock activity, grants [Roll Forward]
Outstanding at beginning of period (in shares)		91,442	86,572	86,572	96,840
Granted (in shares)		0	0	38,538	15,000
Vested (in shares)		0	0	(28,106)	(22,831)
Forfeited (in shares)		(315)	0	(5,877)	(2,437)
Outstanding at end of period (in shares)		91,127	86,572	91,127	86,572
Restricted stock activity, weighted average fair value at grant [Roll Forward]
Outstanding at beginning of year (in dollars per share)		$ 47.29	$ 43.45	$ 43.45	$ 43.75
Granted (in dollars per share)		0	0	53.53	41.29
Vested (in dollars per share)		0	0	44.11	43.37
Forfeited (in dollars per share)		51.29	0	47	42.87
Outstanding at end of year (in dollars per share)		$ 47.28	$ 43.45	$ 47.28	$ 43.45
Restricted Stock [Member]
Stock-based Compensation [Abstract]
Stock based compensation expense		$ 399	$ 293	$ 1,300	$ 1,000
Dividend paid on stock based compensation		48	41	138	121
Unrecognized compensation expense related to restricted stock grants		2,900		$ 2,900
Unrecognized compensation expense, weighted average period				2 years 9 months 18 days
Stock Options [Member]
Stock-based Compensation [Abstract]
Stock based compensation expense		0	$ 0	$ 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
Stock options outstanding (in shares)						20,000
Stock options exercised (in shares)			20,000
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