Leases (Details) $ in Thousands	12 Months Ended
Dec. 31, 2024 USD ($) Lease	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Finance Leases [Abstract]
Number of finance leases \| Lease	1
Finance lease cost [Abstract]
Amortization of right-of-use assets - finance leases	$ 124	$ 166
Interest on lease liabilities - finance leases	158	118
Total finance lease cost	282	284
Short-term lease cost	98	92
Operating lease cost	1,880	1,888
Total lease cost	2,260	2,264
Sublease income	(282)	(273)
Net lease cost	1,978	1,991
Supplemental Cash Flow Information Related to CTBI's Operating and Finance Lease [Abstract]
Finance lease - operating cash flows	130	128
Finance lease - financing cash flows	(0)	33	$ 24
Operating lease - operating cash flows (fixed payments)	1,893	1,889
Operating lease - operating cash flows (liability reduction)	1,495	1,455
New right-of-use assets - operating leases	0	358
New right-of-use assets - finance leases	$ 0	$ 0
Weighted average lease term - financing leases	25 years 1 month 28 days	26 years 1 month 13 days
Weighted average lease term - operating leases	13 years 1 month 17 days	13 years 2 months 12 days
Weighted average discount rate - financing leases	4.91%	4.90%
Weighted average discount rate - operating leases	3.57%	3.56%
Maturities of Operating Lease Liabilities [Abstract]
2025/2024	$ 1,790	$ 1,877
2026/2025	1,782	1,782
2027/2026	1,672	1,774
2028/2027	1,314	1,656
2029/2028	826	1,257
Thereafter	7,535	8,137
Total lease payments	14,919	16,483
Less imputed interest	(3,168)	(3,525)
Total	11,751	12,958
Maturities of Finance Lease Liabilities [Abstract]
2025/2024	157	154
2026/2025	167	159
2027/2026	174	170
2028/2027	179	174
2029/2028	183	179
Thereafter	5,887	6,070
Total lease payments	6,747	6,906
Less imputed interest	(3,308)	(3,471)
Total	$ 3,439	$ 3,435
Minimum [Member]
Operating Leases [Abstract]
Remaining lease terms	1 year
Maximum [Member]
Operating Leases [Abstract]
Remaining lease terms	45 years
Term of lease renewal	5 years

Amount of lease cost on finance lease liability.

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Amount of gross lease costs, before netting sublease income, recognized by lessee for lease contract.

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Amount of cash outflow for right-of-use assets on finance lease.

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Number of capital leases classified as finance leases for financial accounting purposes.

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Amount of cash outflow for right-of-use assets on operating lease.

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Amount of cash outflow for fixed payments on operating leases.

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Amount of cash outflow for liability reduction on operating leases.

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Amount of interest expense on finance lease liability.

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Amount of interest paid on finance lease liability.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount of lessee's undiscounted obligation for lease payments for finance lease.

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for finance lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

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Amount of cash outflow for principal payment on finance lease.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Weighted average discount rate for finance lease calculated at point in time.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of lease cost recognized by lessee for lease contract.

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of sublease income excluding finance and operating lease expense.

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