Leases (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) Lease	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Finance Leases [Abstract]
Number of finance leases \| Lease	1
Finance lease cost [Abstract]
Amortization of right-of-use assets - finance leases	$ 52	$ 50
Interest on lease liabilities - finance leases	55	53
Total finance lease cost	107	103
Short-term lease cost	181	294
Operating lease cost	1,760	1,769
Sublease income	253	253
Total lease cost	1,795	1,913
Supplemental Cash Flow Information Related to CTBI's Operating and Finance Lease [Abstract]
Finance lease - operating cash flows	53	53
Finance lease - financing cash flows	19	15	$ 14
Operating lease - operating cash flows (fixed payments)	1,693	1,682
Operating lease - operating cash flows (liability reduction)	948	1,198
New right-of-use assets - operating leases	$ 0	$ 0
Weighted average lease term - financing leases	24 years 7 days	25 years 7 days
Weighted average lease term - operating leases	13 years 4 months 20 days	13 years 5 months 15 days
Weighted average discount rate - financing leases	3.70%	3.70%
Weighted average discount rate - operating leases	3.11%	3.43%
Maturities of Operating Lease Liabilities [Abstract]
2022/ 2021	$ 1,723	$ 1,717
2023/ 2022	1,634	1,703
2024/ 2023	1,313	1,626
2025/ 2024	1,121	1,313
2026/ 2025	1,078	1,121
Thereafter	7,459	8,528
Total lease payments	14,328	16,008
Less imputed interest	(2,745)	(3,477)
Total	11,583	12,531
Maturities of Finance Lease Liabilities [Abstract]
2022/ 2021	75	75
2023/ 2022	75	75
2024/ 2023	75	75
2025/ 2024	75	75
2026/ 2025	82	75
Thereafter	1,830	1,913
Total lease payments	2,212	2,288
Less imputed interest	(790)	(847)
Total	$ 1,422	$ 1,441
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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Weighted average remaining leases 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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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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Weighted average discount rate for operating lease during the period.

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

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Amount of interest expense 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 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 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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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 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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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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