Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Lease	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Finance Leases [Abstract]
Number of finance leases | Lease	1
Finance lease cost [Abstract]
Amortization of right-of-use assets - finance leases	$ 166	$ 64
Interest on lease liabilities - finance leases	118	70
Total finance lease cost	284	134
Short-term lease cost	92	85
Operating lease cost	1,888	1,838
Total lease cost	2,264	2,057
Sublease income	(273)	(249)
Net lease cost	1,991	1,808
Supplemental Cash Flow Information Related to CTBI's Operating and Finance Lease [Abstract]
Finance lease - operating cash flows	128	67
Finance lease - financing cash flows	33	24	$ 19
Operating lease - operating cash flows (fixed payments)	1,889	1,760
Operating lease - operating cash flows (liability reduction)	1,455	1,424
New right-of-use assets - operating leases	358	3,469
New right-of-use assets - finance leases	$ 0	$ 2,070
Weighted average lease term - financing leases	26 years 1 month 13 days	27 years 1 month 6 days
Weighted average lease term - operating leases	13 years 2 months 12 days	13 years 10 months 2 days
Weighted average discount rate - financing leases	4.90%	4.90%
Weighted average discount rate - operating leases	3.56%	3.55%
Maturities of Operating Lease Liabilities [Abstract]
2024/2023	$ 1,877	$ 1,878
2025/2024	1,782	1,853
2026/2025	1,774	1,748
2027/2026	1,656	1,731
2028/2027	1,257	1,620
Thereafter	8,137	9,393
Total lease payments	16,483	18,223
Less imputed interest	(3,525)	(4,063)
Total	12,958	14,160
Maturities of Finance Lease Liabilities [Abstract]
2024/2023	154	151
2025/2024	159	155
2026/2025	170	160
2027/2026	174	171
2028/2027	179	175
Thereafter	6,070	6,362
Total lease payments	6,906	7,174
Less imputed interest	(3,471)	(3,706)
Total	$ 3,435	$ 3,468
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