Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Lease	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Finance Leases [Abstract]
Number of finance leases | Lease	1
Finance lease cost [Abstract]
Amortization of right-of-use assets - finance leases	$ 64	$ 52
Interest on lease liabilities - finance leases	70	55
Total finance lease cost	134	107
Short-term lease cost	85	181
Operating lease cost	1,838	1,760
Total lease cost	2,057	2,048
Sublease income	(249)	(253)
Net lease cost	1,808	1,795
Supplemental Cash Flow Information Related to CTBI's Operating and Finance Lease [Abstract]
Finance lease - operating cash flows	67	53
Finance lease - financing cash flows	24	19	$ 15
Operating lease - operating cash flows (fixed payments)	1,760	1,693
Operating lease - operating cash flows (liability reduction)	1,424	948
New right-of-use assets - operating leases	3,469	0
New right-of-use assets - finance leases	$ 2,070	$ 0
Weighted average lease term - financing leases	27 years 1 month 6 days	24 years 7 days
Weighted average lease term - operating leases	13 years 10 months 2 days	13 years 4 months 20 days
Weighted average discount rate - financing leases	4.90%	3.70%
Weighted average discount rate - operating leases	3.55%	3.11%
Maturities of Operating Lease Liabilities [Abstract]
2023	$ 1,878
2024	1,853
2025	1,748
2026	1,731
2027	1,620
Thereafter	9,393
Total lease payments	18,223
Less imputed interest	(4,063)
Total	14,160	$ 11,583
Maturities of Finance Lease Liabilities [Abstract]
2023	151
2024	155
2025	160
2026	171
2027	175
Thereafter	6,362
Total lease payments	7,174
Less imputed interest	(3,706)
Total	$ 3,468	$ 1,422
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