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Leases (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Lease
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Operating Leases [Abstract]      
Lease liability $ 13,729 $ 0  
Right-of-use asset $ 14,550 0  
Finance Leases [Abstract]      
Number of finance leases | Lease 1    
Finance lease cost [Abstract]      
Amortization of right-of-use assets - finance leases $ 52    
Interest on lease liabilities - finance leases 54    
Total finance lease cost 106    
Short-term lease cost 306    
Operating lease cost 1,773    
Sublease income 257    
Total lease cost 1,928    
Supplemental Cash Flow Information Related to CTBI's Operating and Finance Lease [Abstract]      
Finance lease - operating cash flows 54    
Finance lease - financing cash flows 14 (0) $ (0)
Operating lease - operating cash flows (fixed payments) 1,665    
New right-of-use assets - operating leases 9    
New right-of-use assets - financing leases $ 0    
Weighted average lease term - financing leases 26 years 7 days    
Weighted average lease term - operating leases 13 years 10 months 2 days    
Weighted average discount rate - financing leases 3.70%    
Weighted average discount rate - operating leases 3.45%    
Maturities of Operating Lease Liabilities [Abstract]      
2019 $ 1,677    
2020 1,710    
2021 1,703    
2022 1,626    
2023 1,313    
Thereafter 9,654    
Total lease payments 17,683    
Less imputed interest (3,954)    
Total 13,729 0  
Maturities of Finance Lease Liabilities [Abstract]      
2019 68    
2020 75    
2021 75    
2022 75    
2023 75    
Thereafter 1,985    
Total lease payments 2,353    
Less imputed interest (897)    
Total 1,456 $ 0  
Minimum Non-cancellable Rental Payments [Abstract]      
2019 1,999    
2020 1,710    
2021 1,737    
2022 1,760    
2023 1,696    
Thereafter 13,031    
Total $ 21,933    
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    
ASU 2016-02 [Member]      
Operating Leases [Abstract]      
Lease liability $ 16,100    
Right-of-use asset 15,500    
Cumulative-effect adjustment to retained earnings 500    
Adjustment to deferred tax liability 100    
Maturities of Operating Lease Liabilities [Abstract]      
Total $ 16,100