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Leases (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Operating Leases [Abstract]    
Lease liability $ 15,743 $ 0
Right-of-use asset 15,128 0
Components of Lease Expense [Abstract]    
Short-term lease cost 71  
Operating lease cost 461  
Sublease income (68)  
Total lease cost 464  
Supplemental Cash Flow Information Related to CTBI's Operating Lease [Abstract]    
Operating lease - operating cash flows (fixed payments) 458  
Right-of-use assets obtained in exchange for new operating lease liabilities $ 0  
Weighted average lease term - operating leases 15 years 4 months 6 days  
Weighted average discount rate - operating leases 3.47%  
Maturities of Lease Liabilities [Abstract]    
2019 $ 1,271  
2020 1,715  
2021 1,744  
2022 1,729  
2023 1,650  
Thereafter 12,822  
Total lease payments 20,931  
Less imputed interest (5,188)  
Total $ 15,743 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 Lease Liabilities [Abstract]    
Total $ 16,100