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Leases (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Lease
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Operating Leases [Abstract]        
Lease liability $ 14,081,000 $ 14,081,000    
Right-of-use asset 15,028,000 $ 15,028,000   $ 0
Finance Leases [Abstract]        
Number of finance leases | Lease   1    
Finance lease cost [Abstract]        
Amortization of right-of-use assets - finance leases 9,000 $ 17,000    
Interest on lease liabilities - finance leases 13,000 27,000    
Total finance lease cost 22,000 44,000    
Short-term lease cost 68,000 139,000    
Operating lease cost 442,000 888,000    
Sublease income 63,000 131,000    
Total lease cost 469,000 940,000    
Supplemental Cash Flow Information Related to CTBI's Operating and Finance Lease [Abstract]        
Finance lease - operating cash flows 13,000 27,000    
Finance lease - financing cash flows 4,000 7,000 $ (0)  
Operating lease - operating cash flows (fixed payments) $ 407,000 $ 848,000    
Weighted average lease term - financing leases 26 years 6 months 26 years 11 months 1 day    
Weighted average lease term - operating leases 14 years 2 months 1 day 14 years 4 months 2 days    
Weighted average discount rate - financing leases 3.70% 3.70%    
Weighted average discount rate - operating leases 3.26% 3.00%    
Maturities of Operating Lease Liabilities [Abstract]        
2019 $ 813,000 $ 813,000    
2020 1,647,000 1,647,000    
2021 1,668,000 1,668,000    
2022 1,654,000 1,654,000    
2023 1,575,000 1,575,000    
Thereafter 10,895,000 10,895,000    
Total lease payments 18,252,000 18,252,000    
Less imputed interest (4,171,000) (4,171,000)    
Total 14,081,000 14,081,000    
Maturities of Finance Lease Liabilities [Abstract]        
2019 34,000 34,000    
2020 67,000 67,000    
2021 75,000 75,000    
2022 75,000 75,000    
2023 75,000 75,000    
Thereafter 2,060,000 2,060,000    
Total lease payments 2,386,000 2,386,000    
Less imputed interest (923,000) (923,000)    
Total $ 1,463,000 $ 1,463,000    
Minimum Non-cancellable Rental Payments [Abstract]        
2019       1,999,000
2020       1,710,000
2021       1,737,000
2022       1,760,000
2023       1,696,000
Thereafter       13,031,000
Total       $ 21,933,000
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 5 years    
ASU 2016-02 [Member]        
Operating Leases [Abstract]        
Lease liability $ 16,100,000 $ 16,100,000    
Right-of-use asset 15,500,000 15,500,000    
Cumulative-effect adjustment to retained earnings   500,000    
Adjustment to deferred tax liability 100,000 100,000    
Maturities of Operating Lease Liabilities [Abstract]        
Total $ 16,100,000 $ 16,100,000