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Leases (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Lease
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Operating Leases [Abstract]        
Lease liability $ 13,826,000 $ 13,826,000   $ 0
Right-of-use asset 14,702,000 $ 14,702,000   0
Finance Leases [Abstract]        
Number of finance leases | Lease   1    
Finance lease cost [Abstract]        
Amortization of right-of-use assets - finance leases 13,000 $ 39,000    
Interest on lease liabilities - finance leases 14,000 40,000    
Total finance lease cost 27,000 79,000    
Short-term lease cost 89,000 228,000    
Operating lease cost 442,000 1,330,000    
Sublease income 63,000 194,000    
Total lease cost 495,000 1,443,000    
Supplemental Cash Flow Information Related to CTBI's Operating and Finance Lease [Abstract]        
Finance lease - operating cash flows 14,000 40,000    
Finance lease - financing cash flows 3,000 11,000 $ (0)  
Operating lease - operating cash flows (fixed payments) 408,000 1,255,000    
New right-of-use assets - operating leases $ 9,000 $ 9,000    
Weighted average lease term - financing leases 26 years 3 months 18 days 26 years 10 months 24 days    
Weighted average lease term - operating leases 14 years 1 month 6 days 14 years 3 months 18 days    
Weighted average discount rate - financing leases 3.70% 3.70%    
Weighted average discount rate - operating leases 3.45% 3.00%    
Maturities of Operating Lease Liabilities [Abstract]        
2019 $ 409,000 $ 409,000    
2020 1,655,000 1,655,000    
2021 1,671,000 1,671,000    
2022 1,657,000 1,657,000    
2023 1,578,000 1,578,000    
Thereafter 10,914,000 10,914,000    
Total lease payments 17,884,000 17,884,000    
Less imputed interest (4,058,000) (4,058,000)    
Total 13,826,000 13,826,000   0
Maturities of Finance Lease Liabilities [Abstract]        
2019 17,000 17,000    
2020 68,000 68,000    
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 2,370,000 2,370,000    
Less imputed interest (910,000) (910,000)    
Total $ 1,460,000 $ 1,460,000   0
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