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Securities (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Available-for-Sale [Abstract]      
Amortized Cost $ 656,335,000   $ 621,753,000
Gross Unrealized Gains 5,795,000   6,457,000
Gross Unrealized Losses (12,003,000)   (18,805,000)
Fair Value 650,127,000   609,405,000
Held-to-Maturity [Abstract]      
Amortized Cost 1,662,000   1,662,000
Gross Unrealized Gains 1,000   1,000
Gross Unrealized Losses (44,000)   (62,000)
Fair Value 1,619,000   1,601,000
Available-for-Sale, Amortized Cost [Abstract]      
Due in one year or less 2,366,000    
Due after one through five years 104,520,000    
Due after five through ten years 123,723,000    
Due after ten years 39,399,000    
U.S. government sponsored agency mortgage-backed securities 361,327,000    
Total debt securities 631,335,000    
Marketable equity securities 25,000,000    
Total securities 656,335,000    
Available-for-Sale, Fair Value [Abstract]      
Due in one year or less 2,377,000    
Due after one through five years 104,901,000    
Due after five through ten years 120,778,000    
Due after ten years 38,993,000    
U.S. government sponsored agency mortgage-backed securities 358,651,000    
Total debt securities 625,700,000    
Marketable equity securities 24,427,000    
Total securities 650,127,000    
Held-to-Maturity, Amortized Cost [Abstract]      
Due in one year or less 0    
Due after one through five years 0    
Due after five through ten years 1,182,000    
Due after ten years 480,000    
U.S. government sponsored agency mortgage-backed securities 0    
Total debt securities 1,662,000    
Marketable equity securities 0    
Total securities 1,662,000    
Held-to-Maturity, Fair Value [Abstract]      
Due in one year or less 0    
Due after one through five years 0    
Due after five through ten years 1,183,000    
Due after ten years 436,000    
U.S. government sponsored agency mortgage-backed securities 0    
Total debt securities 1,619,000    
Marketable equity securities 0    
Total securities 1,619,000    
Securities gains (loss), net (60,000) 0  
Realized pre-tax gain on sale of securities 1,800,000 0  
Realized pre-tax loss on sale of securities 1,900,000 0  
Securities pledged as collateral to secure public deposit and for other purposes 236,000,000   257,500,000
Amortized cost of securities sold under agreements to repurchase 254,600,000   255,400,000
Percentage of total investment with unrealized losses (in hundredths) 65.70%   67.80%
CTBI fixed income mutual funds of total fair value 24,400,000    
CTBI fixed income mutual funds of total unrealized losses 573,000    
Percentage Severity of the impairment in fair value less than cost (in hundredths) 2.30%    
Duration of the impairment maximum 12 months    
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 394,809,000   382,620,000
12 Months or More 45,042,000   49,968,000
Total 439,851,000   432,588,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (9,217,000)   (14,806,000)
12 Months or More (2,786,000)   (3,999,000)
Total (12,003,000)   (18,805,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 385,592,000   367,814,000
12 Months or More 42,256,000   45,969,000
Total 427,848,000   413,783,000
Held-to-Maturity, Amortized Cost [Abstract]      
12 Months or More 480,000   480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract]      
12 Months or More (44,000)   (62,000)
Held-to-Maturity, Fair Value [Abstract]      
12 Months or More 436,000   418,000
U.S. Treasury and government agencies [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 140,033,000   65,524,000
Gross Unrealized Gains 229,000   225,000
Gross Unrealized Losses (3,783,000)   (5,139,000)
Fair Value 136,479,000   60,610,000
Held-to-Maturity [Abstract]      
Amortized Cost 480,000   480,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses (44,000)   (62,000)
Fair Value 436,000   418,000
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 66,121,000   21,750,000
12 Months or More 35,750,000   35,750,000
Total 101,871,000   57,500,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (1,364,000)   (1,617,000)
12 Months or More (2,419,000)   (3,522,000)
Total (3,783,000)   (5,139,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 64,757,000   20,133,000
12 Months or More 33,331,000   32,228,000
Total 98,088,000   52,361,000
Held-to-Maturity, Amortized Cost [Abstract]      
12 Months or More 480,000   480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract]      
12 Months or More (44,000)   (62,000)
Held-to-Maturity, Fair Value [Abstract]      
12 Months or More 436,000   418,000
State and political subdivisions [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 129,975,000   118,055,000
Gross Unrealized Gains 2,480,000   1,907,000
Gross Unrealized Losses (1,885,000)   (3,259,000)
Fair Value 130,570,000   116,703,000
Held-to-Maturity [Abstract]      
Amortized Cost 1,182,000   1,182,000
Gross Unrealized Gains 1,000   1,000
Gross Unrealized Losses 0   0
Fair Value 1,183,000   1,183,000
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 46,229,000   57,165,000
12 Months or More 9,292,000   7,639,000
Total 55,521,000   64,804,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (1,518,000)   (2,789,000)
12 Months or More (367,000)   (470,000)
Total (1,885,000)   (3,259,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 44,711,000   54,376,000
12 Months or More 8,925,000   7,169,000
Total 53,636,000   61,545,000
U.S. government sponsored agency mortgage-backed securities [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 361,327,000   383,174,000
Gross Unrealized Gains 3,086,000   4,325,000
Gross Unrealized Losses (5,762,000)   (8,189,000)
Fair Value 358,651,000   379,310,000
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 257,459,000   248,705,000
12 Months or More     6,579,000
Total 257,459,000   255,284,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (5,762,000)   (8,182,000)
12 Months or More     (7,000)
Total (5,762,000)   (8,189,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 251,697,000   240,523,000
12 Months or More     6,572,000
Total 251,697,000   247,095,000
Debt securities [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 631,335,000   566,753,000
Gross Unrealized Gains 5,795,000   6,457,000
Gross Unrealized Losses (11,430,000)   (16,587,000)
Fair Value 625,700,000   556,623,000
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 369,809,000   327,620,000
Total 414,851,000   377,588,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (8,644,000)   (12,588,000)
Total (11,430,000)   (16,587,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 361,165,000   315,032,000
Total 403,421,000   361,001,000
Marketable equity securities [Member]
      
Available-for-Sale [Abstract]      
Amortized Cost 25,000,000   55,000,000
Gross Unrealized Gains 0   0
Gross Unrealized Losses (573,000)   (2,218,000)
Fair Value 24,427,000   52,782,000
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 25,000,000   55,000,000
Total 25,000,000   55,000,000
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (573,000)   (2,218,000)
Total (573,000)   (2,218,000)
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 24,427,000   52,782,000
Total $ 24,427,000   $ 52,782,000