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Securities (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Securities Available-for-Sale [Abstract]      
Amortized Cost $ 621,753,000 $ 583,858,000  
Gross Unrealized Gains 6,457,000 19,970,000  
Gross Unrealized Losses (18,805,000) (485,000)  
Fair Value 609,405,000 603,343,000  
Securities Held-to-Maturity [Abstract]      
Amortized Cost 1,662,000 1,662,000  
Gross Unrealized Gains 1,000 1,000  
Gross Unrealized Losses (62,000) (4,000)  
Fair Value 1,601,000 1,659,000  
Available-for-Sale, Amortized Cost [Abstract]      
Due in one year or less 3,844,000    
Due after one through five years 29,673,000    
Due after five through ten years 117,690,000    
Due after ten years 32,372,000    
U.S. government sponsored agency mortgage-backed securities 383,174,000    
Total debt securities 566,753,000    
Marketable equity securities 55,000,000    
Total securities 621,753,000    
Available-for-Sale, Fair Value [Abstract]      
Due in one year or less 3,863,000    
Due after one through five years 30,137,000    
Due after five through ten years 112,175,000    
Due after ten years 31,138,000    
U.S. government sponsored agency mortgage-backed securities 379,310,000    
Total debt securities 556,623,000    
Marketable equity securities 52,782,000    
Total securities 609,405,000    
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 418,000    
U.S. government sponsored agency mortgage-backed securities 0    
Total debt securities 1,601,000    
Marketable equity securities 0    
Total securities 1,601,000    
Securities gains (loss), net (45,000) 1,155,000 218,000
Realized pre-tax gain on sale of securities 612,000 2,400,000 218,000
Realized pre-tax loss on sale of securities 657,000 1,200,000  
Securities pledged as collateral to secure public deposit and for other purposes 257,500,000 262,400,000  
Amortized cost of securities sold under agreements to repurchase 255,400,000 237,300,000  
Percentage of total investment with unrealized losses (in hundredths) 67.80% 14.80%  
CTBI fixed income mutual funds of total fair value 52,800,000    
CTBI fixed income mutual funds of total unrealized losses 2,200,000    
Percentage included in total fair value in CTBI (in hundredths) 54.00%    
Percentage included in total unrealized losses in CTBI (in hundredths) 68.00%    
Percentage included in total fair value in CRA (in hundredths) 46.00%    
Percentage included in total unrealized losses in CRA (in hundredths) 32.00%    
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 382,620,000 89,265,000  
12 Months or More 49,968,000    
Total 432,588,000 89,265,000  
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (14,806,000) (485,000)  
12 Months or More (3,999,000)    
Total (18,805,000) (485,000)  
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 367,814,000 88,780,000  
12 Months or More 45,969,000    
Total 413,783,000 88,780,000  
Held-to-Maturity, Amortized Cost [Abstract]      
Less Than 12 Months 480,000 480,000  
Held-to-Maturity, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (62,000) (4,000)  
Held-to-Maturity, Fair Value [Abstract]      
Less Than 12 Months 418,000 476,000  
Maximum [Member]
      
Held-to-Maturity, Fair Value [Abstract]      
Percentage Severity of the impairment in fair value (in hundredths) 5.00%    
Minimum [Member]
      
Held-to-Maturity, Fair Value [Abstract]      
Percentage Severity of the impairment in fair value (in hundredths) 2.80%    
U.S. Treasury and government agencies [Member]
      
Securities Available-for-Sale [Abstract]      
Amortized Cost 65,524,000 60,625,000  
Gross Unrealized Gains 225,000 463,000  
Gross Unrealized Losses (5,139,000) (173,000)  
Fair Value 60,610,000 60,915,000  
Securities Held-to-Maturity [Abstract]      
Amortized Cost 480,000 480,000  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (62,000) (4,000)  
Fair Value 418,000 476,000  
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 21,750,000 47,576,000  
12 Months or More 35,750,000    
Total 57,500,000 47,576,000  
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (1,617,000) (173,000)  
12 Months or More (3,522,000)    
Total (5,139,000) (173,000)  
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 20,133,000 47,403,000  
12 Months or More 32,228,000    
Total 52,361,000 47,403,000  
Held-to-Maturity, Amortized Cost [Abstract]      
Less Than 12 Months 480,000 480,000  
Held-to-Maturity, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (62,000) (4,000)  
Held-to-Maturity, Fair Value [Abstract]      
Less Than 12 Months 418,000 476,000  
State and political subdivisions [Member]
      
Securities Available-for-Sale [Abstract]      
Amortized Cost 118,055,000 107,987,000  
Gross Unrealized Gains 1,907,000 5,369,000  
Gross Unrealized Losses (3,259,000) (135,000)  
Fair Value 116,703,000 113,221,000  
Securities 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 57,165,000 11,126,000  
12 Months or More 7,639,000    
Total 64,804,000 11,126,000  
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (2,789,000) (135,000)  
12 Months or More (470,000)    
Total (3,259,000) (135,000)  
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 54,376,000 10,991,000  
12 Months or More 7,169,000    
Total 61,545,000 10,991,000  
U.S. government sponsored agency mortgage-backed securities [Member]
      
Securities Available-for-Sale [Abstract]      
Amortized Cost 383,174,000 370,246,000  
Gross Unrealized Gains 4,325,000 13,347,000  
Gross Unrealized Losses (8,189,000) (12,000)  
Fair Value 379,310,000 383,581,000  
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 248,705,000 10,563,000  
12 Months or More 6,579,000    
Total 255,284,000 10,563,000  
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (8,182,000) (12,000)  
12 Months or More (7,000)    
Total (8,189,000) (12,000)  
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 240,523,000 10,551,000  
12 Months or More 6,572,000    
Total 247,095,000 10,551,000  
Debt securities [Member]
      
Securities Available-for-Sale [Abstract]      
Amortized Cost 566,753,000 538,858,000  
Gross Unrealized Gains 6,457,000 19,179,000  
Gross Unrealized Losses (16,587,000) (320,000)  
Fair Value 556,623,000 557,717,000  
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 327,620,000 69,265,000  
12 Months or More 49,968,000    
Total 377,588,000 69,265,000  
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (12,588,000) (320,000)  
12 Months or More (3,999,000)    
Total (16,587,000) (320,000)  
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 315,032,000 68,945,000  
12 Months or More 45,969,000    
Total 361,001,000 68,945,000  
Marketable equity securities [Member]
      
Securities Available-for-Sale [Abstract]      
Amortized Cost 55,000,000 45,000,000  
Gross Unrealized Gains 0 791,000  
Gross Unrealized Losses (2,218,000) (165,000)  
Fair Value 52,782,000 45,626,000  
Available-for-Sale, Amortized Cost [Abstract]      
Less Than 12 Months 55,000,000 20,000,000  
12 Months or More 0    
Total 55,000,000 20,000,000  
Available-for-Sale, Gross Unrealized Losses [Abstract]      
Less Than 12 Months (2,218,000) (165,000)  
12 Months or More 0    
Total (2,218,000) (165,000)  
Available-for-Sale, Fair Value [Abstract]      
Less Than 12 Months 52,782,000 19,835,000  
12 Months or More 0    
Total $ 52,782,000 $ 19,835,000  
Agency Securities [Member]
      
Available-for-Sale, Fair Value [Abstract]      
Number of security sold 1 4 1
Municipal securities [Member]
      
Available-for-Sale, Fair Value [Abstract]      
Number of securities called 2 1 0
Mortgage Backed Securities [Member]
      
Available-for-Sale, Fair Value [Abstract]      
Number of security sold 7 1 0
Auction Rate Securities [Member]
      
Available-for-Sale, Fair Value [Abstract]      
Number of security sold 0 5 0