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Regulatory Matters (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Total capital (to risk-weighted assets), Ratio [Abstract]    
Number of consultative documents released by the Basel Committee 2  
Maximum countercyclical buffer specified as percentage of common equity Tier 1 capital (in hundredths) 2.50%  
Assets threshold for advanced approach banks $ 250,000,000,000  
Foreign exposures threshold for advanced approach banks 10,000,000,000  
Total assets threshold for small depository institution 15,000,000,000  
Minimum assets for top tier banking organizations for disclosure requirements 50,000,000,000  
Minimum consolidated assets for banks to which top tier banking organizations apply 250,000,000,000  
Community Trust Bank, Inc [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Maximum dividend without Approval 59,400,000  
Tier I capital (to average assets), Amount [Abstract]    
Actual Amount 392,932,000 363,331,000
For Capital Adequacy Purposes 142,496,000 142,343,000
To Be Well-Capitalized Under Prompt Corrective Action Provision 178,120,000 177,929,000
Tier I capital (to average assets), Ratio [Abstract]    
Actual Ratio (in hundredths) 11.03% 10.21%
For Capital Adequacy Purposes (in hundredths) 4.00% 4.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) 5.00% 5.00%
Tier I capital (to risk weighted assets), Amount [Abstract]    
Actual Amount 392,932,000 363,331,000
For Capital Adequacy Purposes 101,730,000 99,679,000
To Be Well-Capitalized Under Prompt Corrective Action Provision 152,595,000 149,519,000
Tier I capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio (in hundredths) 15.45% 14.58%
For Capital Adequacy Purposes (in hundredths) 4.00% 4.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) 6.00% 6.00%
Total capital (to risk weighted assets), Amount [Abstract]    
Actual Amount 424,754,000 394,796,000
For Capital Adequacy Purposes 203,475,000 199,392,000
To Be Well-Capitalized Under Prompt Corrective Action Provision 254,344,000 249,240,000
Total capital (to risk-weighted assets), Ratio [Abstract]    
Actual Ratio (in hundredths) 16.70% 15.84%
For Capital Adequacy Purposes (in hundredths) 8.00% 8.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) 10.00% 10.00%
Community Trust Bancorp, Inc. [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Restricted core capital elements (in hundredths) 25.00%  
Transition period of final rule 5 years  
Tier I capital (to average assets), Amount [Abstract]    
Actual Amount 412,053,000 380,549,000
For Capital Adequacy Purposes 143,198,000 142,929,000
Tier I capital (to average assets), Ratio [Abstract]    
Actual Ratio (in hundredths) 11.51% 10.65%
For Capital Adequacy Purposes (in hundredths) 4.00% 4.00%
Tier I capital (to risk weighted assets), Amount [Abstract]    
Actual Amount 412,053,000 380,549,000
For Capital Adequacy Purposes 102,056,000 99,947,000
Tier I capital (to risk weighted assets), Ratio [Abstract]    
Actual Ratio (in hundredths) 16.15% 15.23%
For Capital Adequacy Purposes (in hundredths) 4.00% 4.00%
Total capital (to risk weighted assets), Amount [Abstract]    
Actual Amount 443,875,000 412,014,000
For Capital Adequacy Purposes $ 204,080,000 $ 199,886,000
Total capital (to risk-weighted assets), Ratio [Abstract]    
Actual Ratio (in hundredths) 17.40% 16.49%
For Capital Adequacy Purposes (in hundredths) 8.00% 8.00%
CTBI and CTB [Member] | Rules in 2015 [Member]
   
Tier I capital (to risk weighted assets), Ratio [Abstract]    
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) 8.00%  
Total capital (to risk-weighted assets), Ratio [Abstract]    
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths) 10.00%  
Common equity Tier 1 capital ratio under well capitalized (in hundredths) 6.50%  
Tier 1 leverage ratio under well capitalized (in hundredths) 5.00%  
CTBI and CTB [Member] | Rules from 2015 to 2019 [Member]
   
Tier I capital (to risk weighted assets), Ratio [Abstract]    
For Capital Adequacy Purposes (in hundredths) 6.00%  
Total capital (to risk-weighted assets), Ratio [Abstract]    
For Capital Adequacy Purposes (in hundredths) 8.00%  
Common equity Tier one capital ratio (in hundredths) 4.50%  
Tier 1 leverage ratio (in hundredths) 4.00%  
Capital conservation buffer in 2016 (in hundredths) 0.625%  
Capital conservation buffer in 2017 (in hundredths) 1.25%  
Capital conservation buffer in 2018 (in hundredths) 1.875%  
Capital conservation buffer in 2019 and thereafter (in hundredths) 2.50%  
CTBI and CTB [Member] | Rules in 2019 [Member]
   
Tier I capital (to risk weighted assets), Ratio [Abstract]    
For Capital Adequacy Purposes (in hundredths) 8.50%  
Total capital (to risk-weighted assets), Ratio [Abstract]    
For Capital Adequacy Purposes (in hundredths) 10.50%  
Common equity Tier one capital ratio (in hundredths) 7.00%