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Off-Balance Sheet Transactions and Guarantees (Tables)
12 Months Ended
Dec. 31, 2012
Off Balance Sheet Transactions and Guarantees [Abstract]  
Off-balance sheet financial instruments [Table Text Block]
At December 31, CTBI had the following off-balance sheet financial instruments, whose approximate contract amounts represent additional credit risk to CTBI:
 
(in thousands)
 
2012
  
2011
 
Standby letters of credit
 $41,207  $50,201 
Commitments to extend credit
  386,293   375,736 
Total off-balance sheet financial instruments
 $427,500  $425,937