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Off-Balance Sheet Transactions and Guarantees (Tables)
12 Months Ended
Dec. 31, 2017
Off-Balance Sheet Transactions and Guarantees [Abstract]  
Off-Balance Sheet Financial Instruments
At December 31, CTBI had the following off-balance sheet financial instruments, whose approximate contract amounts represent additional credit risk to CTBI:

(in thousands)
 
2017
  
2016
 
Standby letters of credit
 
$
29,308
  
$
29,917
 
Commitments to extend credit
  
516,731
   
570,467
 
Total off-balance sheet financial instruments
 
$
546,039
  
$
600,384