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Cash and Due from Banks and Interest Bearing Deposits
 12 Months Ended
Dec. 31, 2011
Cash and Due from Banks and Interest Bearing Deposits [Abstract]  
Cash and Due from Banks and Interest Bearing Deposits
3.  Cash and Due from Banks and Interest Bearing Deposits
 
Included in cash and due from banks and interest bearing deposits are amounts required to be held at the Federal Reserve or maintained in vault cash in accordance with regulatory reserve requirements.  The balance requirements were $52.1 million and $46.1 million at December 31, 2011 and 2010, respectively.
 
Effective July 21, 2010, the FDIC's insurance limits were permanently increased to $250,000.  At December 31, 2011, CTBI had no cash accounts which exceeded federally insured limits; however, CTBI had $159 million in deposits with the Federal Reserve which are not subject to FDIC insurance.
 
Pursuant to legislation enacted in 2010, the FDIC fully insures all noninterest bearing transaction accounts beginning December 31, 2010 through December 31, 2012, at all FDIC insured institutions.