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Cash and Due from Banks and Interest Bearing Deposits	12 Months Ended
Cash and Due from Banks and Interest Bearing Deposits	Dec. 31, 2020
Cash and Due from Banks and Interest Bearing Deposits [Abstract]
Cash and Due from Banks and Interest Bearing Deposits	2. Cash and Due from Banks and Interest Bearing Deposits Included in cash and due from banks and interest bearing deposits at December 31, 2019 were amounts required to be held at the Federal Reserve or maintained in vault cash in accordance with regulatory reserve requirements. The balance requirement was $78.0 million at December 31, 2019. On March 26, 2020, the Federal Reserve Board eliminated the reserve requirement on deposits at the Federal Reserve so institutions could have additional liquidity to lend to customers. At December 31, 2020, CTBI had cash accounts which exceeded federally insured limits, and therefore were not subject to FDIC insurance, with $280.7 million in deposits with the Federal Reserve, $21.3 million in deposits with US Bank, $0.4 million in deposits with Fifth Third Bank, and $3.3 million in deposits with the Federal Home Loan Bank.