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Cash and Due from Banks and Interest Bearing Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Federal Reserve [Member]
Cash and Due from Banks and Interest Bearing Deposits [Abstract]
Balance requirements	$ 74.7	$ 73.5
Cash accounts which exceeded federally insured limits	73.5
US Bank [Member]
Cash and Due from Banks and Interest Bearing Deposits [Abstract]
Cash accounts which exceeded federally insured limits	29.1
Fifth Third Bank [Member]
Cash and Due from Banks and Interest Bearing Deposits [Abstract]
Cash accounts which exceeded federally insured limits	0.7
Federal Home Loan Bank [Member]
Cash and Due from Banks and Interest Bearing Deposits [Abstract]
Cash accounts which exceeded federally insured limits	$ 2.2

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- References

No definition available.

+ Details

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Namespace Prefix:	ctbi_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cash subject to withdrawal restrictions, restricted deposits held as compensating balances, and cash and securities segregated in compliance with regulations (such as cash deposited in a special reserve account for the exclusive benefit of customers).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 305
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

+ Details

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- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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