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Deposits - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Time Deposits, $250,000 or more	$ 38,989	$ 29,400

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- Definition

Time Deposits, $250,000 or More

+ References

No definition available.

+ Details

Name:	emcf_TimeDeposits250000orMore
Namespace Prefix:	emcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration