Note 8 - Deposits - Scheduled Maturities of Time Deposits $250,000 or More (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Three months or less	$ 4,367
Over three months to six months	3,891
Over six months to twelve months	9,183
Over twelve months	43,744
Total	$ 61,185

Amount of time deposits above $250,000 maturing in three months through six months.

No definition available.

Name:	emcf_ContractualMaturitiesTimeDeposits250000OrMoreThreeMonthsThroughSixMonths
Namespace Prefix:	emcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant