Deposits - Scheduled Maturities of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Time Deposits, Fiscal Year Maturity [Abstract]
2018	$ 46,907
2019	39,576
2020	25,214
2021	31,122
2022	9,616
Thereafter	18,252
Total amount	$ 170,687	$ 156,958
Percent
2018	27.50%
2019	23.20%
2020	14.80%
2021	18.20%
2022	5.60%
Thereafter	10.70%
Total percent	100.00%

Weighted average interest rate for time deposits held by the entity with maturities.

No definition available.

Name:	emcf_TimeDepositsWeightedAverageInterestRateMaturities
Namespace Prefix:	emcf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of time deposits maturing after the fifth fiscal year following the latest fiscal year. Time deposits include, but are not limited to, certificates of deposits. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.