Name:	emcf_FinancingReceivableNumberOfExtendedPaymentDeferrals
Namespace Prefix:	emcf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Number of payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

No definition available.

Name:	emcf_FinancingReceivableNumberOfPaymentDeferrals
Namespace Prefix:	emcf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

The value of financing receivable that is originated under the paycheck protection program.

No definition available.

Name:	emcf_FinancingReceivablePaycheckProtectionProgramLoansOriginated
Namespace Prefix:	emcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Deferred amounts of principal and interest payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

No definition available.

Name:	emcf_FinancingReceivablePrincipalAndInterestDeferredPayments
Namespace Prefix:	emcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Deferred amounts of principal and interest payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19, which deferrals have been extended for a second deferral.

No definition available.

Name:	emcf_FinancingReceivablePrincipalAndInterestDeferredPaymentsExtended
Namespace Prefix:	emcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The number of paycheck protection program loans originated.

No definition available.