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Goodwill and Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Goodwill, Gross Carrying Amount $ 3,664us-gaap_Goodwill $ 3,664us-gaap_Goodwill
Core deposit intangibles, Goodwill, Gross Carrying Amount 4,027us-gaap_FiniteLivedCoreDepositsGross 4,027us-gaap_FiniteLivedCoreDepositsGross
Goodwill, Gross Carrying Amount, Total 7,691us-gaap_IntangibleAssetsNetIncludingGoodwill 7,691us-gaap_IntangibleAssetsNetIncludingGoodwill
Goodwill, Accumulated Amortization 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Core deposit intangibles, Accumulated Amortization 3,327us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 3,278us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Accumulated Amortization, Total $ 3,327emcf_FiniteLivedIntangibleAssetsAccumulatedAmortizationIncludingGoodwill $ 3,278emcf_FiniteLivedIntangibleAssetsAccumulatedAmortizationIncludingGoodwill