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21. Fair Value (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fair Value Level 1    
Assets: (market approach)    
Assets Recorded at Fair Value on a Recurring Basis $ 4,000,937us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 $ 6,049,688us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value Level 1 | U.S. GSE debt securities    
Assets: (market approach)    
Assets Recorded at Fair Value on a Recurring Basis 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember		 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Fair Value Level 1 | U.S. Government securities    
Assets: (market approach)    
Assets Recorded at Fair Value on a Recurring Basis 4,000,937us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember		 6,049,688us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value Level 1 | Agency MBS    
Assets: (market approach)    
Assets Recorded at Fair Value on a Recurring Basis 0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= CMTV_AgencyMember		  
Fair Value Level 2    
Assets: (market approach)    
Assets Recorded at Fair Value on a Recurring Basis 28,945,957us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 29,138,914us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value Level 2 | U.S. GSE debt securities    
Assets: (market approach)    
Assets Recorded at Fair Value on a Recurring Basis 19,907,150us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember		 29,138,914us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Fair Value Level 2 | U.S. Government securities    
Assets: (market approach)    
Assets Recorded at Fair Value on a Recurring Basis   0us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value Level 2 | Agency MBS    
Assets: (market approach)    
Assets Recorded at Fair Value on a Recurring Basis $ 9,038,807us-gaap_AssetsFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= CMTV_AgencyMember