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2. Investment Securities (Details 2) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Less than 12 months $ 9,230,335us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue $ 12,129,166us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Unrealized Loss Less than 12 months 20,874us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses 195,643us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
Fair Value 12 months or more 5,186,258us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue 1,004,235us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Unrealized Loss 12 months or more 63,741us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 1,333us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
Fair Value 14,416,593us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 13,133,401us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Unrealized Loss 84,615us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses 196,976us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
U.S. GSE debt securities    
Fair Value Less than 12 months 6,023,946us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
11,094,830us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Unrealized Loss Less than 12 months 8,548us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
194,188us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Fair Value 12 months or more 5,186,258us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
1,004,235us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Unrealized Loss 12 months or more 63,741us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
1,333us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Fair Value 11,210,204us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
12,099,065us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Unrealized Loss 72,289us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
195,521us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Agency MBS    
Fair Value Less than 12 months 3,206,389us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= CMTV_AgencyMortgageBackedSecuritiesMember
 
Unrealized Loss Less than 12 months 12,326us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= CMTV_AgencyMortgageBackedSecuritiesMember
 
Fair Value 12 months or more 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= CMTV_AgencyMortgageBackedSecuritiesMember
 
Unrealized Loss 12 months or more 0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= CMTV_AgencyMortgageBackedSecuritiesMember
 
Fair Value 3,206,389us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= CMTV_AgencyMortgageBackedSecuritiesMember
 
Unrealized Loss 12,326us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= CMTV_AgencyMortgageBackedSecuritiesMember
 
U.S. Government securities    
Fair Value Less than 12 months   1,034,336us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Loss Less than 12 months   1,455us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value 12 months or more   0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Loss 12 months or more   0us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value   1,034,336us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized Loss   $ 1,455us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember