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Investment Securities (Summary Of Amortized Cost And Fair Values Of Securities Classified As Available For Sale And Held To Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Available for Sale, Amortized Cost $ 201,162us-gaap_AvailableForSaleSecuritiesAmortizedCost $ 252,733us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for Sale, Gross Unrealized Gains 3,034us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 3,234us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Available for Sale, Gross Unrealized Losses 723us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss 3,454us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Available for Sale, Fair Value 203,473us-gaap_AvailableForSaleSecurities 252,513us-gaap_AvailableForSaleSecurities
Held-to-maturity Securities, Amortized Cost 138,421us-gaap_HeldToMaturitySecurities 140,826us-gaap_HeldToMaturitySecurities
Held to Maturity, Gross Unrealized Gains 1,269us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains 25us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
Held to Maturity, Gross Unrealized Losses 519us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses 3,764us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
Held-to-maturity Securities, Fair Value 139,171us-gaap_HeldToMaturitySecuritiesFairValue 137,087us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Treasury Obligations [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Available for Sale, Amortized Cost 25,048us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
100us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Available for Sale, Gross Unrealized Gains 57us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Available for Sale, Gross Unrealized Losses 12us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
Available for Sale, Fair Value 25,093us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
100us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USTreasurySecuritiesMember
U.S. Agency Obligations [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 22,072us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
23,580us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held to Maturity, Gross Unrealized Gains 597us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held to Maturity, Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
458us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Held-to-maturity Securities, Fair Value 22,669us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
23,122us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
U.S. GSEs [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 9,498us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
9,442us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Held to Maturity, Gross Unrealized Gains 59us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Held to Maturity, Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
512us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Held-to-maturity Securities, Fair Value 9,557us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
8,930us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
FHLB Obligations [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Held-to-maturity Securities, Amortized Cost 4,720us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
4,684us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Held to Maturity, Gross Unrealized Gains 100us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Held to Maturity, Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
191us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Held-to-maturity Securities, Fair Value 4,820us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
4,493us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Agency MBSs [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Available for Sale, Amortized Cost 92,827us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
97,882us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Gross Unrealized Gains 2,680us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
2,876us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Gross Unrealized Losses 100us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
1,487us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Available for Sale, Fair Value 95,407us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
99,271us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held-to-maturity Securities, Amortized Cost 8,109us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
9,015us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to Maturity, Gross Unrealized Gains 233us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
25us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held to Maturity, Gross Unrealized Losses 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
177us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Held-to-maturity Securities, Fair Value 8,342us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
8,863us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Agency CMBSs [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Available for Sale, Amortized Cost 22,056us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
18,398us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Available for Sale, Gross Unrealized Gains 20us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Available for Sale, Gross Unrealized Losses 372us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
760us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Available for Sale, Fair Value 21,704us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
17,638us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
Agency CMOs [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Available for Sale, Amortized Cost 60,880us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
98,162us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Available for Sale, Gross Unrealized Gains 241us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
254us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Available for Sale, Gross Unrealized Losses 239us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
1,207us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Available for Sale, Fair Value 60,882us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
97,209us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Held-to-maturity Securities, Amortized Cost 94,022us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
94,105us-gaap_HeldToMaturitySecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Held to Maturity, Gross Unrealized Gains 280us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Held to Maturity, Gross Unrealized Losses 519us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
2,426us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
Held-to-maturity Securities, Fair Value 93,783us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
91,679us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= mbvt_CollateralizedMortgageObligationsIssuedByUSGovernmentSponsoredEntitiesMember
CLOs [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Available for Sale, Amortized Cost   37,834us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
Available for Sale, Gross Unrealized Gains   73us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
Available for Sale, Gross Unrealized Losses   0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
Available for Sale, Fair Value   37,907us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedLoanObligationsMember
ABSs [Member]    
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]    
Available for Sale, Amortized Cost 351us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
357us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available for Sale, Gross Unrealized Gains 36us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
31us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available for Sale, Gross Unrealized Losses 0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
Available for Sale, Fair Value $ 387us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember
$ 388us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_AssetBackedSecuritiesMember