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Allowance for Loan Losses - Performing and Non Performing Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Performing and non performing loans    
Loan receivables $ 166,016bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades $ 144,489bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
Performing    
Performing and non performing loans    
Loan receivables 165,511bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 143,308bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember
Nonperforming    
Performing and non performing loans    
Loan receivables 505bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 1,181bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember
Residential First Mortgages    
Performing and non performing loans    
Loan receivables 135,267bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialFirstMortgageMember		 [1] 114,458bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialFirstMortgageMember		 [2]
Residential First Mortgages | Performing    
Performing and non performing loans    
Loan receivables 134,908bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialFirstMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [1] 113,375bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialFirstMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [2]
Residential First Mortgages | Nonperforming    
Performing and non performing loans    
Loan receivables 359bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialFirstMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 [1] 1,083bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialFirstMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 [2]
Residential Revolving and Junior Mortgages    
Performing and non performing loans    
Loan receivables 25,400bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialRevolvingAndJuniorMortgageMember		 [3] 24,045bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialRevolvingAndJuniorMortgageMember		 [4]
Residential Revolving and Junior Mortgages | Performing    
Performing and non performing loans    
Loan receivables 25,369bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialRevolvingAndJuniorMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [3] 23,969bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialRevolvingAndJuniorMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [4]
Residential Revolving and Junior Mortgages | Nonperforming    
Performing and non performing loans    
Loan receivables 31bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialRevolvingAndJuniorMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 [3] 76bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateResidentialRevolvingAndJuniorMortgageMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 [4]
Consumer Loans    
Performing and non performing loans    
Loan receivables 5,349bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateConsumerLoansMember		 [5] 5,986bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateConsumerLoansMember		 [6]
Consumer Loans | Performing    
Performing and non performing loans    
Loan receivables 5,234bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateConsumerLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [5] 5,964bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateConsumerLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PerformingFinancingReceivableMember		 [6]
Consumer Loans | Nonperforming    
Performing and non performing loans    
Loan receivables $ 115bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateConsumerLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 [5] $ 22bayk_LoansAndLeasesReceivableGrossCarryingAmountExcludingInternalRiskRatingGrades
/ us-gaap_FinancialInstrumentAxis
= bayk_RealEstateConsumerLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_NonperformingFinancingReceivableMember		 [6]
[1] Residential First Mortgages which have been assigned a risk rating grade of Substandard totaled $2.1 million as of December 31, 2014.
[2] Residential First Mortgages which have been assigned a risk rating grade of Substandard totaled $2.6 million as of December 31, 2013.
[3] Residential Revolving and Junior Mortgages which have been assigned a risk rating grade of Substandard totaled $219 thousand as of December 31, 2014.
[4] Residential Revolving and Junior Mortgages which have been assigned a risk rating grade of Substandard totaled $216 thousand as of December 31, 2013.
[5] Consumer Loans which have been assigned a risk rating grade of Substandard totaled $1 thousand as of December 31, 2014.
[6] Consumer Loans which have been assigned a risk rating grade of Substandard totaled $9 thousand as of December 31, 2013.