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Fair Value Measurements - Summary of Quantitative Fair Value Measurements for Level 3 (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired Loans, net 1,958bayk_ImpairedLoansNetOfValuationAllowance 2,077bayk_ImpairedLoansNetOfValuationAllowance
Other real estate owned, net 2,791bayk_OtherRealEstateOwnedFairValueDisclosure 3,897bayk_OtherRealEstateOwnedFairValueDisclosure
Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Impaired Loans, net 1,958bayk_ImpairedLoansNetOfValuationAllowance
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember		 2,077bayk_ImpairedLoansNetOfValuationAllowance
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
Other Real Estate Owned    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Other real estate owned, net 2,791bayk_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember		 3,897bayk_OtherRealEstateOwnedFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
Minimum | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input, Selling Cost 10.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 10.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Unobservable Input, Lack of Marketability 25.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 25.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum | Other Real Estate Owned    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input, Selling Cost 3.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 3.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Unobservable Input, Lack of Marketability 7.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 7.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input, Selling Cost 20.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 20.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Unobservable Input, Lack of Marketability 75.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 100.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum | Other Real Estate Owned    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input, Selling Cost 13.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 13.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Unobservable Input, Lack of Marketability 20.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 30.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Weighted Average | Impaired Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input, Selling Cost 10.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 10.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Unobservable Input, Lack of Marketability 53.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 54.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_ImpairedLoansMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Weighted Average | Other Real Estate Owned    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Unobservable Input, Selling Cost 5.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 6.00%bayk_FairValueInputsSellingCost
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Unobservable Input, Lack of Marketability 11.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		 15.00%us-gaap_FairValueInputsDiscountForLackOfMarketability
/ us-gaap_FairValueByAssetClassAxis
= bayk_OtherRealEstateOwnedMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember