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General - Additional Information (Detail)
Mar. 31, 2015
Bank Of Lancaster  
Organization Presentation And General [Line Items]  
Percent of ownership 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= bayk_BankOfLancasterMember
Bay Trust Company  
Organization Presentation And General [Line Items]  
Percent of ownership 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= bayk_BayTrustCompanyMember
Steptoes Holdings  
Organization Presentation And General [Line Items]  
Percent of ownership 100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ dei_LegalEntityAxis
= bayk_SteptoesHoldingsMember