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Loans (Breakdown Of Loans By Risk Grading) (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans $ 494,061,000us-gaap_LoansAndLeasesReceivableCommercial $ 498,728,000us-gaap_LoansAndLeasesReceivableCommercial
Gross loans 672,764,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 679,858,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Deferred Origination Fees, net of costs (491,000)us-gaap_LoansAndLeasesReceivableDeferredIncome (501,000)us-gaap_LoansAndLeasesReceivableDeferredIncome
Loans: Ending Balance 672,273,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome 679,357,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Percent of Total Loans 100.00%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans 100.00%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
Charge-offs 300,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs 1,283,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
0001-0005 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 435,858,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 436,614,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Gross loans 610,298,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 613,505,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Percent of Total Loans 90.70%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 90.20%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 33,422,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 36,236,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Gross loans 35,897,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 38,505,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Percent of Total Loans 5.30%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 5.70%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Increase (decrease) in loan balances (2,600,000)us-gaap_IncreaseDecreaseInFinanceReceivables
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		  
Loan payments and payoffs 3,200,000us-gaap_ProceedsFromCollectionOfLoansReceivable
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		  
Proceeds from sale of loan collateral 2,500,000bylk_ProceedsFromSaleOfLoanCollateral
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		  
0006B [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 6,345,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		 7,655,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember
Gross loans 6,547,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		 8,069,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember
Percent of Total Loans 1.00%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		 1.20%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember
Increase (decrease) in loan balances (1,500,000)us-gaap_IncreaseDecreaseInFinanceReceivables
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		  
Loan payments and payoffs 600,000us-gaap_ProceedsFromCollectionOfLoansReceivable
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		  
0007 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 18,436,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		 [1] 18,223,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember
Gross loans 20,022,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		 [1] 19,779,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember
Percent of Total Loans 3.00%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		 2.90%bylk_LoansAndLeasesReceivableRiskGradedLoansByRiskGradingAsPercentageOfTotalLoans
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember
Increase (decrease) in loan balances 200,000us-gaap_IncreaseDecreaseInFinanceReceivables
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		  
Loan payments and payoffs 600,000us-gaap_ProceedsFromCollectionOfLoansReceivable
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		  
Charge-offs 300,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		  
0007 Rated Loans Not Impaired [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross loans 7,400,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansLoansIncludedInClassButNotImpairedMember		 6,000,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansLoansIncludedInClassButNotImpairedMember
Commercial - Syndicated [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 65,040,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 65,429,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Gross loans 65,040,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 65,429,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Loans: Ending Balance 65,040,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember		 65,429,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Charge-offs   178,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial - Syndicated [Member] | 0001-0005 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 60,490,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 60,694,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Commercial - Syndicated [Member] | 0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 4,550,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 4,735,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Commercial - Other [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 83,815,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember		 88,045,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
Gross loans 83,815,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember		 88,045,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
Loans: Ending Balance 83,815,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember		 88,045,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
Charge-offs 15,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember		 116,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
Commercial - Other [Member] | 0001-0005 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 77,646,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 81,530,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Commercial - Other [Member] | 0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 4,360,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 4,224,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Commercial - Other [Member] | 0006B [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 771,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		 1,240,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember
Commercial - Other [Member] | 0007 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 1,038,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		 [1] 1,051,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_CommercialOtherPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember
Real Estate - Commercial [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 311,725,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 304,446,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Gross loans 311,725,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 304,446,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Loans: Ending Balance 311,234,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 303,945,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Charge-offs 268,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 656,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Real Estate - Commercial [Member] | 0001-0005 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 266,422,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 255,711,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Real Estate - Commercial [Member] | 0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 22,524,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 26,124,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Real Estate - Commercial [Member] | 0006B [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 5,572,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		 5,632,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember
Real Estate - Commercial [Member] | 0007 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 17,207,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		 [1] 16,979,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember
Construction [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 33,481,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 40,808,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Gross loans 33,481,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 40,808,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Loans: Ending Balance 33,481,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember		 40,808,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Charge-offs   162,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
Construction [Member] | 0001-0005 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 31,300,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 38,679,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Construction [Member] | 0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 1,988,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 1,153,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Construction [Member] | 0006B [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 2,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		 783,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember
Construction [Member] | 0007 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross commercial loans 191,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		 [1] 193,000us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember
Real Estate - Mortgage [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 150,911,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 152,091,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Gross loans 150,911,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 152,091,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Loans: Ending Balance 150,911,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember		 152,091,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Charge-offs   88,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Real Estate - Mortgage [Member] | 0001-0005 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 147,680,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 148,835,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Real Estate - Mortgage [Member] | 0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 1,533,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 1,299,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Real Estate - Mortgage [Member] | 0006B [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 202,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		 414,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember
Real Estate - Mortgage [Member] | 0007 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 1,496,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		 [1] 1,543,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember
Consumer [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 5,719,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 6,075,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Gross loans 5,719,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 6,075,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Loans: Ending Balance 5,719,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 6,075,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Charge-offs 17,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 83,000us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Consumer [Member] | 0001-0005 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 5,629,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 6,062,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Consumer [Member] | 0007 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 90,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		 [1] 13,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember
Municipal Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 22,073,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember		 22,964,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember
Gross loans 22,073,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember		 22,964,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember
Loans: Ending Balance 22,073,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember		 22,964,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember
Municipal Loans [Member] | 0001-0005 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 21,131,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember		 21,994,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_ExcellentRiskSatisfactoryRiskMember
Municipal Loans [Member] | 0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Gross consumer loans 942,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		 970,000us-gaap_LoansAndLeasesReceivableConsumer
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_MunicipalLoansMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember
Upgraded From Risk Categories 0006B And 0007 [Member] | 0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Increase (decrease) in loan balances 1,100,000us-gaap_IncreaseDecreaseInFinanceReceivables
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_UpgradedFromRiskCategories0006bAnd0007Member
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		  
Downgraded From Categories 0001 To 0005 [Member] | 0006A [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Increase (decrease) in loan balances (600,000)us-gaap_IncreaseDecreaseInFinanceReceivables
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_DowngradedFromCategories0001To0005Member
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WeaknessDetectedInEitherManagementCapacityToRepayOrBalanceSheetMember		  
Downgraded From Categories 0001 To 0005 [Member] | 0006B [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Increase (decrease) in loan balances 100,000us-gaap_IncreaseDecreaseInFinanceReceivables
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_DowngradedFromCategories0001To0005Member
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		  
Upgraded To Risk Category 0006A [Member] | 0006B [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Increase (decrease) in loan balances (1,000,000)us-gaap_IncreaseDecreaseInFinanceReceivables
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_UpgradedToRiskCategory0006aMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_HaveWeaknessesThatDeserveManagementsCloseAttentionMember		  
Downgraded From Risk Category 0006A [Member] | 0007 [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Increase (decrease) in loan balances $ 1,100,000us-gaap_IncreaseDecreaseInFinanceReceivables
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bylk_DowngradedFromRiskCategory0006aMember
/ us-gaap_InternalCreditAssessmentAxis
= bylk_WellDefinedWeaknessesAndTrendsThatJeopardizeRepaymentOfLoansMember		  
[1] Included in the 0007 risk grading are $7.4 million of loans that are evaluated but not considered impaired because, in the event of default, no loss is expected, therefore they are included in loans that are collectively evaluated for the general AFLL allocation.