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Loans - Schedule of Composition of Loan Portfolio by Segment and Class (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount $ 59,169us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 61,650us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Premiums and net deferred loan costs (39)bffi_LoansAndLeasesReceivablePremiumsAndDeferredLoanCosts (39)bffi_LoansAndLeasesReceivablePremiumsAndDeferredLoanCosts    
Gross loans, Percent 100.00%bffi_LoansAndLeasesReceivableRatioToAllLoans 100.00%bffi_LoansAndLeasesReceivableRatioToAllLoans    
Allowance for loan losses (1,179)us-gaap_LoansAndLeasesReceivableAllowance (1,206)us-gaap_LoansAndLeasesReceivableAllowance (1,450)us-gaap_LoansAndLeasesReceivableAllowance (1,302)us-gaap_LoansAndLeasesReceivableAllowance
Total loans, net 57,951us-gaap_LoansAndLeasesReceivableNetReportedAmount 60,405us-gaap_LoansAndLeasesReceivableNetReportedAmount    
Automobile [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 1,241us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AutomobileLoanMember
1,401us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AutomobileLoanMember
   
Allowance for loan losses (62)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AutomobileLoanMember
(66)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AutomobileLoanMember
   
One-To-Four-Family [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 30,799us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= bffi_OneToFourFamilyMember
31,430us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= bffi_OneToFourFamilyMember
   
Allowance for loan losses (370)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= bffi_OneToFourFamilyMember
(392)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= bffi_OneToFourFamilyMember
   
Multi-Family [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 9,717us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
9,834us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
   
Allowance for loan losses (340)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
(354)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
   
Commercial Real Estate [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 9,580us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
10,324us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
   
Allowance for loan losses (288)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(277)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
   
Home Equity Line of Credit [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 6,511us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
7,360us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
   
Allowance for loan losses (92)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
(96)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
   
Commercial [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 696us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
826us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
   
Allowance for loan losses (7)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(8)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
   
Other Consumer [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 1us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
2us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
   
Land [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 208us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
213us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
   
Allowance for loan losses (6)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
(6)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
   
First Mortgage Loans [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 50,720us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
52,061us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Gross loans, Percent 85.72%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
84.45%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
First Mortgage Loans [Member] | One-To-Four-Family [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 30,799us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= bffi_OneToFourFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
31,430us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= bffi_OneToFourFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Gross loans, Percent 52.06%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= bffi_OneToFourFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
50.98%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= bffi_OneToFourFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
First Mortgage Loans [Member] | Multi-Family [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 9,717us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
9,834us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Gross loans, Percent 16.42%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
15.95%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Allowance for loan losses (340)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(354)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(246)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(252)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= bffi_MultiFamilyMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
First Mortgage Loans [Member] | Commercial Real Estate [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 9,580us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
10,324us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Gross loans, Percent 16.19%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
16.75%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Allowance for loan losses (288)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(277)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(257)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(300)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
First Mortgage Loans [Member] | Construction Loans [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 416us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
260us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Gross loans, Percent 0.70%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
0.42%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConstructionLoansMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
First Mortgage Loans [Member] | Land [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 208us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
213us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Gross loans, Percent 0.35%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
0.35%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
   
Allowance for loan losses (6)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(6)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(7)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
(7)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_MajorPropertyClassAxis
= us-gaap_LandMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= us-gaap_FirstMortgageMember
Commercial, Consumer and Other Loans [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 8,449us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
9,589us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Gross loans, Percent 14.28%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
15.55%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Commercial, Consumer and Other Loans [Member] | Automobile [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 1,241us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AutomobileLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
1,401us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AutomobileLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Gross loans, Percent 2.10%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AutomobileLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
2.27%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_AutomobileLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Commercial, Consumer and Other Loans [Member] | Home Equity Line of Credit [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 6,511us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
7,360us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Gross loans, Percent 11.00%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
11.94%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Allowance for loan losses (92)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
(96)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
(137)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
(78)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_HomeEquityMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
Commercial, Consumer and Other Loans [Member] | Commercial [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount 696us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
826us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Gross loans, Percent 1.18%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
1.34%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Commercial, Consumer and Other Loans [Member] | Other Consumer [Member]        
Schedule Of Financing Receivable Troubled Debt Restructurings [Line Items]        
Gross loans, Amount $ 1us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
$ 2us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
   
Gross loans, Percent 0.00%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember
0.00%bffi_LoansAndLeasesReceivableRatioToAllLoans
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerOtherFinancingReceivableMember
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= bffi_CommercialConsumerAndOtherLoansMember