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Loans Receivable Held for Sale (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Loans Receivable Held for Sale    
Loans receivable held for sale $ 19,813,000us-gaap_LoansReceivableHeldForSaleNet $ 19,481,000us-gaap_LoansReceivableHeldForSaleNet
Payments for Origination of Mortgage Loans Held-for-sale 12,562,000us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale  
Multi-family    
Loans Receivable Held for Sale    
Loans receivable held for sale 19,800,000us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= byfc_MultiFamilyResidentialLoanMember		 19,500,000us-gaap_LoansReceivableHeldForSaleNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= byfc_MultiFamilyResidentialLoanMember
Payments for Origination of Mortgage Loans Held-for-sale 12,600,000us-gaap_PaymentsForOriginationOfMortgageLoansHeldForSale
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= byfc_MultiFamilyResidentialLoanMember		  
Sale of loans $ 12,300,000us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= byfc_MultiFamilyResidentialLoanMember