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Securities (Details 2) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Amortized Cost    
One to five years $ 1,932,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis  
Residential mortgage-backed 14,578,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost  
Total 16,510,000us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Fair Value    
One to five years 1,957,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue  
Residential mortgage-backed 15,118,000us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Total 17,075,000us-gaap_AvailableForSaleSecuritiesDebtSecurities  
Securities pledged 1,200,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral 9,400,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Securities of any one issuer, other than U.S. Government, greater than 10% of shareholders equity 0byfc_AvailableForSaleSecuritiesOfAnyOneIssuerGreaterThanTenPercentOfShareholdersEquity 0byfc_AvailableForSaleSecuritiesOfAnyOneIssuerGreaterThanTenPercentOfShareholdersEquity
Shareholders equity representing a concentration risk for any one securities investment (as a percent) 10.00%byfc_ShareholdersEquityPercentageRepresentingConcentrationRiskForSecuritiesInvestment  
Purchase of available for sale securities 10,463,000us-gaap_PaymentsToAcquireAvailableForSaleSecurities  
Sales of securities $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds $ 0us-gaap_AvailableForSaleSecuritiesGrossRealizedGainsLossesSaleProceeds