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Summary of Significant Accounting Policies (Details 5) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 item | Dec. 31, 2013 item | Jul. 31, 2013 | Dec. 31, 2012
Restrictions on Cash |  |  |  |
Amount of cash reserves with Federal Reserve Bank | $ 2,300,000 us-gaap_RestrictedCashAndCashEquivalents |  |  |
Operating Segments |  |  |  |
Number of active operating subsidiaries | 1 byfc_NumberOfActiveOperatingSubsidiaries | 1 byfc_NumberOfActiveOperatingSubsidiaries |  |
Number of reportable business segments | 1 us-gaap_NumberOfReportableSegments |  |  |
Adoption of New Accounting Standards |  |  |  |
Unrecognized tax benefits | $ 475,000 us-gaap_UnrecognizedTaxBenefits | $ 488,000 us-gaap_UnrecognizedTaxBenefits | $ 0 us-gaap_UnrecognizedTaxBenefits | $ 431,000 us-gaap_UnrecognizedTaxBenefits

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