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Recent Losses and Management Plans - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Net loss $ (326)us-gaap_NetIncomeLoss $ (176)us-gaap_NetIncomeLoss $ (1,416)us-gaap_NetIncomeLoss
Total risk-based capital ratio 19.20%us-gaap_CapitalToRiskWeightedAssets   15.50%us-gaap_CapitalToRiskWeightedAssets
Tier 1 leverage capital to average assets ratio 10.50%us-gaap_TierOneLeverageCapitalToAverageAssets   8.70%us-gaap_TierOneLeverageCapitalToAverageAssets
Cash balance $ 326us-gaap_Cash   $ 43us-gaap_Cash
Consent Order [Member] | Minimum [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total risk-based capital ratio   13.00%us-gaap_CapitalToRiskWeightedAssets
/ us-gaap_PublicUtilitiesRegulatoryProceedingAxis
= bffi_ConsentOrderMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Tier 1 leverage capital to average assets ratio   9.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_PublicUtilitiesRegulatoryProceedingAxis
= bffi_ConsentOrderMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember