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Regulatory Capital Matters - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Common equity tier 1 capital to risk-weighted assets 4.50%bffi_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Total risk based capital ratio 13.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets 13.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets  
Tier one leverage capital ratio 9.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets 9.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets  
Description of prompt corrective action regulations provide The prompt corrective action regulations provide five classifications, including well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized, although these terms are not used to represent overall financial condition. If undercapitalized, asset growth and expansion are limited and plans for capital restoration are required.    
Capital conservation buffer 2.50%bffi_CapitalConservationBufferRequiredForCapitalAdequacy    
Community banks capital requirement $ 9,883us-gaap_Capital $ 8,510us-gaap_Capital  
Basel Three [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Common equity tier 1 capital to risk-weighted assets 4.50%bffi_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ us-gaap_RegulatoryAgencyAxis
= bffi_BaselThreeMember		    
Common equity tier 1 capital required to be well capitalized to risk-weighted assets 6.00%bffi_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_RegulatoryAgencyAxis
= bffi_BaselThreeMember		    
Minimum [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Total risk based capital ratio     13.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier one leverage capital ratio     9.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member] | One-Time-Aoci-Opt-Out-Election [Member]      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Community banks capital requirement $ 250,000,000us-gaap_Capital
/ us-gaap_PublicUtilitiesRegulatoryProceedingAxis
= bffi_OneTimeAociOptOutElectionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember