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Regulatory Matters - Equity Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
GAAP equity $ 192,182bfin_GenerallyAcceptedAccountingPracticesShareholdersEquity $ 150,215bfin_GenerallyAcceptedAccountingPracticesShareholdersEquity
Disallowed goodwill and other intangible assets (1,855)us-gaap_IntangibleAssetsNetIncludingGoodwill (2,433)us-gaap_IntangibleAssetsNetIncludingGoodwill
Deferred Tax Assets, Net, Current (25,150)us-gaap_StatutoryAccountingPracticesStatutoryToGAAPAmountOfReconcilingItem  
Accumulated gain on securities (757)bfin_GaapToRegulatoryCapitalRequirementsReconcilingItemAccumulatedGainLossOnSaleOfSecurities (419)bfin_GaapToRegulatoryCapitalRequirementsReconcilingItemAccumulatedGainLossOnSaleOfSecurities
Tier 1 capital 164,420us-gaap_TierOneRiskBasedCapital 147,363us-gaap_TierOneRiskBasedCapital
General regulatory loan loss reserves allowed 11,990bfin_GeneralRegulatoryLoanLossReservesAllowed 13,476bfin_GeneralRegulatoryLoanLossReservesAllowed
Unrealized gains on securities available for sale allowed 4bfin_RegulatoryCapitalReconciliationAvailabeForSaleSecuritiesUnrealizedGainsAllowed 0bfin_RegulatoryCapitalReconciliationAvailabeForSaleSecuritiesUnrealizedGainsAllowed
Total regulatory capital $ 176,414us-gaap_Capital $ 160,839us-gaap_Capital