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Note 5 - Foreclosed Assets (Details Textual) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Real Estate Owned and Other Foreclosed Assets, Valuation Allowance, Ending Balance	$ 0	$ (0)
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Total	4,630,000	157,000
Mortgage Loans in Process of Foreclosure, Amount	158,000	187,000
Foreclosed Residential Real Estate Properties, Physical Possession Without Title [Member]
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Total	$ 0	$ 0

X

- Definition

Represents valuation allowance for both real estate owned and other foreclosed assets.

+ References

No definition available.

+ Details

Name:	bfin_RealEstateOwnedAndOtherForeclosedAssetsValuationAllowanceEndingBalance
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL49126937-111524

+ Details

Name:	us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=bfin_ForeclosedResidentialRealEstatePropertiesPhysicalPossessionWithoutTitleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: