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Note 14 - Fair Value (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Impaired Loans, Fair Value Disclosure	$ 297,000	$ 296,000
Impaired Loans, Valuation Allowance	30,000	28,000
Increase (Decrease) in Impaired Loans Valuation Allowance	2,000
Foreclosed Assets, Gross	952,000	0
Foreclosed Assets, Valuation Allowance	227,000	0	$ 0
Repossessed Assets, Total	725,000	157,000	$ 186,000
Foreclosed Assets Valuation Adjustments	(420,000)	$ (0)
Impaired Loans [Member]
Impaired Loans, Valuation Allowance	$ 28,000

X

- Definition

Represents gross amount of foreclosed assets before valuation allowance.

+ References

No definition available.

+ Details

Name:	bfin_ForeclosedAssetsGross
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents valuation adjustments of foreclosed assets.

+ References

No definition available.

+ Details

Name:	bfin_ForeclosedAssetsValuationAdjustments
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents valuation allowance of foreclosed assets.

+ References

No definition available.

+ Details

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

X

- Definition

The fair value portion of impaired loans.

+ References

No definition available.

+ Details

Name:	bfin_ImpairedLoansFairValueDisclosure
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents valuation allowance of impaired loans.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of increase (decrease) of the recorded impaired loans valuation allowance during the reporting period.

+ References

No definition available.

+ Details

Name:	bfin_IncreaseDecreaseInImpairedLoansValuationAllowance
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4437-111522

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_ImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: