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Note 11 - Regulatory Matters - Bank's Community Leverage Ratio (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Community Bank Leverage Ratio, actual amount	$ 165,599
Community Bank Leverage Ratio, actual ratio	9.91%	10.10%
Community Bank Leverage Ratio, required for capital adequacy purposes amount	$ 142,091	$ 126,964
Community Bank Leverage Ratio, required for capital adequacy purposes ratio	8.50%	8.00%
Operating Loss Carryforwards, Total		$ 160,236

X

- Definition

Represents minimum capital adequacy of community bank.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfin_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents actual community bank leverage ratio.

+ References

No definition available.

+ Details

Name:	bfin_CommunityBankLeverageRatioActual
Namespace Prefix:	bfin_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents actual amount of community bank leverage ratio.

+ References

No definition available.

+ Details

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

X

- Definition

Represents minimum capital adequacy of community bank leverage ratio.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319

+ Details

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Balance Type:	debit
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