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Note 11 - Regulatory Matters - Bank's Community Leverage Ratio (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Community Bank Leverage Ratio, actual amount	$ 161,037
Community Bank Leverage Ratio, actual ratio	10.85%	10.31%
Community Bank Leverage Ratio, required for capital adequacy purposes amount	$ 133,577	$ 144,288
Community Bank Leverage Ratio, required for capital adequacy purposes ratio	9.00%	9.00%
Operating Loss Carryforwards	$ 6,700,000	$ 165,252

X

- Definition

Represents minimum capital adequacy of community bank.

+ References

No definition available.

+ Details

Name:	bfin_CommunityBankCapitalAdequacyMinimum
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
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

+ Details

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