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Note 11 - Regulatory Matters - Bank's Community Leverage Ratio (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Community Bank Leverage Ratio, actual amount	$ 159,779
Community Bank Leverage Ratio, actual ratio	11.23%	10.85%
Community Bank Leverage Ratio, required for capital adequacy purposes amount	$ 128,017	$ 133,577
Community Bank Leverage Ratio, required for capital adequacy purposes ratio	9.00%	9.00%
Operating Loss Carryforwards	$ 6,600,000	$ 161,037

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://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-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