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Note 5 - Foreclosed Assets- Roll Forward of Foreclosed Assets (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Beginning balance	$ 725,000	$ 157,000
New foreclosed properties	791,000	4,473,000
Valuation adjustments	(31,000)	(420,000)
Valuation reductions from sales	258,000	193,000
Sales	(1,267,000)	(3,678,000)
Ending balance	$ 476,000	$ 725,000

X

- Definition

Additions of foreclosed assets.

+ References

No definition available.

+ Details

Name:	bfin_ForeclosedAssetsAdditions
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents disposals of foreclosed assets.

+ References

No definition available.

+ Details

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

X

- Definition

Represents valuation increase during period for foreclosed assets.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of foreclosed assets valuation reductions from sales.

+ References

No definition available.

+ Details

Name:	bfin_ForeclosedAssetsValuationReductionsFromSales
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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 https://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 https://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