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Note 5 - Foreclosed Assets- Roll Forward of Foreclosed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Beginning balance	$ 476	$ 725
New foreclosed assets	2,859	791
Valuation adjustments	(111)	(31)
Valuation reductions from sales	0	258
Direct write-downs	(70)	(0)
Sales	(377)	(1,267)
Ending balance	$ 2,777	$ 476

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

Represents the write-down of foreclosed assets.

+ References

No definition available.

+ Details

Name:	bfin_ForeclosedAssetsWritedown
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://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11

+ Details

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