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Note 4 - Loans Receivable - Recorded Investment in Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loan balance	$ 1,226	$ 925
Recorded investment	1,221	800
Loans past due over 90 days, still accruing	0	47
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loan balance	946	598
Recorded investment	925	512
Loans past due over 90 days, still accruing	0	0
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Loan balance	280	280
Recorded investment	296	288
Loans past due over 90 days, still accruing	$ 0	0
Commercial Portfolio Segment [Member]
Loan balance		47
Recorded investment		0
Loans past due over 90 days, still accruing		$ 47

X

- Definition

Amount of loan balance that is on nonaccrual status.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Amount of financing receivable 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (c)
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448

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X

- Definition

Amount of financing receivable on nonaccrual status.

+ References

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-Topic 310
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