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Note 4 - Loans Receivable - Recorded Investment in Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loan balance	$ 692	$ 1,226
Recorded investment	680	1,221
Loans past due over 90 days, still accruing	0	0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]
Loan balance	412	946
Recorded investment	384	925
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	296
Loans past due over 90 days, still accruing	$ 0	$ 0

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
Balance Type:	debit
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)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
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-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

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- Details

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- Details

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