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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Loan balance, with no allowance recorded	$ 27,292	$ 27,292	$ 2,831
Recorded investment, with no allowance recorded	25,710	25,710	2,712
Partial charge-off, with no allowance recorded	1,538	1,538	49
Average investment in impaired loans, with no allowance recorded	24,617	14,131	2,178
Interest income recognized, with no allowance recorded	6	33	103
Commercial Portfolio Segment [Member]
Loan balance, with no allowance recorded			1,606
Recorded investment, with no allowance recorded			1,487
Partial charge-off, with no allowance recorded			49
Average investment in impaired loans, with no allowance recorded			445
Interest income recognized, with no allowance recorded			47
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	70	70	752
Recorded investment, with no allowance recorded	72	72	752
Partial charge-off, with no allowance recorded	0	0	0
Average investment in impaired loans, with no allowance recorded	73	78	1,143
Interest income recognized, with no allowance recorded	1	3	29
Commercial leases [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	27,222	27,222
Recorded investment, with no allowance recorded	25,638	25,638
Partial charge-off, with no allowance recorded	1,538	1,538
Average investment in impaired loans, with no allowance recorded	24,544	14,053
Interest income recognized, with no allowance recorded	$ 5	$ 30
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded			473
Recorded investment, with no allowance recorded			473
Partial charge-off, with no allowance recorded			0
Average investment in impaired loans, with no allowance recorded			590
Interest income recognized, with no allowance recorded			$ 27

X

- Definition

Amount of partial charge offs for impaired financing receivables for which there is no related allowance for credit losses

+ 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 average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-17

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X

- Definition

Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

Amount of investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-14A

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X

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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