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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, 2024	Sep. 30, 2024	Dec. 31, 2023
Loan balance, with no allowance recorded	$ 23,591	$ 23,591	$ 24,020
Recorded investment, with no allowance recorded	22,473	22,473	22,049
Partial charge-off, with no allowance recorded	1,193	1,193	450
Average investment in impaired loans, with no allowance recorded	22,052	21,320	16,618
Interest income recognized, with no allowance recorded	3	43	39
Loan balance, with no allowance recorded	23,591	23,591	24,020
Recorded investment, with no allowance recorded	22,473	22,473	22,049
Average investment in impaired loans, with no allowance recorded	22,052	21,320	16,618
Interest income recognized, with no allowance recorded	3	43	39
Commercial Portfolio Segment [Member]
Loan balance, with no allowance recorded	21,758	21,758
Recorded investment, with no allowance recorded	20,565	20,565
Partial charge-off, with no allowance recorded	1,193	1,193
Average investment in impaired loans, with no allowance recorded	20,629	20,763
Interest income recognized, with no allowance recorded	2	11
Loan balance, with no allowance recorded	21,758	21,758
Recorded investment, with no allowance recorded	20,565	20,565
Average investment in impaired loans, with no allowance recorded	20,629	20,763
Interest income recognized, with no allowance recorded	2	11
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	51	51	66
Recorded investment, with no allowance recorded	57	57	67
Partial charge-off, with no allowance recorded	0	0	0
Average investment in impaired loans, with no allowance recorded	58	60	76
Interest income recognized, with no allowance recorded	1	2	4
Loan balance, with no allowance recorded	51	51	66
Recorded investment, with no allowance recorded	57	57	67
Average investment in impaired loans, with no allowance recorded	58	60	76
Interest income recognized, with no allowance recorded	1	2	4
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	1,416	1,416
Recorded investment, with no allowance recorded	1,458	1,458
Partial charge-off, with no allowance recorded	0	0
Average investment in impaired loans, with no allowance recorded	972	324
Interest income recognized, with no allowance recorded	0	27
Loan balance, with no allowance recorded	1,416	1,416
Recorded investment, with no allowance recorded	1,458	1,458
Average investment in impaired loans, with no allowance recorded	972	324
Interest income recognized, with no allowance recorded	0	27
Commercial Loans [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded			23,954
Loan balance, with no allowance recorded			23,954
Commercial leases [Member] | Real Estate Portfolio [Member]
Recorded investment, with no allowance recorded			21,982
Partial charge-off, with no allowance recorded			450
Average investment in impaired loans, with no allowance recorded			16,542
Interest income recognized, with no allowance recorded			35
Recorded investment, with no allowance recorded			21,982
Average investment in impaired loans, with no allowance recorded			16,542
Interest income recognized, with no allowance recorded			$ 35
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	366	366
Recorded investment, with no allowance recorded	393	393
Partial charge-off, with no allowance recorded	0	0
Average investment in impaired loans, with no allowance recorded	393	173
Interest income recognized, with no allowance recorded	0	3
Loan balance, with no allowance recorded	366	366
Recorded investment, with no allowance recorded	393	393
Average investment in impaired loans, with no allowance recorded	393	173
Interest income recognized, with no allowance recorded	$ 0	$ 3

X

- Definition

Amount of average investment of 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:	duration

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

No definition available.

+ Details

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

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 investment in 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
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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

No definition available.

+ Details

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Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
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X

- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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- Details

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- Details

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X

- Details

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X

- Details

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