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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Loan balance, with no allowance recorded	$ 21,634	$ 22,130
One-to-four family residential real estate	16,462	17,012
Partial charge-off, with no allowance recorded	5,227	5,192
Average investment in impaired loans, with no allowance recorded	16,593	21,126
Interest income recognized, with no allowance recorded	1	47
Commercial Portfolio Segment [Member]
Loan balance, with no allowance recorded	20,169	20,210
One-to-four family residential real estate	14,941	15,018
Partial charge-off, with no allowance recorded	5,227	5,192
Average investment in impaired loans, with no allowance recorded	15,027	20,225
Interest income recognized, with no allowance recorded	1	9
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	123	138
One-to-four family residential real estate	126	148
Partial charge-off, with no allowance recorded	0	0
Average investment in impaired loans, with no allowance recorded	127	66
Interest income recognized, with no allowance recorded	0	7
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	1,342	1,416
One-to-four family residential real estate	1,395	1,453
Partial charge-off, with no allowance recorded	0	0
Average investment in impaired loans, with no allowance recorded	1,439	607
Interest income recognized, with no allowance recorded	$ 0	28
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded		366
One-to-four family residential real estate		393
Partial charge-off, with no allowance recorded		0
Average investment in impaired loans, with no allowance recorded		228
Interest income recognized, with no allowance recorded		$ 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_
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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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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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