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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Loan balance, with no allowance recorded	$ 22,130	$ 24,020
One-to-four family residential real estate	17,012	22,049
Partial charge-off, with no allowance recorded	5,192	450
Average investment in impaired loans, with no allowance recorded	21,126	16,618
Interest income recognized, with no allowance recorded	47	39
Commercial Portfolio Segment [Member]
Loan balance, with no allowance recorded	20,210	23,954
One-to-four family residential real estate	15,018	21,982
Partial charge-off, with no allowance recorded	5,192	450
Average investment in impaired loans, with no allowance recorded	20,225	16,542
Interest income recognized, with no allowance recorded	9	35
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	138	66
One-to-four family residential real estate	148	67
Partial charge-off, with no allowance recorded	0	0
Average investment in impaired loans, with no allowance recorded	66	76
Interest income recognized, with no allowance recorded	7
Multi-family Mortgage [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	1,416
One-to-four family residential real estate	1,453
Partial charge-off, with no allowance recorded	0
Average investment in impaired loans, with no allowance recorded	607
Interest income recognized, with no allowance recorded	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
Commercial Loans [Member] | Real Estate Portfolio [Member]
Interest income recognized, with no allowance recorded		$ 4

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_
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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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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_
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Balance Type:	debit
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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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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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X

- Details

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X

- Details

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X

- Details

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- Details

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- Details

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- Details

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