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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Loan balance, with no allowance recorded	$ 21,715	$ 21,715	$ 24,020
Recorded investment, with no allowance recorded	20,978	20,978	22,049
Partial charge-off, with no allowance recorded	537	537	450
Average investment in impaired loans, with no allowance recorded	20,768	20,953	16,618
Interest income recognized, with no allowance recorded	2	19	39
Loan balance, with no allowance recorded	21,715	21,715	24,020
Recorded investment, with no allowance recorded	20,978	20,978	22,049
Average investment in impaired loans, with no allowance recorded	20,768	20,953	16,618
Interest income recognized, with no allowance recorded	2	19	39
Commercial Portfolio Segment [Member]
Loan balance, with no allowance recorded	21,293	21,293
Recorded investment, with no allowance recorded	20,541	20,541
Partial charge-off, with no allowance recorded	537	537
Average investment in impaired loans, with no allowance recorded	20,583	20,830
Interest income recognized, with no allowance recorded	1	15
Loan balance, with no allowance recorded	21,293	21,293
Recorded investment, with no allowance recorded	20,541	20,541
Average investment in impaired loans, with no allowance recorded	20,583	20,830
Interest income recognized, with no allowance recorded	1	15
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	56	56	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	1	4
Loan balance, with no allowance recorded	56	56	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	1	4
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	366	366
Recorded investment, with no allowance recorded	380	380
Partial charge-off, with no allowance recorded	0	0
Average investment in impaired loans, with no allowance recorded	127	63
Interest income recognized, with no allowance recorded	0	3
Loan balance, with no allowance recorded	366	366
Recorded investment, with no allowance recorded	380	380
Average investment in impaired loans, with no allowance recorded	127	63
Interest income recognized, with no allowance recorded	$ 0	$ 3
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

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
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

Name:	bfin_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance1
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: