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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, 2024	Dec. 31, 2023
Loan balance, with no allowance recorded	$ 21,768	$ 24,102
Recorded investment, with no allowance recorded	20,969	22,049
Partial charge-off, with no allowance recorded	560	469
Average investment in impaired loans, with no allowance recorded	21,139	16,618
Interest income recognized, with no allowance recorded	15	39
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	61	66
Recorded investment, with no allowance recorded	61	67
Partial charge-off, with no allowance recorded	0	0
Average investment in impaired loans, with no allowance recorded	62	76
Interest income recognized, with no allowance recorded	1	4
Commercial Loans [Member] | Real Estate Portfolio [Member]
Loan balance, with no allowance recorded	21,707	24,036
Commercial leases [Member] | Real Estate Portfolio [Member]
Recorded investment, with no allowance recorded	20,908	21,982
Partial charge-off, with no allowance recorded	560	469
Average investment in impaired loans, with no allowance recorded	21,077	16,542
Interest income recognized, with no allowance recorded	$ 14	$ 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

Name:	bfin_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment1
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

Name:	bfin_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod1
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

Name:	bfin_ImpairedFinancingReceivableWithNoRelatedAllowancePartialChargeOff
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

Name:	bfin_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment1
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

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_OnetoFourFamilyResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=bfin_RealEstatePortfolioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_CommercialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_CommercialLeasesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: