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Note 4 - Loans Receivable - PPP activity (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Number of loans					30
Loans receivable	$ 1,039,161		$ 1,039,161		$ 1,009,958
SBA CARES Act Paycheck Protection Program [Member]
Number of loans originated	45	305	238	305
Loan balance originations	$ 1,511	$ 11,024	$ 10,135	$ 11,024
Loan balance forgiven	$ 1,834	$ 117	$ 9,737	$ 117
Number of loans	248		248		290
Loans receivable	$ 10,579		$ 10,579		$ 10,180

X

- Definition

Amount of loans receivable that have been forgiven during period .

+ References

No definition available.

+ Details

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

X

- Definition

Represents originated amount of financing receivable loans.

+ References

No definition available.

+ Details

Name:	bfin_FinancingReceivableLoansOriginatedAmount
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents number of loans under financing receivable.

+ References

No definition available.

+ Details

Name:	bfin_FinancingReceivableNumberOfLoans
Namespace Prefix:	bfin_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents number of loans originated for financing receivable.

+ References

No definition available.

+ Details

Name:	bfin_FinancingReceivableNumberOfLoansOriginated
Namespace Prefix:	bfin_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

+ Details

Name:	us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=bfin_SBACaresActPaycheckProtectionProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: