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Note 4 - Loans Receivable - PPP activity (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Loans receivable	$ 1,148,334		$ 1,148,334		$ 1,050,638
SBA CARES Act Paycheck Protection Program [Member]
Number of loans originated	0	0	0	238
Loan balance originations	$ 0	$ 0	$ 0	$ 10,135
Loan balance forgiven	$ 629	$ 4,801	$ 3,761	$ 14,538
Number of loans	11		11		76
Loans receivable	$ 282		$ 282		$ 4,043

X

- Definition

Amount of loans receivable that have been forgiven during period .

+ References

No definition available.

+ Details

Name:	bfin_FinancingReceivableLoansForgivenDuringPeriod
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 https://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: