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Note 13 - Loan Commitments and Other Off-balance-sheet Activities (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Commitments To Extend Credit, Duration Of Extension (Day)	60 days
Commitments to Extend Credit [Member]
Notional Or Contractual Credit, Extension Commitments, Fixed Interest Rate Loan	$ 23.1
Commitments to Extend Credit [Member] | Minimum [Member]
Notional Or Contractual Credit Extension Commitments, Fixed Interest Rate	2.65%
Notional Or Contractual Credit Extension Commitments, Loan Maturity (Year)	1 year
Commitments to Extend Credit [Member] | Maximum [Member]
Notional Or Contractual Credit Extension Commitments, Fixed Interest Rate	9.83%
Notional Or Contractual Credit Extension Commitments, Loan Maturity (Year)	30 years

X

- Definition

Represents duration of extension for commitments to extend credit.

+ References

No definition available.

+ Details

Name:	bfin_CommitmentsToExtendCreditDurationOfExtension
Namespace Prefix:	bfin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents fixed interest rate for national or contractual credit extension.

+ References

No definition available.

+ Details

Name:	bfin_NotionalOrContractualCreditExtensionCommitmentsFixedInterestRate
Namespace Prefix:	bfin_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents fixed interest rate loan for national or contractual credit of extension commitments.

+ References

No definition available.

+ Details

Name:	bfin_NotionalOrContractualCreditExtensionCommitmentsFixedInterestRateLoan
Namespace Prefix:	bfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents loan maturity for national or contractual credit extension commitments.

+ References

No definition available.

+ Details

Name:	bfin_NotionalOrContractualCreditExtensionCommitmentsLoanMaturity
Namespace Prefix:	bfin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: