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Note 13 - Loan Commitments and Other Off-balance-sheet Activities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Commitments to Extend Credit [Member]
Notional Or Contractual Credit Extension Commitments	$ 31,131	$ 19,737
Standby Letters of Credit [Member]
Notional Or Contractual Credit Extension Commitments	6,668	6,119
Unused lines of Credit [Member]
Notional Or Contractual Credit Extension Commitments	$ 200,240	$ 149,771

X

- Definition

Represents information related to national or contractual credit extension commitments.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

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