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Loans Receivable - Narrative (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Receivables [Abstract]
Reserve For Uncollected Loan Interest	$ 36,000		$ 103,000
Financing receivable modifications	17,000
Outstanding Commitments To Borrowers Loans Classified As Troubled Debt Restructurings	0		$ 0
Loans modified	$ 0	$ 149,000

X

- Definition

Outstanding commitments to borrowers loans classified as troubled debt restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfin_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Reserve for uncollected loan interest.

+ References

No definition available.

+ Details

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

X

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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- References

No definition available.

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