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Note 8 - Fair Value - Financial Assets At Fair Value on Non-recurring Basis (Details) - Real Estate Portfolio [Member] - Nonresidential Real Estate [Member] - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Impaired loans - nonresidential real estate, fair value	$ 268	$ 268
Fair Value, Inputs, Level 1 [Member]
Impaired loans - nonresidential real estate, fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans - nonresidential real estate, fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans - nonresidential real estate, fair value	$ 268	$ 268

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- Definition

Fair value portion of impaired financing receivable.

+ References

No definition available.

+ Details

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

X

- Details

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Data Type:	na
Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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- Details

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- Details

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