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Note 14 - Fair Value - Financial Assets At Fair Value on Non-recurring Basis (Details) - Real Estate Portfolio [Member] - Nonresidential Real Estate [Member] - Fair Value, Nonrecurring [Member] $ in Thousands	Dec. 31, 2020 USD ($)
Impaired loans, fair value	$ 268
Fair Value, Inputs, Level 1 [Member]
Impaired loans, fair value	0
Fair Value, Inputs, Level 2 [Member]
Impaired loans, fair value	0
Fair Value, Inputs, Level 3 [Member]
Impaired loans, fair value	$ 268

X

- Definition

Fair value portion of impaired financing receivable.

+ References

No definition available.

+ Details

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

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- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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- Details

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- Details

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- Details

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