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Note 14 - Fair Value - Financial Assets At Fair Value on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
One-to-Four Family Residential Real Estate [Member]
Foreclosed assets		$ 268
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	$ 267
Fair Value, Inputs, Level 1 [Member] | One-to-Four Family Residential Real Estate [Member]
Foreclosed assets		0
Fair Value, Inputs, Level 1 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	0
Fair Value, Inputs, Level 2 [Member] | One-to-Four Family Residential Real Estate [Member]
Foreclosed assets		0
Fair Value, Inputs, Level 2 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	0
Fair Value, Inputs, Level 3 [Member] | One-to-Four Family Residential Real Estate [Member]
Foreclosed assets		$ 268
Fair Value, Inputs, Level 3 [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	$ 267

X

- Definition

Represents fair value of foreclosed assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfin_
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Balance Type:	debit
Period Type:	instant

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
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X

- Details

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- Details

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- Details

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- Details

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- Details

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