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Note 8 - Fair Value - Quantitative Information for Financial Instruments on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Foreclosed assets	$ 1,568
Fair Value, Inputs, Level 3 [Member]
Foreclosed assets	1,568
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Foreclosed assets	$ 140
Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member]
Foreclosed assets, measurement input	0.118
One-to-Four Family Residential Real Estate [Member]
Foreclosed assets	$ 258
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Foreclosed assets	$ 258
One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member]
Foreclosed assets, measurement input	0.199
Other Foreclosed Assets [Member]
Foreclosed assets	$ 1,170
Other Foreclosed Assets [Member] | Fair Value, Inputs, Level 3 [Member]
Foreclosed assets	$ 1,170
Other Foreclosed Assets [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member]
Foreclosed assets, measurement input	0.266
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]
Impaired loans - nonresidential real estate, fair value	$ 268	$ 268
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Impaired loans - nonresidential real estate, fair value	$ 268	$ 268
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Measurement Input, Discount Rate [Member]
Imapired loans, measurement input	0.220	0.220

X

- Definition

Represents fair value of foreclosed assets.

+ References

No definition available.

+ Details

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

X

- Definition

Represents measurement input for foreclosed assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfin_
Data Type:	xbrli:decimalItemType
Balance Type:	na
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
Balance Type:	debit
Period Type:	instant

X

- Definition

Value of input used to measure impaired financing receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	bfin_
Data Type:	xbrli:decimalItemType
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- 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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- Details

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- Details

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