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Note 7 - Fair Value - Financial Assets At Fair Value on Non-recurring Basis (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Other real estate owned, gross	$ 0	$ 472,000
Fair Value, Nonrecurring [Member] | One-to-Four Family Residential Real Estate [Member]
Other real estate owned, gross		405,000
Other foreclosed assets		387,000
Fair Value, Nonrecurring [Member] | One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Other real estate owned, gross		0
Other foreclosed assets		0
Fair Value, Nonrecurring [Member] | One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]
Other real estate owned, gross		0
Other foreclosed assets		0
Fair Value, Nonrecurring [Member] | One-to-Four Family Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Other real estate owned, gross		405,000
Other foreclosed assets		$ 387,000

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

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned, before valuation allowance.

+ References

No definition available.

+ Details

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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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