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

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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