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Note 5 - Foreclosed Assets - Real Estate Acquired Through Foreclosure (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Other foreclosed assets, gross | $ 45 | $ 1,391
Other foreclosed assets, valuation allowance | 0 | 0
Other foreclosed assets | $ 45 | $ 1,391

X
- Definition Represents gross amount of other foreclosed assets. + References No definition available. + Details
Name: | bfin_OtherForeclosedAssetsGross
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents valuation allowance of other foreclosed assets. + References No definition available. + Details
Name: | bfin_OtherForeclosedAssetsValuationAllowanceEndingBalance
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Carrying amount as of the balance sheet date of assets other than real property that were received in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-3 + Details
Name: | us-gaap_OtherForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant