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Note 5 - Foreclosed Assets- Roll Forward of Foreclosed Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Beginning balance | $ 2,332 | $ 1,393 | $ 2,777 | $ 476
New foreclosed assets | 0 | 0 | 49 | 921
Valuation reductions from sales | 44 | 0 | 111 | 0
Direct write-downs | 0 | (70) | (0) | (70)
Sales | (478) | (373) | (1,039) | (377)
Ending balance | $ 1,898 | $ 950 | $ 1,898 | $ 950

X
- Definition Additions of foreclosed assets. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsAdditions
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents disposals of foreclosed assets. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsDisposals
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of foreclosed assets valuation reductions from sales. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsValuationReductionsFromSales
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the write-down of foreclosed assets. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsWritedown
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
Name: | us-gaap_ForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant