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Note 5 - Foreclosed Assets- Roll Forward of Foreclosed Assets (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Beginning balance | $ 1,702,000 | $ 143,000 | $ 157,000 | $ 186,000
New foreclosed assets | 0 | 0 | 4,473,000 | 33,000
Valuation adjustments | (124,000) | 0 | (405,000) | (0)
Valuation reductions from sales | 69,000 | 0 | 69,000 | 0
Sales | (598,000) | (33,000) | (3,245,000) | (109,000)
Ending balance | $ 1,049,000 | $ 110,000 | $ 1,049,000 | $ 110,000

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 Represents valuation adjustments of foreclosed assets. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsValuationAdjustments
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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4437-111522 + Details
Name: | us-gaap_ForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant