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Note 7 - Leases - Classification of Right of Use and Lease Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Gross carrying amount | $ 9,025 | $ 7,671
New lease obligation | 592 | 1,354
Accumulated amortization | (6,103) | (5,082)
Net recorded value | 3,514 | 3,943
Right of use lease obligations | $ 3,514 | $ 3,943

X
- Definition Amount of accumulated amortization of right-of-use asset under operating lease. + References No definition available. + Details
Name: | bfin_OperatingLeaseRightOfUseAssetAccumulatedAmortization
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease, before accumulated amortization. + References No definition available. + Details
Name: | bfin_OperatingLeaseRightOfUseAssetGross
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents amount of right-of-use asset obtained in exchange for lease obligations in other assets and other liabilities. + References No definition available. + Details
Name: | bfin_RightofuseAssetObtainedInExchangeForLeaseObligationsInOtherAssetsAndOtherLiabilities
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant