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Note 14 - Fair Value (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Impaired Loans, Fair Value Disclosure | $ 297,000 | $ 296,000 |
Impaired Loans, Valuation Allowance | 30,000 | 28,000 |
Increase (Decrease) in Impaired Loans Valuation Allowance | 2,000 |  |
Foreclosed Assets, Gross | 952,000 | 0 |
Foreclosed Assets, Valuation Allowance | 227,000 | 0 | $ 0
Repossessed Assets, Total | 725,000 | 157,000 | $ 186,000
Foreclosed Assets Valuation Adjustments | (420,000) | $ (0) |
Impaired Loans [Member] |  |  |
Impaired Loans, Valuation Allowance | $ 28,000 |  |

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

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

X
- Definition The fair value portion of impaired loans. + References No definition available. + Details
Name: | bfin_ImpairedLoansFairValueDisclosure
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The amount of increase (decrease) of the recorded impaired loans valuation allowance during the reporting period. + References No definition available. + Details
Name: | bfin_IncreaseDecreaseInImpairedLoansValuationAllowance
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://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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |