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Note 11 - Regulatory Matters - Bank's Community Leverage Ratio (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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Community Bank Leverage Ratio, actual amount | $ 165,599 |
Community Bank Leverage Ratio, actual ratio | 9.91% | 10.10%
Community Bank Leverage Ratio, required for capital adequacy purposes amount | $ 142,091 | $ 126,964
Community Bank Leverage Ratio, required for capital adequacy purposes ratio | 8.50% | 8.00%
Operating Loss Carryforwards, Total |  | $ 160,236

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- Definition Represents minimum capital adequacy of community bank. + References No definition available. + Details
Name: | bfin_CommunityBankCapitalAdequacyMinimum
Namespace Prefix: | bfin_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents actual community bank leverage ratio. + References No definition available. + Details
Name: | bfin_CommunityBankLeverageRatioActual
Namespace Prefix: | bfin_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Represents actual amount of community bank leverage ratio. + References No definition available. + Details
Name: | bfin_CommunityBankLeverageRatioActualAmount
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents minimum capital adequacy of community bank leverage ratio. + References No definition available. + Details
Name: | bfin_CommunityBankLeverageRatioCapitalAdequacyMinimum
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant