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Note 13 - Loan Commitments and Other Off-balance-sheet Activities (Details Textual) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Commitments To Extend Credit, Duration Of Extension (Day) | 60 days
Commitments to Extend Credit [Member] |
Notional Or Contractual Credit, Extension Commitments, Fixed Interest Rate Loan | $ 23.1
Commitments to Extend Credit [Member] | Minimum [Member] |
Notional Or Contractual Credit Extension Commitments, Fixed Interest Rate | 2.65%
Notional Or Contractual Credit Extension Commitments, Loan Maturity (Year) | 1 year
Commitments to Extend Credit [Member] | Maximum [Member] |
Notional Or Contractual Credit Extension Commitments, Fixed Interest Rate | 9.83%
Notional Or Contractual Credit Extension Commitments, Loan Maturity (Year) | 30 years

X
- Definition Represents duration of extension for commitments to extend credit. + References No definition available. + Details
Name: | bfin_CommitmentsToExtendCreditDurationOfExtension
Namespace Prefix: | bfin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents fixed interest rate for national or contractual credit extension. + References No definition available. + Details
Name: | bfin_NotionalOrContractualCreditExtensionCommitmentsFixedInterestRate
Namespace Prefix: | bfin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents fixed interest rate loan for national or contractual credit of extension commitments. + References No definition available. + Details
Name: | bfin_NotionalOrContractualCreditExtensionCommitmentsFixedInterestRateLoan
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents loan maturity for national or contractual credit extension commitments. + References No definition available. + Details
Name: | bfin_NotionalOrContractualCreditExtensionCommitmentsLoanMaturity
Namespace Prefix: | bfin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |