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Note 4 - Loans Receivable - PPP activity (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Number of loans |  |  |  |  | 30
Loans receivable | $ 1,053,896 |  | $ 1,053,896 |  | $ 1,009,958
SBA CARES Act Paycheck Protection Program [Member] |  |  |  |  |
Number of loans originated | 0 | 10 | 238 | 315 |
Loan balance originations | $ 0 | $ 136 | $ 10,135 | $ 11,160 |
Loan balance forgiven | $ 4,801 | $ 0 | $ 14,538 | $ 117 |
Number of loans | 116 |  | 116 |  | 290
Loans receivable | $ 5,777 |  | $ 5,777 |  | $ 10,180

X
- Definition Amount of loans receivable that have been forgiven during period . + References No definition available. + Details
Name: | bfin_FinancingReceivableLoansForgivenDuringPeriod
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents originated amount of financing receivable loans. + References No definition available. + Details
Name: | bfin_FinancingReceivableLoansOriginatedAmount
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents number of loans under financing receivable. + References No definition available. + Details
Name: | bfin_FinancingReceivableNumberOfLoans
Namespace Prefix: | bfin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents number of loans originated for financing receivable. + References No definition available. + Details
Name: | bfin_FinancingReceivableNumberOfLoansOriginated
Namespace Prefix: | bfin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=bfin_SBACaresActPaycheckProtectionProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |