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Note 5 - Foreclosed Assets - Activity in the Valuation Allowance (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Beginning balance | $ 0 | $ 0 | $ 0 | $ 0
Additions charged to expense | 281,000 | 0 | 281,000 | 0
Reductions from sales | 0 | 0 | 0 | 0
Ending balance | $ 281,000 | $ 0 | $ 281,000 | $ 0

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 Amount of the valuation allowance for foreclosed assets that was applied in the period against the carrying amount of foreclosed assets that was sold, written down or written off. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsValuationAllowanceAmountsApplied
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of gain recognized in the income statement for an increase in valuation of foreclosed assets. + References No definition available. + Details
Name: | bfin_ForeclosedAssetsValuationAllowanceValuationIncrease
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration