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Note 5 - Foreclosed Assets - Activity in the Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Beginning balance | $ 0 | $ 227
Additions charged to expense | 111 | 31
Reductions from sales | 0 | (258)
Ending balance | $ 111 | $ 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