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Note 5 - Foreclosed Assets - Activity in the Valuation Allowance (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Beginning balance | $ 227,000 | $ 0
Reductions from sales | (8,000) | 0
Ending balance | $ 219,000 | $ 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