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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Loan balance, with no allowance recorded | $ 22,130 | $ 24,020
One-to-four family residential real estate | 17,012 | 22,049
Partial charge-off, with no allowance recorded | 5,192 | 450
Average investment in impaired loans, with no allowance recorded | 21,126 | 16,618
Interest income recognized, with no allowance recorded | 47 | 39
Commercial Portfolio Segment [Member] |  |
Loan balance, with no allowance recorded | 20,210 | 23,954
One-to-four family residential real estate | 15,018 | 21,982
Partial charge-off, with no allowance recorded | 5,192 | 450
Average investment in impaired loans, with no allowance recorded | 20,225 | 16,542
Interest income recognized, with no allowance recorded | 9 | 35
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member] |  |
Loan balance, with no allowance recorded | 138 | 66
One-to-four family residential real estate | 148 | 67
Partial charge-off, with no allowance recorded | 0 | 0
Average investment in impaired loans, with no allowance recorded | 66 | 76
Interest income recognized, with no allowance recorded | 7 |
Multi-family Mortgage [Member] | Real Estate Portfolio [Member] |  |
Loan balance, with no allowance recorded | 1,416 |
One-to-four family residential real estate | 1,453 |
Partial charge-off, with no allowance recorded | 0 |
Average investment in impaired loans, with no allowance recorded | 607 |
Interest income recognized, with no allowance recorded | 28 |
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |
Loan balance, with no allowance recorded | 366 |
One-to-four family residential real estate | 393 |
Partial charge-off, with no allowance recorded | 0 |
Average investment in impaired loans, with no allowance recorded | 228 |
Interest income recognized, with no allowance recorded | $ 3 |
Commercial Loans [Member] | Real Estate Portfolio [Member] |  |
Interest income recognized, with no allowance recorded |  | $ 4

X
- Definition Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses. + References No definition available. + Details
Name: | bfin_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment1
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired. + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of partial charge offs for impaired financing receivables for which there is no related allowance for credit losses + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References No definition available. + Details
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X
- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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