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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Loan balance, with no allowance recorded | $ 23,591 | $ 23,591 | $ 24,020
Recorded investment, with no allowance recorded | 22,473 | 22,473 | 22,049
Partial charge-off, with no allowance recorded | 1,193 | 1,193 | 450
Average investment in impaired loans, with no allowance recorded | 22,052 | 21,320 | 16,618
Interest income recognized, with no allowance recorded | 3 | 43 | 39
Loan balance, with no allowance recorded | 23,591 | 23,591 | 24,020
Recorded investment, with no allowance recorded | 22,473 | 22,473 | 22,049
Average investment in impaired loans, with no allowance recorded | 22,052 | 21,320 | 16,618
Interest income recognized, with no allowance recorded | 3 | 43 | 39
Commercial Portfolio Segment [Member] |  |  |
Loan balance, with no allowance recorded | 21,758 | 21,758 |
Recorded investment, with no allowance recorded | 20,565 | 20,565 |
Partial charge-off, with no allowance recorded | 1,193 | 1,193 |
Average investment in impaired loans, with no allowance recorded | 20,629 | 20,763 |
Interest income recognized, with no allowance recorded | 2 | 11 |
Loan balance, with no allowance recorded | 21,758 | 21,758 |
Recorded investment, with no allowance recorded | 20,565 | 20,565 |
Average investment in impaired loans, with no allowance recorded | 20,629 | 20,763 |
Interest income recognized, with no allowance recorded | 2 | 11 |
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |
Loan balance, with no allowance recorded | 51 | 51 | 66
Recorded investment, with no allowance recorded | 57 | 57 | 67
Partial charge-off, with no allowance recorded | 0 | 0 | 0
Average investment in impaired loans, with no allowance recorded | 58 | 60 | 76
Interest income recognized, with no allowance recorded | 1 | 2 | 4
Loan balance, with no allowance recorded | 51 | 51 | 66
Recorded investment, with no allowance recorded | 57 | 57 | 67
Average investment in impaired loans, with no allowance recorded | 58 | 60 | 76
Interest income recognized, with no allowance recorded | 1 | 2 | 4
Multi-family Mortgage [Member] | Real Estate Portfolio [Member] |  |  |
Loan balance, with no allowance recorded | 1,416 | 1,416 |
Recorded investment, with no allowance recorded | 1,458 | 1,458 |
Partial charge-off, with no allowance recorded | 0 | 0 |
Average investment in impaired loans, with no allowance recorded | 972 | 324 |
Interest income recognized, with no allowance recorded | 0 | 27 |
Loan balance, with no allowance recorded | 1,416 | 1,416 |
Recorded investment, with no allowance recorded | 1,458 | 1,458 |
Average investment in impaired loans, with no allowance recorded | 972 | 324 |
Interest income recognized, with no allowance recorded | 0 | 27 |
Commercial Loans [Member] | Real Estate Portfolio [Member] |  |  |
Loan balance, with no allowance recorded |  |  | 23,954
Loan balance, with no allowance recorded |  |  | 23,954
Commercial leases [Member] | Real Estate Portfolio [Member] |  |  |
Recorded investment, with no allowance recorded |  |  | 21,982
Partial charge-off, with no allowance recorded |  |  | 450
Average investment in impaired loans, with no allowance recorded |  |  | 16,542
Interest income recognized, with no allowance recorded |  |  | 35
Recorded investment, with no allowance recorded |  |  | 21,982
Average investment in impaired loans, with no allowance recorded |  |  | 16,542
Interest income recognized, with no allowance recorded |  |  | $ 35
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |
Loan balance, with no allowance recorded | 366 | 366 |
Recorded investment, with no allowance recorded | 393 | 393 |
Partial charge-off, with no allowance recorded | 0 | 0 |
Average investment in impaired loans, with no allowance recorded | 393 | 173 |
Interest income recognized, with no allowance recorded | 0 | 3 |
Loan balance, with no allowance recorded | 366 | 366 |
Recorded investment, with no allowance recorded | 393 | 393 |
Average investment in impaired loans, with no allowance recorded | 393 | 173 |
Interest income recognized, with no allowance recorded | $ 0 | $ 3 |

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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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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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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