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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, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Loan balance, with no allowance recorded | $ 1,324 | $ 1,324 | $ 22,130
Recorded investment, with no allowance recorded | 913 | 913 | 17,012
Partial charge-off, with no allowance recorded | 408 | 408 | 5,192
Average investment in impaired loans, with no allowance recorded | 896 | 8,170 | 21,126
Interest income recognized, with no allowance recorded | 2 | 7 | 47
Allowance recorded | 2,075 | 2,075 |
Loan balance | 9,745 | 9,745 |
Recorded investment | 9,334 | 9,334 |
Partial charge-off | 408 | 408 |
Average investment in impaired loans | 9,317 | 11,913 |
Interest income recognized | 2 | 7 |
Commercial Portfolio Segment [Member] |  |  |
Loan balance, with no allowance recorded | 1,297 | 1,297 | 20,210
Recorded investment, with no allowance recorded | 886 | 886 | 15,018
Partial charge-off, with no allowance recorded | 408 | 408 | 5,192
Average investment in impaired loans, with no allowance recorded | 868 | 8,098 | 20,225
Interest income recognized, with no allowance recorded | 2 | 6 | 9
Loan balance, with allowance recorded | 8,421 | 8,421 |
Recorded investment, with allowance recorded | 8,421 | 8,421 |
Partial charge-off, with allowance recorded | 0 | 0 |
Allowance recorded | 2,075 | 2,075 |
Average investment in impaired loans, with allowance recorded | 8,421 | 3,743 |
Interest income recognized, with allowance recorded | 0 | 0 |
One To Four Family Residential Real Estate Loans [Member] | Real Estate Portfolio [Member] |  |  |
Loan balance, with no allowance recorded | 27 | 27 |
Recorded investment, with no allowance recorded | 27 | 27 |
Partial charge-off, with no allowance recorded | 0 | 0 |
Average investment in impaired loans, with no allowance recorded | 28 | 72 |
Interest income recognized, with no allowance recorded | $ 0 | $ 1 |
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |
Loan balance, with no allowance recorded |  |  | 138
Recorded investment, with no allowance recorded |  |  | 148
Partial charge-off, with no allowance recorded |  |  | 0
Average investment in impaired loans, with no allowance recorded |  |  | 66
Interest income recognized, with no allowance recorded |  |  | 7
Multi-family Mortgage [Member] | Real Estate Portfolio [Member] |  |  |
Loan balance, with no allowance recorded |  |  | 1,416
Recorded investment, with no allowance recorded |  |  | 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
Recorded investment, with no allowance recorded |  |  | 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

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
Name: | bfin_ImpairedFinancingReceivableAverageRecordedInvestment1
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References No definition available. + Details
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Namespace Prefix: | bfin_
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X
- Definition Amount of balance of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition The amount of partial charge offs for impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References No definition available. + Details
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- Definition Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses. + References No definition available. + Details
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- 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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- 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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- 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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- 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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- Definition Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses. + References No definition available. + Details
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- Definition Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired. + References No definition available. + Details
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- Definition Amount of balance in impaired financing receivables for which there is a related allowance for credit losses. + References No definition available. + Details
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- Definition The amount of partial charge offs for impaired financing receivables with related allowance for credit losses. + References No definition available. + Details
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