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Loans Receivable - Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Reserve For Uncollected Loan Interest | $ 120 | $ 72
Unpaid Principal Balance | 1,740 | 2,793
Recorded Investment | 1,442 | 1,510
Loans Past Due Over 90 Days, still accruing | 0 | 0
One-to-four family residential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Unpaid Principal Balance | 1,460 | 2,167
Recorded Investment | 1,160 | 1,162
Loans Past Due Over 90 Days, still accruing | 0 | 0
One-to-four family residential real estate loans - non-owner occupied loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Unpaid Principal Balance | 0 | 270
Recorded Investment | 0 | 78
Loans Past Due Over 90 Days, still accruing | 0 | 0
Wholesale Commercial Lending [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Unpaid Principal Balance |  | 356
Loans Past Due Over 90 Days, still accruing |  | 0
Nonresidential real estate loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Unpaid Principal Balance | 280 |
Recorded Investment | 282 | $ 270
Loans Past Due Over 90 Days, still accruing | $ 0 |

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- Definition Financing Receivable, Nonaccrual + References No definition available. + Details
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Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reserve for uncollected loan interest. + References No definition available. + Details
Name: | bfin_ReserveForUncollectedLoanInterest
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Financing receivables that are current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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Balance Type: | debit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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