XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Loans Receivable - Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Unpaid Principal Balance | $ 2,793 | $ 4,097
Recorded Investment | 1,510 | 2,390
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 | 2,167 | 3,413
Recorded Investment | 1,162 | 1,918
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 | 270 | 308
Recorded Investment | 78 | 109
Loans Past Due Over 90 Days, still accruing | 0 | 0
Multi-family mortgage loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Unpaid Principal Balance |  | 376
Recorded Investment |  | 363
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 | 356 |
Recorded Investment | 270 |
Loans Past Due Over 90 Days, still accruing | $ 0 |

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

X
- 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
Name: | us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_OneToFourFamilyResidentialRealEstateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_OneToFourFamilyResidentialRealEstateLoansNonOwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bfin_MultiFamilyMortgageLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |