XML 99 R65.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Loans Receivable - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) contract | Dec. 31, 2019 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Valuation of reserves allocation | $ 23,000 |
Reserve For Uncollected Loan Interest | 72,000 | $ 81,000
Financing receivable modifications | 17,000 | 0
Outstanding Commitments To Borrowers Loans Classified As Troubled Debt Restructurings | 0 |
Increased value of allowances for loan losses | $ 0 |
Number of loans modified and classified as TDRs | contract | 0 |
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member] |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |
Valuation of reserves allocation | $ 0 | $ 0

X
- Definition Financing Receivable, Modifications, Subsequent Default, Increase In Allowance For Loan And Leases Losses + References No definition available. + Details
Name: | bfin_FinancingReceivableModificationsSubsequentDefaultIncreaseInAllowanceForLoanAndLeasesLosses
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Outstanding commitments to borrowers loans classified as troubled debt restructurings. + References No definition available. + Details
Name: | bfin_OutstandingCommitmentsToBorrowersLoansClassifiedAsTroubledDebtRestructurings
Namespace Prefix: | bfin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reserve for uncollected loan interest. + References No definition available. + Details
Name: | bfin_ReserveForUncollectedLoanInterest
Namespace Prefix: | bfin_
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: | srt_ValuationAndQualifyingAccountsDisclosureLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
Name: | us-gaap_ValuationAllowancesAndReservesBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_ValuationAllowancesAndReservesTypeAxis=us-gaap_AllowanceForLoanAndLeaseLossesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |