XML 38 R28.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Securities - Fair Value of Securites (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Unrealized gains and losses recognized in accumulated other comprehensive income (loss) |  |
Amortized Cost | $ 112,069 | $ 92,876
Gross Unrealized Gains | 443 | 536
Gross Unrealized Losses | (60) | (29)
Total Fair value | 112,452 | 93,383
Certificates of deposit [Member] |  |
Unrealized gains and losses recognized in accumulated other comprehensive income (loss) |  |
Amortized Cost | 96,603 | 75,916
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Total Fair value | 96,603 | 75,916
Equity mutual fund [Member] |  |
Unrealized gains and losses recognized in accumulated other comprehensive income (loss) |  |
Amortized Cost |  | 500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Total Fair value | 0 | 499
Mortgage - backed securities - residential [Member] |  |
Unrealized gains and losses recognized in accumulated other comprehensive income (loss) |  |
Amortized Cost | 11,431 | 11,969
Gross Unrealized Gains | 429 | 520
Gross Unrealized Losses | (49) | (17)
Total Fair value | 11,811 | 12,472
Collateralized mortgage obligations - residential [Member] |  |
Unrealized gains and losses recognized in accumulated other comprehensive income (loss) |  |
Amortized Cost | 4,028 | 4,481
Gross Unrealized Gains | 14 | 16
Gross Unrealized Losses | (11) | (11)
Total Fair value | 4,031 | 4,486
SBA-guaranteed loan participation certificates [Member] |  |
Unrealized gains and losses recognized in accumulated other comprehensive income (loss) |  |
Amortized Cost | 7 | 10
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Total Fair value | $ 7 | $ 10

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_EquityFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedDebtObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=bfin_SbaGuaranteedLoanParticipationCertificatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |