XML 55 R44.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Fair Value of Assets and Liabilities (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Collateral-dependent impaired loans [Member] | Comparability adjustments (%) [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 237 | $ 982
Fair Value Measurements, Valuation Technique | Market comparable properties | Market comparable properties
Fair Value Measurements, Unobservable Inputs | Comparability adjustments (%) | Comparability adjustments (%)
Fair Value Measurements, Range | 20.00% |
Mortgage servicing rights [Member] | Discount Rate [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 754 | $ 1,490
Fair Value Measurements, Valuation Technique | Discounted cash flow | Discounted cash flow
Fair Value Measurements, Unobservable Inputs | Discount Rate | Discount Rate
Fair Value Measurements, Range | 10.15% | 9.65%
Mortgage servicing rights [Member] | Constant prepayment rate [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements |  |
Fair Value Measurements, Unobservable Inputs | Constant prepayment rate | Constant prepayment rate
Fair Value Measurements, Range | 6.39% | 7.51%
Mortgage servicing rights [Member] | P&I earnings credit [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements |  |
Fair Value Measurements, Unobservable Inputs | P&I earnings credit | P&I earnings credit
Fair Value Measurements, Range | 1.88% | 1.56%
Mortgage servicing rights [Member] | T&I earnings credit [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements |  |
Fair Value Measurements, Unobservable Inputs | T&I earnings credit | T&I earnings credit
Fair Value Measurements, Range | 2.62% | 2.13%
Mortgage servicing rights [Member] | Inflation for cost of servicing [Member] |  |
Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements |  |
Fair Value Measurements, Unobservable Inputs | Inflation for cost of servicing | Inflation for cost of servicing
Fair Value Measurements, Range | 1.50% | 1.50%

X
- Definition Reflects the interest rate percentage. + References No definition available. + Details
Name: | sbfg_FairValueInputInterestRate
Namespace Prefix: | sbfg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of the unobservable inputs used in the valuation of investment assets by the entity. + References No definition available. + Details
Name: | sbfg_FairValueMeasurementsUnobservableInputDescription
Namespace Prefix: | sbfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Quantitative information about unobservable inputs used in recurring and nonrecurring fair value measurements. + References No definition available. + Details
Name: | sbfg_QuantitativeInformationAboutUnobservableInputsUsedInRecurringAndNonrecurringFairValueMeasurementsAbstract
Namespace Prefix: | sbfg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementsValuationTechniques
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=sbfg_CollateralDependentImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbfg_UnobservableInputsAxis=sbfg_ComparabilityAdjustmentsPercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=sbfg_MortgageServicingRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbfg_UnobservableInputsAxis=sbfg_DiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbfg_UnobservableInputsAxis=sbfg_ConstantPrepaymentRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbfg_UnobservableInputsAxis=sbfg_PAndIEarningsCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbfg_UnobservableInputsAxis=sbfg_TAndIEarningsCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbfg_UnobservableInputsAxis=sbfg_InflationForCostOfServicingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |