XML 134 R119.htm IDEA: XBRL DOCUMENT
v3.19.1

FAIR VALUE - Schedule of Additional Qualitative Information (Detail) - Fair Value, Measurements, Nonrecurring - Impaired loans $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | ---
Appraisal of Collateral |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Fair Value Estimate | $ 3,051 | $ 7,173
Minimum |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) |  | 0
Minimum | Appraisal of Collateral |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) |  | 0.07
Maximum |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) |  | 0.20
Maximum | Appraisal of Collateral |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) |  | 0.75
Measurement Input, Discount Rate | Minimum |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.06 |
Measurement Input, Discount Rate | Minimum | Appraisal of Collateral |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.05 |
Measurement Input, Discount Rate | Maximum |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.20 |
Measurement Input, Discount Rate | Maximum | Appraisal of Collateral |  |
Fair Value Inputs and Valuation Techniques [Line Items] |  |
Asset, measurement input (percent) | 0.75 |

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of input used to measure servicing asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
Name: | us-gaap_ServicingAssetMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=wk_ImpairedLoansNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=wk_AppraisalOfCollateralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |