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DEPOSITS - Narrative (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Brokered time deposits | $ 0.0 | $ 16.1
Bank Time Deposits |  |
Cash and Cash Equivalents [Line Items] |  |
Time deposits that meet or exceed the FDIC limit | $ 61.9 | $ 69.1

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- 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
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Definition Time deposit brokered. + References No definition available. + Details
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Namespace Prefix: | wk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |