XML 115 R100.htm IDEA: XBRL DOCUMENT
v3.19.1

DEPOSITS - Narrative (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Brokered time deposits | $ 126,556 | $ 96,368
Bank Time Deposits |  |
Cash and Cash Equivalents [Line Items] |  |
Time deposits that meet or exceed the FDIC limit | $ 40,327 | $ 21,888

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_CashAndCashEquivalentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_CashUninsuredAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_BankTimeDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |