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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES- CASH (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Average balances | $ 9.2 | $ 11.0

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

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- Definition Average balances to be maintained on hand or with correspondent banks. + References No definition available. + Details
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Namespace Prefix: | wk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant