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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Loans Serviced (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Balance of loans serviced for others | $ 441.1 | $ 360.1

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- 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 Balance of loans serviced for others. + References No definition available. + Details
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Namespace Prefix: | wk_
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Balance Type: | debit
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