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SHORT-TERM BORROWINGS - Summary of the Use of Securities Sold Under Agreements to Repurchase (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Disclosure [Abstract] |  |  |
Balance at year-end | $ 19,466 | $ 8,269 | $ 9,069
Weighted average interest rate at year-end | 0.23% | 1.31% | 1.22%
Average balance during the year | $ 18,064 | $ 8,830 | $ 9,715
Average interest rate during the year | 0.47% | 1.28% | 0.82%
Maximum month-end balance during the year | $ 24,403 | $ 12,774 | $ 14,591
Fair value of securities underlying the agreements at year-end | $ 29,477 | $ 13,062 | $ 17,942

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- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition Assets sold under agreements to repurchase average interest rate during period. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Assets sold under agreements to repurchase average outstanding amount. + References No definition available. + Details
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Namespace Prefix: | wk_
Data Type: | xbrli:monetaryItemType
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- Definition Assets sold under agreements to repurchase maximum month end outstanding amount. + References No definition available. + Details
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- Definition Assets Sold Under Agreements To Repurchase, Weighted Average Interest + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Securities held under agreements to repurchase fair value. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant