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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
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Balance at year-end	$ 9,069	$ 43,576	$ 35,864
Weighted average interest rate at year-end	1.22%	0.56%	0.20%
Average balance during the year	$ 9,715	$ 43,205	$ 38,546
Average interest rate during the year	0.82%	0.45%	0.20%
Maximum month-end balance during the year	$ 14,591	$ 55,270	$ 52,693
Fair value of securities underlying the agreements at year-end	$ 17,942	$ 53,485	$ 56,201

X

- 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=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

Assets sold under agreements to repurchase average interest rate during period.

+ References

No definition available.

+ Details

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Namespace Prefix:	wk_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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
Balance Type:	credit
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X

- Definition

Assets sold under agreements to repurchase maximum month end outstanding amount.

+ References

No definition available.

+ Details

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X

- Definition

Assets Sold Under Agreements To Repurchase, Weighted Average Interest

+ References

No definition available.

+ Details

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Namespace Prefix:	wk_
Data Type:	num:percentItemType
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X

- Definition

Securities held under agreements to repurchase fair value.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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