XML 128 R68.htm IDEA: XBRL DOCUMENT v3.20.4

INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value and Corresponding Amounts of Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 460,999	$ 491,492
Gross Unrealized Gains	12,054	5,582
Gross Unrealized Losses	6,588	6,189
Securities available for sale (amortized cost of $460,999 and $491,492 at December 31, 2020 and 2019, respectively)	466,465	490,885
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	104,704	83,607
Gross Unrealized Gains	9,091	4,288
Gross Unrealized Losses	1,125	32
Securities available for sale (amortized cost of $460,999 and $491,492 at December 31, 2020 and 2019, respectively)	112,670	87,863
GSE residential MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,197
Gross Unrealized Gains	96
Gross Unrealized Losses	0
Securities available for sale (amortized cost of $460,999 and $491,492 at December 31, 2020 and 2019, respectively)	4,293
GSE residential CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	56,856	67,928
Gross Unrealized Gains	2,226	1,000
Gross Unrealized Losses	1,071	774
Securities available for sale (amortized cost of $460,999 and $491,492 at December 31, 2020 and 2019, respectively)	58,011	68,154
Non-agency CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,505	17,210
Gross Unrealized Gains	413	0
Gross Unrealized Losses	0	123
Securities available for sale (amortized cost of $460,999 and $491,492 at December 31, 2020 and 2019, respectively)	16,918	17,087
Private label commercial CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	63,941	86,704
Gross Unrealized Gains	57	156
Gross Unrealized Losses	1,762	231
Securities available for sale (amortized cost of $460,999 and $491,492 at December 31, 2020 and 2019, respectively)	62,236	86,629
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	214,425	235,406
Gross Unrealized Gains	171	138
Gross Unrealized Losses	2,630	5,029
Securities available for sale (amortized cost of $460,999 and $491,492 at December 31, 2020 and 2019, respectively)	211,966	230,515
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	371	637
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Securities available for sale (amortized cost of $460,999 and $491,492 at December 31, 2020 and 2019, respectively)	$ 371	$ 637

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=wk_ResidentialCollateralizedMortgageObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=wk_NonAgencyCollateralizedMortgageObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=wk_PrivateLabelCommercialCollateralizedMortgageObligationsCMOsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=wk_AssetbackedSecuritiesAndOtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_OtherAggregatedInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: