XML 79 R64.htm IDEA: XBRL DOCUMENT
v3.19.1

SECURITIES AVAILABLE FOR SALE - Summary of Amortized Cost and Fair Value and Corresponding Amounts of Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 469,607 | $ 411,706
Gross Unrealized Gains | 2,432 | 7,496
Gross Unrealized Losses | 6,195 | 3,894
Fair Value | 465,844 | 415,308
States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 144,596 | 153,803
Gross Unrealized Gains | 1,919 | 6,133
Gross Unrealized Losses | 1,511 | 478
Fair Value | 145,004 | 159,458
GSE residential MBSs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 48,600
Gross Unrealized Gains |  | 930
Gross Unrealized Losses |  | 0
Fair Value |  | 49,530
GSE residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 110,421 | 113,658
Gross Unrealized Gains | 332 | 296
Gross Unrealized Losses | 2,689 | 2,835
Fair Value | 108,064 | 111,119
Private label residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 144 | 999
Gross Unrealized Gains | 0 | 4
Gross Unrealized Losses | 1 | 0
Fair Value | 143 | 1,003
Private label commercial CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 75,911 | 7,809
Gross Unrealized Gains | 55 | 0
Gross Unrealized Losses | 921 | 156
Fair Value | 75,045 | 7,653
Asset-backed and other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 138,535 | 86,837
Gross Unrealized Gains | 126 | 133
Gross Unrealized Losses | 1,073 | 425
Fair Value | $ 137,588 | $ 86,545

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=82897076&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=82897076&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=82897076&loc=d3e27161-111563 + 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 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: 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=82897076&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_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
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_PrivateResidentialCollateralizedMortgageObligationsMember
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: |