XML 51 R34.htm IDEA: XBRL DOCUMENT
v3.19.3

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items] |  |
Regulatory capital impact period | 3 years |
Capitalized right of use asset and lease liabilities to be regcognize upon adoption of ASU | $ 20.0 |
Municipal Debt Securities [Member] | Accounting Standards Update 2017-12 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Reclassification of callable held-to-maturity securities |  | $ 67.3
Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Estimated percentage increase in allowance for credit losses for loan portfolio | 30.00% |
Tier 1 risk-based capital ratio reduction | 0.15% |

X
- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Capitalized right of use asset and lease liabilities to be regcognize upon adoption of ASU. + References No definition available. + Details
Name: | wsbc_CapitalizedRightOfUseAssetAndLeaseLiabilitiesToBeRegcognizeUponAdoptionOfASU
Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Estimated percentage increase in allowance for credit losses for loan portfolio. + References No definition available. + Details
Name: | wsbc_EstimatedPercentageIncreaseInAllowanceForCreditLossesForLoanPortfolio
Namespace Prefix: | wsbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reclassification of callable held -to- maturity securities. + References No definition available. + Details
Name: | wsbc_ReclassificationOfCallableHeldToMaturitySecurities
Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Regulatory capital impact period. + References No definition available. + Details
Name: | wsbc_RegulatoryCapitalImpactPeriod
Namespace Prefix: | wsbc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Summary of significant accounting policies. + References No definition available. + Details
Name: | wsbc_SummaryOfSignificantAccountingPoliciesLineItems
Namespace Prefix: | wsbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=wsbc_MunicipalDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201712Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |