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Regulatory Matters - Summary of Risk-Based Capital Amounts and Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Percentage of risk-weighted assets in bank holding companies in Tier 1 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets  
Tier 1 capital to risk-weighted assets, minimum value 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Total capital to risk-weighted assets, minimum value 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Tier 1 leverage, well capitalized     
Tier 1 capital to risk-weighted assets, well capitalized 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets  
Total capital to risk-weighted assets, well capitalized 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets  
Tier 1 leverage, amount $ 593,031us-gaap_TierOneLeverageCapital $ 544,083us-gaap_TierOneLeverageCapital
Tier 1 capital to risk-weighted assets, amount 593,031us-gaap_TierOneRiskBasedCapital 544,083us-gaap_TierOneRiskBasedCapital
Total capital to risk-weighted assets, amount 638,064us-gaap_Capital 591,451us-gaap_Capital
Tier 1 leverage, ratio 9.88%us-gaap_TierOneLeverageCapitalToAverageAssets 9.27%us-gaap_TierOneLeverageCapitalToAverageAssets
Tier 1 capital to risk-weighted assets, ratio 13.76%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 13.06%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Total capital to risk-weighted assets, ratio 14.81%us-gaap_CapitalToRiskWeightedAssets 14.19%us-gaap_CapitalToRiskWeightedAssets
WesBanco Bank Inc [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Percentage of risk-weighted assets in bank holding companies in Tier 1 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Tier 1 capital to risk-weighted assets, minimum value 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Total capital to risk-weighted assets, minimum value 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Tier 1 leverage, well capitalized 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Tier 1 capital to risk-weighted assets, well capitalized 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Total capital to risk-weighted assets, well capitalized 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Tier 1 leverage, amount 516,689us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
502,165us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
Tier 1 capital to risk-weighted assets, amount 516,689us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
502,165us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
Total capital to risk-weighted assets, amount 561,369us-gaap_Capital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
549,533us-gaap_Capital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
Tier 1 leverage, ratio 8.63%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
8.58%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
Tier 1 capital to risk-weighted assets, ratio 12.04%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
12.11%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
Total capital to risk-weighted assets, ratio 13.08%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
13.25%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
Minimum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Percentage of risk-weighted assets in bank holding companies in Tier 1 3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Tier 1 leverage, amount 240,068us-gaap_TierOneLeverageCapital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
234,863us-gaap_TierOneLeverageCapital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 capital to risk-weighted assets, amount 172,357us-gaap_TierOneRiskBasedCapital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
166,691us-gaap_TierOneRiskBasedCapital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total capital to risk-weighted assets, amount 344,714us-gaap_Capital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
333,382us-gaap_Capital
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 leverage, ratio 3.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Minimum [Member] | WesBanco Bank Inc [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage, amount 239,533us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
234,109us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Tier 1 capital to risk-weighted assets, amount 171,612us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
165,828us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Total capital to risk-weighted assets, amount $ 343,225us-gaap_Capital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
$ 331,656us-gaap_Capital
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember