Regulatory Matters - Summary of Risk-Based Capital Amounts and Ratios (Detail) (USD $) In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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Percentage of risk-weighted assets in bank holding companies in Tier 1 |
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets |
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Tier 1 capital to risk-weighted assets, minimum value |
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets |
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Total capital to risk-weighted assets, minimum value |
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets |
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Tier 1 leverage, well capitalized |
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Tier 1 capital to risk-weighted assets, well capitalized |
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets |
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Total capital to risk-weighted assets, well capitalized |
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets |
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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] |
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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Percentage of risk-weighted assets in bank holding companies in Tier 1 |
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = wsbc_WesBancoBankIncMember |
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Tier 1 capital to risk-weighted assets, minimum value |
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = wsbc_WesBancoBankIncMember |
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Total capital to risk-weighted assets, minimum value |
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = wsbc_WesBancoBankIncMember |
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Tier 1 leverage, well capitalized |
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = wsbc_WesBancoBankIncMember |
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Tier 1 capital to risk-weighted assets, well capitalized |
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = wsbc_WesBancoBankIncMember |
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Total capital to risk-weighted assets, well capitalized |
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = wsbc_WesBancoBankIncMember |
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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] |
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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Percentage of risk-weighted assets in bank holding companies in Tier 1 |
3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / us-gaap_RangeAxis = us-gaap_MinimumMember |
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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 |
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Minimum [Member] | WesBanco Bank Inc [Member] |
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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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 |