Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 66,853	$ 56,509
INVESTING ACTIVITIES
Net increase in loans held for investment	(11,819)	(141,174)
Debt securities available-for-sale:
Proceeds from sales	81,521	7,760
Proceeds from maturities, prepayments and calls	114,206	102,225
Purchases of securities	(625,395)	(104,584)
Debt securities held-to-maturity:
Proceeds from maturities, prepayments and calls	37,842	64,188
Purchases of securities	(44,656)	(29,912)
Equity securities:
Proceeds from sales	827
Purchases of securities	(467)
Proceeds from bank-owned life insurance	4,772	349
Purchases of premises and equipment-net	(845)	(4,898)
Net cash received from acquisition	86,149
Sale of portfolio loans - net	12,996
Net cash used in investing activities	(344,869)	(106,046)
FINANCING ACTIVITIES
Increase in deposits	36,045	32,494
Proceeds from Federal Home Loan Bank borrowings	575,000	415,000
Repayment of Federal Home Loan Bank borrowings	(327,142)	(362,331)
Increase (decrease) in other short-term borrowings	67,103	(6,205)
Decrease in federal funds purchased	(3,000)	(25,500)
Repayment of junior subordinated debt	(8,240)
Dividends paid to common shareholders	(24,226)	(21,969)
Issuance of common stock	1,035	990
Treasury shares purchased - net	(572)	(417)
Net cash provided by financing activities	316,003	32,062
Net increase (decrease) in cash and cash equivalents	37,987	(17,475)
Cash and cash equivalents at beginning of the period	117,572	128,170
Cash and cash equivalents at end of the period	155,559	110,695
SUPPLEMENTAL DISCLOSURES
Interest paid on deposits and other borrowings	29,791	19,844
Income taxes paid	10,000	14,700
Transfers of loans to other real estate owned	229	$ 298
Transfers of loans to held for sale	12,996
Non-cash transactions related to FTSB acquisition	$ 107,347

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Equity securities.

+ References

No definition available.

+ Details

Name:	wsbc_EquitySecuritiesAbstract
Namespace Prefix:	wsbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Non cash transaction related to acquisition.

+ References

No definition available.

+ Details

Name:	wsbc_NonCashTransactionRelatedToAcquisition
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Payments to acquire equity securities.

+ References

No definition available.

+ Details

Name:	wsbc_PaymentsToAcquireEquitySecurities
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Proceeds from (repurchase of) treasury stock.

+ References

No definition available.

+ Details

Name:	wsbc_ProceedsFromRepurchaseOfTreasuryStock
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Proceeds from sale of equity securities.

+ References

No definition available.

+ Details

Name:	wsbc_ProceedsFromSaleOfEquitySecurities
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration