WesBanco (WSBC) 10-Q 1 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 22, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	WSBC
Entity Registrant Name	WESBANCO INC
Entity Central Index Key	0000203596
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		54,599,127

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks, including interest bearing amounts of $177,797 and $44,536, respectively	$ 336,894	$ 169,186
Securities:
Equity securities, at fair value	11,978	11,737
Available-for-sale debt securities, at fair value	2,145,089	2,114,129
Held-to-maturity debt securities (fair values of $948,641 and $1,020,743, respectively)	936,484	1,020,934
Total securities	3,093,551	3,146,800
Loans held for sale	8,358	8,994
Portfolio loans, net of unearned income	7,666,081	7,656,281
Allowance for loan losses	(48,866)	(48,948)
Net portfolio loans	7,617,215	7,607,333
Premises and equipment, net	180,651	166,925
Accrued interest receivable	39,662	38,853
Goodwill and other intangible assets, net	915,597	918,850
Bank-owned life insurance	226,636	225,317
Other assets	182,844	176,374
Total Assets	12,601,408	12,458,632
Deposits:
Non-interest bearing demand	2,511,140	2,441,041
Interest bearing demand	2,159,654	2,146,508
Money market	1,148,295	1,142,925
Savings deposits	1,672,967	1,645,549
Certificates of deposit	1,424,275	1,455,610
Total deposits	8,916,331	8,831,633
Federal Home Loan Bank borrowings	1,031,796	1,054,174
Other short-term borrowings	301,547	290,522
Subordinated debt and junior subordinated debt	179,632	189,842
Total borrowings	1,512,975	1,534,538
Accrued interest payable	6,030	4,627
Other liabilities	142,933	109,007
Total Liabilities	10,578,269	10,479,805
SHAREHOLDERS' EQUITY
Preferred stock, no par value; 1,000,000 shares authorized; none outstanding
Common stock, $2.0833 par value; 100,000,000 shares authorized; 54,604,294 shares issued in 2019 and 2018, respectively; 54,599,127 and 54,598,134 shares outstanding in 2019 and 2018, respectively	113,758	113,758
Capital surplus	1,167,761	1,166,701
Retained earnings	761,002	737,581
Treasury stock (5,167 and 6,160 shares in 2019 and 2018, respectively, at cost)	(229)	(274)
Accumulated other comprehensive loss	(18,098)	(37,871)
Deferred benefits for directors	(1,055)	(1,068)
Total Shareholders' Equity	2,023,139	1,978,827
Total Liabilities and Shareholders' Equity	$ 12,601,408	$ 12,458,632

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Interest bearing deposits, banks	$ 177,797	$ 44,536
Held-to-maturity securities, fair values	$ 948,641	$ 1,020,743
Preferred stock, no par value
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 2.0833	$ 2.0833
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	54,604,294	54,604,294
Common stock, shares outstanding	54,599,127	54,598,134
Treasury stock, shares	5,167	6,160

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.31	$ 0.29
COMPREHENSIVE INCOME	$ 60,110	$ 19,011
INTEREST AND DIVIDEND INCOME
Loans, including fees	95,502	69,237
Other interest income	1,277	803
Total interest and dividend income	119,053	86,417
Interest and dividends on securities:
Taxable	16,733	11,543
Tax-exempt	5,541	4,834
Total interest and dividends on securities	22,274	16,377
INTEREST EXPENSE
Interest bearing demand deposits	3,946	2,524
Money market deposits	1,899	878
Savings deposits	522	189
Certificates of deposit	3,903	2,536
Total interest expense on deposits	10,270	6,127
Federal Home Loan Bank borrowings	6,337	4,498
Other short-term borrowings	1,556	558
Subordinated debt and junior subordinated debt	2,529	1,942
Total interest expense	20,692	13,125
NET INTEREST INCOME	98,361	73,292
Provision for credit losses	2,507	2,168
Net interest income after provision for credit losses	95,854	71,124
NON-INTEREST INCOME
Electronic banking fees	5,892	4,829
Net securities brokerage revenue	1,860	1,670
Bank-owned life insurance	1,319	2,756
Mortgage banking income	1,056	1,004
Net securities gains (losses)	657	(39)
Net gain on other real estate owned and other assets	136	262
Other income	3,189	2,173
Total non-interest income	27,773	23,980
NON-INTEREST EXPENSE
Salaries and wages	30,940	25,006
Employee benefits	9,989	6,912
Net occupancy	5,566	4,656
Equipment	4,833	3,949
Marketing	1,243	1,116
FDIC insurance	1,353	658
Amortization of intangible assets	2,514	1,086
Restructuring and merger-related expense	3,107	245
Other operating expenses	14,887	10,943
Total non-interest expense	74,432	54,571
Income before provision for income taxes	49,195	40,533
Provision for income taxes	8,858	7,004
NET INCOME	$ 40,337	$ 33,529
EARNINGS PER COMMON SHARE
Basic	$ 0.74	$ 0.76
Diluted	$ 0.74	$ 0.76
AVERAGE COMMON SHARES OUTSTANDING
Basic	54,598,499	44,050,701
Diluted	54,706,337	44,168,242
Total Trust Fees [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 7,115	$ 6,503
Service Charges on Deposits [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 6,549	$ 4,822

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Deferred Benefits for Directors [Member]
Beginning Balance at Dec. 31, 2017	$ 1,395,321	$ 91,756	$ 684,730	$ 651,357		$ (31,495)	$ (1,027)
Beginning Balance, shares at Dec. 31, 2017		44,043,244
Net income	33,529			33,529
Other Comprehensive Income (Loss)	(14,518)					(14,518)
Comprehensive income	19,011
Common dividends declared ($0.31 and $0.29 per share)	(12,775)			(12,775)
Adoption of accounting standard ASU 2016-01				1,063		(1,063)
Stock options exercised	560	$ 37	523
Stock options exercised, shares		17,713
Stock compensation expense	909		909
Deferred benefits for directors - net			7				(7)
Ending Balance at Mar. 31, 2018	1,403,026	$ 91,793	686,169	673,174		(47,076)	(1,034)
Ending Balance, shares at Mar. 31, 2018		44,060,957
Beginning Balance at Dec. 31, 2018	1,978,827	$ 113,758	1,166,701	737,581	$ (274)	(37,871)	(1,068)
Beginning Balance, shares at Dec. 31, 2018		54,598,134
Net income	40,337			40,337
Other Comprehensive Income (Loss)	19,773					19,773
Comprehensive income	60,110
Common dividends declared ($0.31 and $0.29 per share)	(16,916)			(16,916)
Treasury shares acquired, shares		(7)
Stock options exercised	20		(25)		45
Stock options exercised, shares		1,000
Stock compensation expense	1,075		1,075
Deferred benefits for directors - net	23		10				13
Ending Balance at Mar. 31, 2019	$ 2,023,139	$ 113,758	$ 1,167,761	$ 761,002	$ (229)	$ (18,098)	$ (1,055)
Ending Balance, shares at Mar. 31, 2019		54,599,127

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Common dividends declared, per share	$ 0.31	$ 0.29

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING ACTIVITIES
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 51,190	$ 31,907
INVESTING ACTIVITIES
Net (increase) decrease in loans held for investment	(5,287)	19,923
Available-for-sale debt securities:
Proceeds from sales	66,095	0
Proceeds from maturities, prepayments and calls	79,051	53,496
Purchases of securities	(85,096)	(540,624)
Held-to-maturity debt securities:
Proceeds from maturities, prepayments and calls	20,067	17,121
Purchases of securities	(4,308)	(15,343)
Equity securities:
Proceeds from sales	590
Proceeds from bank-owned life insurance		3,506
Purchases of premises and equipment-net	(2,181)	(328)
Net cash provided by (used in) investing activities	68,931	(462,249)
FINANCING ACTIVITIES
Increase in deposits	85,238	183,012
Proceeds from Federal Home Loan Bank borrowings	100,000	375,000
Repayment of Federal Home Loan Bank borrowings	(122,463)	(156,261)
Increase in other short-term borrowings	11,025	27,848
Principal repayments of finance lease obligations	(99)	(94)
Decrease in federal funds purchased		(5,000)
Repayment of junior subordinated debt	(10,310)
Dividends paid to common shareholders	(15,824)	(11,450)
Issuance of common stock		560
Treasury shares sold—net	20
Net cash provided by financing activities	47,587	413,615
Net increase (decrease) in cash and cash equivalents	167,708	(16,727)
Cash and cash equivalents at beginning of the period	169,186	117,572
Cash and cash equivalents at end of the period	336,894	100,845
SUPPLEMENTAL DISCLOSURES
Interest paid on deposits and other borrowings	19,645	$ 12,496
Income taxes paid
Transfers of loans to other real estate owned	402
Transfer of held-to-maturity debt securities to available-for-sale debt securities	$ 67,393

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of presentation — The accompanying unaudited interim financial statements of WesBanco, Inc. and its consolidated subsidiaries (“WesBanco”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2018. WesBanco’s interim financial statements have been prepared following the significant accounting policies disclosed in Note 1 of the Notes to the Consolidated Financial Statements of its 2018 Annual Report on Form 10-K filed with the Securities and Exchange Commission. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly WesBanco’s financial position and results of operations for each of the interim periods presented. Certain prior period amounts have been reclassified to conform to the current period presentation. Such reclassifications had no impact on WesBanco’s net income and stockholders’ equity. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year. Recent accounting pronouncements — In August 2018, the FASB issued ASU 2018-14, “Compensation—Retirement Benefits—Defined Benefit Plans—General (Topic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans.” This ASU modifies ASC 715-20 to improve disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The guidance is effective for fiscal years ending after December 15, 2020. Early adoption is permitted. WesBanco is currently assessing the impact of ASU 2018-14 on WesBanco’s Consolidated Financial Statements. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement – Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU modifies the disclosure objective paragraphs of ASC 820 to eliminate (1) “at a minimum” from the phrase “an entity shall disclose at a minimum” and (2) other similar “open ended” disclosure requirements to promote the appropriate exercise of discretion of entities. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted, including adoption in an interim period. WesBanco is currently assessing the impact of ASU 2018-13 on WesBanco’s Consolidated Financial Statements. In September 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326)”, which will require entities to use a new forward-looking “expected loss” model on trade and other receivables, held-to-maturity debt securities, loans and other instruments that generally will result in the earlier recognition of allowances for credit losses. For available-for-sale debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. Entities will have to disclose significantly more information, including information they use to track credit quality by year of origination for most financing receivables. Public business entities must apply the new requirements for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which for WesBanco will be effective for the fiscal year beginning January 1, 2020. Early adoption is permitted for fiscal years beginning after December 15, 2018. WesBanco formed a cross-functional team to oversee the implementation of this ASU, and has completed an initial data gap assessment, finalized the loan segmentation procedures, and is currently evaluating the various forecasting and modeling assumptions, including qualitative factors, that will be used to estimate the initial current expected credit loss allowance. Substantial progress has been made on the identification and staging of data, development of models, refinement of economic forecasting processes, and documentation of accounting policy decisions. In conjunction with this implementation, WesBanco is reviewing business processes and evaluating potential changes to the control environment. Acquired loans or pools of loans that have experienced more-than-insignificant credit deterioration are deemed to be purchased credit deteriorated (“PCD”) loans, and are grossed-up on day 1 by the initial credit estimate through goodwill as opposed to the provision for credit losses. At acquisition, WesBanco will consider several factors as indicators that an acquired loan or pool of loans has experienced more-than-insignificant credit deterioration. These factors may include loan 30 days or more past due, loans with an internal risk grade of below average or lower, loans classified as non-accrual by the acquired institution, materiality of the credit and loans that have been previously modified in a troubled debt restructuring. WesBanco plans to perform several parallel runs of the new methodology in 2019 prior to adoption of the ASU. WesBanco currently anticipates that an increase to the allowance for credit losses will be recognized upon adoption to provide for the expected credit losses over the estimated life of the financial assets. The magnitude of the increase will depend on economic conditions and trends in the loan portfolio at the time of adoption. In February 2016, the FASB issued ASU 2016-02, entities to recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. The principal difference from previous guidance is that the lease assets and lease liabilities arising from operating leases were not previously recognized in the balance sheet. Public business entities must apply the new requirements for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. For WesBanco, this update was effective for the fiscal year beginning January 1, 2019. In January 2018, the FASB issued ASU 2018-01, which allows entities the option to apply the provisions of the new lease guidance at the effective date without adjusting the comparative periods presented. In July 2018, the FASB issued ASU 2018-10, which provides narrow-scope improvements to the lease standard and ASU 2018-11, which allows entities to choose an additional transition method, under which an entity initially applies the new lease standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Under this transitional method, the entity shall recognize and measure the leases that exist at the adoption date and the prior comparative periods are not adjusted. In August 2017, the FASB issued ASU 2017-12, “Targeted Improvements to Accounting for Hedging Activities.” The new guidance will make more financial and nonfinancial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. It is intended to more closely align hedge accounting with companies’ risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. For WesBanco, this update was effective for the fiscal year beginning January 1, 2019. Upon adoption, WesBanco reclassified $67.3 million of callable held-to-maturity municipal debt securities to available-for-sale debt securities. In October 2018, the FASB issued ASU 2018-16, “Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes.” This ASU modifies ASC 815 for eligible benchmark interest rates. Due to concerns about the sustainability of the London Interbank Offered Rate (LIBOR), the Federal Reserve initiated an effort to introduce an alternative reference rate in the United States. The Overnight Index Swap (OIS) rate, which is based on SOFR is permitted as a U.S. benchmark interest rate for hedge accounting purposes. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. For WesBanco, this update was effective for the fiscal year beginning January 1, 2019. The adoption of this pronouncement did not have a material impact on WesBanco’s Consolidated Financial Statements.

Mergers and Acquisitions

Mergers and Acquisitions	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Mergers and Acquisitions	NOTE 2. MERGERS AND ACQUISITIONS On August 20, 2018, WesBanco completed its acquisition of Farmers Capital Bank Corp. (“FFKT”), a bank holding company headquartered in Frankfort, KY . On the acquisition date, FFKT had approximately $1.6 billion in assets, excluding goodwill, which included approximately $1.0 billion in loans and $239.3 million in securities. The FFKT acquisition was valued at $428.9 million, based on WesBanco’s closing stock price on August 20, 2018, of $49.40, and resulted in WesBanco issuing 7,920,387 For the three months ended March 31, 2019, WesBanco recorded merger-related expenses of $3.1 million associated with the FFKT acquisition. The preliminary purchase price of the FFKT acquisition and resulting goodwill is summarized as follows: (unaudited, in thousands) August 20, 2018 Purchase price: Fair value of WesBanco shares issued $ 391,267 Cash consideration for outstanding FFKT shares 37,634 Total purchase price $ 428,901 Fair value of: Tangible assets acquired $ 1,369,186 Core deposit and other intangible assets acquired 39,992 Liabilities assumed (1,429,834 ) Net cash received in the acquisition 230,139 Fair value of net assets acquired 209,483 Goodwill recognized $ 219,418 The following table presents the preliminary allocation of the purchase price of the assets acquired and the liabilities assumed at the date of acquisition, as WesBanco intends to finalize its accounting for the acquisition of FFKT within one year from the date of acquisition: (unaudited, in thousands) August 20, 2018 Assets acquired Cash and due from banks $ 230,139 Securities 239,321 Loans 1,025,800 Goodwill and other intangible assets 259,410 Accrued income and other assets 104,065 Total assets acquired $ 1,858,735 Liabilities assumed Deposits $ 1,330,328 Borrowings 71,780 Accrued expenses and other liabilities 27,726 Total liabilities assumed $ 1,429,834 Net assets acquired $ 428,901 The following table presents the changes in the allocation of the purchase price of the assets acquired and the liabilities assumed at the date of the acquisition previously reported as of December 31, 2018: (unaudited, in thousands) August 20, 2018 Goodwill recognized as of December 31, 2018 $ 220,240 Change in fair value of net assets acquired: Assets Loans 24 Premises and equipment 188 Other real estate owned (749 ) Accrued income and other assets 1,409 Liabilities Accrued expenses and other liabilities (50 ) Fair value of net assets acquired $ 822 Decrease in goodwill recognized (822 ) Goodwill recognized as of March 31, 2019 $ 219,418 The fair value estimates for loans, premises and equipment, deferred taxes and other assets/liabilities have continued to fluctuate as the final valuations and/or appraisals are completed. The Company expects to finalize the purchase price accounts of FFKT within one year of the date of acquisition.

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Common Share	NOTE 3. EARNINGS PER COMMON SHARE Earnings per common share are calculated as follows: For the Three Months Ended March 31, (unaudited, in thousands, except shares and per share amounts) 2019 2018 Numerator for both basic and diluted earnings per common share: Net income $ 40,337 $ 33,529 Denominator: Total average basic common shares outstanding 54,598,499 44,050,701 Effect of dilutive stock options and other stock compensation 107,838 117,541 Total diluted average common shares outstanding 54,706,337 44,168,242 Earnings per common share—basic $ 0.74 $ 0.76 Earnings per common share—diluted $ 0.74 $ 0.76 As of March 31, 2019, 117,600 options to purchase shares were excluded in the diluted shares computation because the exercise price was greater than the average market price of the common shares and, therefore, the effect would be antidilutive. All options to purchase shares were included in the diluted shares computation as of March 31, 2018. As of March 31, 2019, contingently issuable shares, totaling 44,688 17,081 39,216 9,000

Securities

Securities	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Securities	NOTE 4. SECURITIES The following table presents the fair value and amortized cost of available-for-sale and held-to-maturity debt securities: March 31, 2019 December 31, 2018 Gross Gross Estimated Gross Gross Estimated Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair (unaudited, in thousands) Cost Gains Losses Value Cost Gains Losses Value Available-for-sale debt securities U.S. Treasury $ 19,699 $ 13 $ — $ 19,712 $ 19,882 $ 3 $ (7 ) $ 19,878 U.S. Government sponsored entities and agencies 138,380 1,535 (625 ) 139,290 142,852 556 (1,756 ) 141,652 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 1,590,044 8,646 (15,906 ) 1,582,784 1,585,864 2,912 (27,521 ) 1,561,255 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 177,168 1,179 (1,342 ) 177,005 171,671 264 (2,963 ) 168,972 Obligations of states and political subdivisions 182,603 3,613 (149 ) 186,067 184,057 2,039 (982 ) 185,114 Corporate debt securities 40,114 279 (162 ) 40,231 37,730 87 (559 ) 37,258 Total available-for-sale debt securities $ 2,148,008 $ 15,265 $ (18,184 ) $ 2,145,089 $ 2,142,056 $ 5,861 $ (33,788 ) $ 2,114,129 Held-to-maturity debt securities U.S. Government sponsored entities and agencies $ 10,627 $ 7 $ (357 ) $ 10,277 $ 10,823 $ 6 $ (329 ) $ 10,500 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 142,931 359 (2,258 ) 141,032 148,300 204 (4,170 ) 144,334 Obligations of states and political subdivisions 749,652 14,435 (637 ) 763,450 828,520 8,771 (4,012 ) 833,279 Corporate debt securities 33,274 644 (36 ) 33,882 33,291 12 (673 ) 32,630 Total held-to-maturity debt securities $ 936,484 $ 15,445 $ (3,288 ) $ 948,641 $ 1,020,934 $ 8,993 $ (9,184 ) $ 1,020,743 Total debt securities $ 3,084,492 $ 30,710 $ (21,472 ) $ 3,093,730 $ 3,162,990 $ 14,854 $ (42,972 ) $ 3,134,872 At March 31, 2019 and December 31, 2018, there were no holdings of any one issuer, other than U.S. government sponsored entities and its agencies, in an amount greater than 10 Equity securities, of which $ 8.5 12.0 The following table presents the fair value of available-for-sale and held-to-maturity debt securities by contractual maturity at March 31, 2019. In some instances, the issuers may have the right to call or prepay obligations without penalty prior to the contractual maturity date. March 31, 2019 (unaudited, in thousands) One Year or less One to Five Years Five to Ten Years After Ten Years Mortgage-backed securities Total Available-for-sale debt securities U.S. Treasury $ 19,712 $ — $ — $ — $ — $ 19,712 U.S. Government sponsored entities and agencies 496 5,948 18,353 16,042 98,451 139,290 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1) — — — — 1,582,784 1,582,784 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1) — — — — 177,005 177,005 Obligations of states and political subdivisions 11,253 47,331 83,027 44,456 — 186,067 Corporate debt securities 1,027 32,139 7,065 — — 40,231 Total available-for-sale debt securities $ 32,488 $ 85,418 $ 108,445 $ 60,498 $ 1,858,240 $ 2,145,089 Held-to-maturity debt securities (2) U.S. Government sponsored entities and agencies $ — $ — $ — $ — $ 10,277 $ 10,277 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1) — — — 141,032 141,032 Obligations of states and political subdivisions 9,048 117,502 352,924 283,976 — 763,450 Corporate debt securities — 8,680 25,202 — — 33,882 Total held-to-maturity debt securities $ 9,048 $ 126,182 $ 378,126 $ 283,976 $ 151,309 $ 948,641 Total debt securities $ 41,536 $ 211,600 $ 486,571 $ 344,474 $ 2,009,549 $ 3,093,730 (1) Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. (2) The held-to-maturity debt securities portfolio is carried at an amortized cost of $ 936.5 Securities with aggregate fair values of $2.0 billion at March 31, 2019 and December 31, 2018 were pledged as security for public and trust funds, and securities sold under agreements to repurchase. Proceeds from the sale of available-for-sale securities were $66.1 million and $0 million for the three months ended March 31, 2019 and 2018, respectively. Net unrealized losses on available-for-sale securities included in accumulated other comprehensive income net of tax, as of March 31, 2019 and December 31, 2018 were $ 2.3 The following table presents the gross realized gains and losses on sales and calls of available-for-sale and held-to-maturity debt securities, as well as gains and losses on equity securities from both sales and market adjustments from the adoption of ASU 2016-01 effective January 1, 2018 for the three months ended March 31, 2019 and 2018, respectively. For the Three Months Ended March 31, (unaudited, in thousands) 2019 2018 Debt securities: Gross realized gains $ 242 $ 7 Gross realized losses (191 ) (18 ) Net gains (losses) on debt securities $ 51 $ (11 ) Equity securities: Net unrealized gains (losses) recognized on securities still held $ 603 $ (28 ) Net realized gains recognized on securities sold 3 — Net gains (losses) on equity securities $ 606 $ (28 ) Net securities gains (losses) $ 657 $ (39 ) The following tables provide information on unrealized losses on debt securities that have been in an unrealized loss position for less than twelve months and twelve months or more as of March 31, 2019 and December 31, 2018: March 31, 2019 Less than 12 months 12 months or more Total (unaudited, dollars in thousands) Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities U.S. Government sponsored entities and agencies $ 758 $ (4 ) 2 $ 62,057 $ (978 ) 14 $ 62,815 $ (982 ) 16 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 37,601 (198 ) 8 896,540 (17,966 ) 286 934,141 (18,164 ) 294 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 8,208 (25 ) 4 99,578 (1,317 ) 12 107,786 (1,342 ) 16 Obligations of states and political subdivisions 2,514 (7 ) 7 130,249 (779 ) 224 132,763 (786 ) 231 Corporate debt securities 8,369 (118 ) 4 9,886 (80 ) 5 18,255 (198 ) 9 Total temporarily impaired securities $ 57,450 $ (352 ) 25 $ 1,198,310 $ (21,120 ) 541 $ 1,255,760 $ (21,472 ) 566 December 31, 2018 Less than 12 months 12 months or more Total (unaudited, dollars in thousands) Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities U.S. Treasury $ 9,972 $ (7 ) 1 $ — $ — — $ 9,972 $ (7 ) 1 U.S. Government sponsored entities and agencies 18,926 (148 ) 8 76,385 (1,937 ) 14 95,311 (2,085 ) 22 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 285,534 (1,862 ) 44 922,698 (29,829 ) 291 1,208,232 (31,691 ) 335 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 9,186 (18 ) 6 111,068 (2,945 ) 14 120,254 (2,963 ) 20 Obligations of states and political subdivisions 104,469 (439 ) 207 303,681 (4,555 ) 513 408,150 (4,994 ) 720 Corporate debt securities 38,791 (898 ) 18 11,452 (334 ) 5 50,243 (1,232 ) 23 Total temporarily impaired securities $ 466,878 $ (3,372 ) 284 $ 1,425,284 $ (39,600 ) 837 $ 1,892,162 $ (42,972 ) 1,121 Unrealized losses on debt securities in the tables represent temporary fluctuations resulting from changes in market rates in relation to fixed yields. Unrealized losses in the available-for-sale portfolio are accounted for as an adjustment, net of taxes, to other comprehensive income in shareholders’ equity. WesBanco does not believe the securities presented above are impaired due to reasons of credit quality, as substantially all debt securities are rated above investment grade and all are paying principal and interest according to their contractual terms. WesBanco does not intend to sell, nor is it more likely than not that it will be required to sell, loss position securities prior to recovery of their cost, and therefore, management believes the unrealized losses detailed above are temporary and no impairment loss relating to these securities has been recognized. Securities that do not have readily determinable fair values and for which WesBanco does not exercise significant influence are carried at cost. Cost method investments consist primarily of FHLB of Pittsburgh, Cincinnati and Indianapolis stock totaling $ 50.4

Loans and the Allowance for Cre

Loans and the Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Loans and the Allowance for Credit Losses	NOTE 5. LOANS AND THE ALLOWANCE FOR CREDIT LOSSES The recorded investment in loans is presented in the Consolidated Balance Sheets net of deferred loan fees and costs, and discounts on purchased loans. Net deferred loan costs were $ 4.2 3.2 44.8 21.0 49.3 (unaudited, in thousands) March 31, 2019 December 31, 2018 Commercial real estate: Land and construction $ 505,127 $ 528,072 Improved property 3,337,281 3,325,623 Total commercial real estate 3,842,408 3,853,695 Commercial and industrial 1,274,992 1,265,460 Residential real estate 1,628,067 1,611,607 Home equity 590,462 599,331 Consumer 330,152 326,188 Total portfolio loans 7,666,081 7,656,281 Loans held for sale 8,358 8,994 Total loans $ 7,674,439 $ 7,665,275 The following tables summarize changes in the allowance for credit losses applicable to each category of the loan portfolio: Allowance for Credit Losses By Category For the Three Months Ended March 31, 2019 and 2018 (unaudited, in thousands) Commercial Real Estate - Land and Construction Commercial Real Estate - Improved Property Commercial & Industrial Residential Real Estate Home Equity Consumer Deposit Overdraft Total Balance at December 31, 2018: Allowance for loan losses $ 4,039 $ 20,848 $ 12,114 $ 3,822 $ 4,356 $ 2,797 $ 972 $ 48,948 Allowance for loan commitments 169 33 262 12 226 39 — 741 Total beginning allowance for credit losses 4,208 20,881 12,376 3,834 4,582 2,836 972 49,689 Provision for credit losses: Provision for loan losses (6 ) (909 ) 1,050 122 223 233 575 1,288 Provision for loan commitments 25 (9 ) 1,181 (1 ) 22 1 — 1,219 Total provision for credit losses 19 (918 ) 2,231 121 245 234 575 2,507 Charge-offs — (222 ) (635 ) (320 ) (357 ) (661 ) (441 ) (2,636 ) Recoveries 12 198 378 121 47 411 99 1,266 Net charge-offs 12 (24 ) (257 ) (199 ) (310 ) (250 ) (342 ) (1,370 ) Balance at March 31, 2019: Allowance for loan losses 4,045 19,915 12,907 3,745 4,269 2,780 1,205 48,866 Allowance for loan commitments 194 24 1,443 11 248 40 — 1,960 Total ending allowance for credit losses $ 4,239 $ 19,939 $ 14,350 $ 3,756 $ 4,517 $ 2,820 $ 1,205 $ 50,826 Balance at December 31, 2017: Allowance for loan losses $ 3,117 $ 21,166 $ 9,414 $ 3,206 $ 4,497 $ 3,063 $ 821 $ 45,284 Allowance for loan commitments 119 26 173 7 212 37 — 574 Total beginning allowance for credit losses 3,236 21,192 9,587 3,213 4,709 3,100 821 45,858 Provision for credit losses: Provision for loan losses 1,090 (895 ) 919 202 262 583 (48 ) 2,113 Provision for loan commitments 57 (5 ) 3 — (4 ) 4 — 55 Total provision for credit losses 1,147 (900 ) 922 202 258 587 (48 ) 2,168 Charge-offs — (279 ) (109 ) (287 ) (576 ) (1,125 ) (267 ) (2,643 ) Recoveries 117 287 270 131 120 546 109 1,580 Net charge-offs 117 8 161 (156 ) (456 ) (579 ) (158 ) (1,063 ) Balance at March 31, 2018: Allowance for loan losses 4,324 20,279 10,494 3,252 4,303 3,067 615 46,334 Allowance for loan commitments 176 21 176 7 208 41 — 629 Total ending allowance for credit losses $ 4,500 $ 20,300 $ 10,670 $ 3,259 $ 4,511 $ 3,108 $ 615 $ 46,963 The following tables present the allowance for credit losses and recorded investments in loans by category: Allowance for Credit Losses and Recorded Investment in Loans (unaudited, in thousands) Commercial Real Estate- Land and Construction Commercial Real Estate- Improved Property Commercial and Industrial Residential Real Estate Home Equity Consumer Deposit Over- draft Total March 31, 2019 Allowance for credit losses: Allowance for loans individually evaluated for impairment $ — $ 59 $ 12 $ 13 $ 7 $ 1 $ — $ 92 Allowance for loans collectively evaluated for impairment 4,045 19,856 12,895 3,732 4,262 2,779 1,205 48,774 Allowance for loan commitments 194 24 1,443 11 248 40 — 1,960 Total allowance for credit losses $ 4,239 $ 19,939 $ 14,350 $ 3,756 $ 4,517 $ 2,820 $ 1,205 $ 50,826 Portfolio loans: Individually evaluated for impairment (1) $ — $ 2,133 $ 307 $ 5,078 $ 796 $ 103 $ — $ 8,417 Collectively evaluated for impairment 504,885 3,327,142 1,273,810 1,621,169 589,666 330,049 — 7,646,721 Acquired with deteriorated credit quality 242 8,006 875 1,820 — — — 10,943 Total portfolio loans $ 505,127 $ 3,337,281 $ 1,274,992 $ 1,628,067 $ 590,462 $ 330,152 $ — $ 7,666,081 December 31, 2018 Allowance for credit losses: Allowance for loans individually evaluated for impairment $ — $ — $ — $ — $ — $ — $ — $ — Allowance for loans collectively evaluated for impairment 4,039 20,848 12,114 3,822 4,356 2,797 972 48,948 Allowance for loan commitments 169 33 262 12 226 39 — 741 Total allowance for credit losses $ 4,208 $ 20,881 $ 12,376 $ 3,834 $ 4,582 $ 2,836 $ 972 $ 49,689 Portfolio loans: Individually evaluated for impairment (1) $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated for impairment 527,737 3,319,672 1,264,560 1,609,177 599,331 326,063 — 7,646,540 Acquired with deteriorated credit quality 335 5,951 900 2,430 — 125 — 9,741 Total portfolio loans $ 528,072 $ 3,325,623 $ 1,265,460 $ 1,611,607 $ 599,331 $ 326,188 $ — $ 7,656,281 (1) Commercial loans greater than $ 1 WesBanco maintains an internal loan grading system to reflect the credit quality of commercial loans. Commercial loan risk grades are determined based on an evaluation of the relevant characteristics of each loan, assigned at the inception of each loan and adjusted thereafter at any time to reflect changes in the risk profile throughout the life of each loan. The primary factors used to determine the risk grade are the reliability and sustainability of the primary source of repayment and overall financial strength of the borrower. This includes an analysis of cash flow available to repay debt, profitability, liquidity, leverage, and overall financial trends. Other factors include management, industry or property type risks, an assessment of secondary sources of repayment such as collateral or guarantees, other terms and conditions of the loan that may increase or reduce its risk, and economic conditions and other external factors that may influence repayment capacity and financial condition. Commercial real estate – land and construction consists of loans to finance investments in vacant land, land development, construction of residential housing, and construction of commercial buildings. Commercial real estate – improved property consists of loans for the purchase or refinance of all types of improved owner-occupied and investment properties. Factors that are considered in assigning the risk grade vary depending on the type of property financed. The risk grade assigned to construction and development loans is based on the overall viability of the project, the experience and financial capacity of the developer or builder to successfully complete the project, project specific and market absorption rates and comparable property values, and the amount of pre-sales for residential housing construction or pre-leases for commercial investment property. The risk grade assigned to commercial investment property loans is based primarily on the adequacy of net rental income generated by the property to service the debt, the type, quality, industry and mix of tenants, and the terms of leases, but also considers the overall financial capacity of the investors and their experience in owning and managing investment property. The risk grade assigned to owner-occupied commercial real estate and commercial and industrial loans is based primarily on historical and projected earnings, the adequacy of operating cash flow to service all of the business’ debt, and the capital resources, liquidity and leverage of the business, but also considers the industry in which the business operates, the business’ specific competitive advantages or disadvantages, the quality and experience of management, and external influences on the business such as economic conditions. The type, age, condition, location and any environmental risks associated with a property are also considered for all types of commercial real estate. Commercial and industrial (“C&I”) loans consist of revolving lines of credit to finance accounts receivable, inventory and other general business purposes; term loans to finance fixed assets other than real estate, and letters of credit to support trade, insurance or governmental requirements for a variety of businesses. Most C&I borrowers are privately-held companies with annual sales up to $ 100 Pass loans are those that exhibit a history of positive financial results that are at least comparable to the average for their industry or type of real estate. The primary source of repayment is acceptable and these loans are expected to perform satisfactorily during most economic cycles. Pass loans typically have no significant external factors that are expected to adversely affect these borrowers more than others in the same industry or property type. Any minor unfavorable characteristics of these loans are outweighed or mitigated by other positive factors including but not limited to adequate secondary or tertiary sources of repayment. Criticized or compromised loans are currently protected but have weaknesses, which, if not corrected, may be inadequately protected at some future date. These loans represent an unwarranted credit risk and would generally not be extended in the normal course of lending. Specific issues, which may warrant this grade, include declining financial results, increased reliance on secondary sources of repayment or guarantor support and adverse external influences that may negatively impact the business or property. Substandard and doubtful loans are equivalent to the classifications used by banking regulators. Substandard loans are inadequately protected by the current repayment capacity and equity of the borrower or collateral pledged, if any. Substandard loans have one or more well-defined weaknesses that jeopardize their repayment or collection in full. These loans may or may not be reported as non-accrual. Doubtful loans have all the weaknesses inherent to a substandard loan with the added characteristic that full repayment is highly questionable or improbable on the basis of currently existing facts, conditions and collateral values, and are considered non-accrual. However, recognition of loss may be deferred if there are reasonably specific pending factors that will reduce the risk if they occur. The following tables summarize commercial loans by their assigned risk grade: Commercial Loans by Internally Assigned Risk Grade (unaudited, in thousands) Commercial Real Estate- Land and Construction Commercial Real Estate- Improved Property Commercial & Industrial Total Commercial Loans As of March 31, 2019 Pass $ 497,566 $ 3,269,034 $ 1,241,697 $ 5,008,297 Criticized - compromised 5,599 47,464 16,628 69,691 Classified - substandard 1,962 20,783 16,667 39,412 Classified - doubtful — — — — Total $ 505,127 $ 3,337,281 $ 1,274,992 $ 5,117,400 As of December 31, 2018 Pass $ 523,707 $ 3,267,304 $ 1,245,190 $ 5,036,201 Criticized - compromised 2,297 35,566 13,847 51,710 Classified - substandard 2,068 22,753 6,423 31,244 Classified - doubtful — — — — Total $ 528,072 $ 3,325,623 $ 1,265,460 $ 5,119,155 Residential real estate, home equity and consumer loans are not assigned internal risk grades other than as required by regulatory guidelines that are based primarily on the age of past due loans. WesBanco primarily evaluates the credit quality of residential real estate, home equity and consumer loans based on repayment performance and historical loss rates. The aggregate amount of residential real estate, home equity and consumer loans classified as substandard in accordance with regulatory guidelines was $20.1 million at March 31, 2019 and $22.9 million at December 31, 2018, of which $2.0 and $3.9 million were accruing, for each period, respectively. The aggregate amount of residential real estate, home equity and consumer loans classified as substandard are not included in the tables above. Acquired FFKT Loans At March , , no allowance for loan losses has been recognized related to the -acquired impaired loans. Certain acquired underperforming loans with an acquired book value of $ million were sold during the fourth quarter of for $ million. The acquisition date fair value of the acquired loans was adjusted to the sale price resulting in no recognized gain or loss. The following table provides changes in accretable yield for loans acquired with deteriorated credit quality: For the Three Months Ended March 31, March 31, (unaudited, in thousands) 2019 2018 Balance at beginning of period $ 6,203 $ 1,724 Acquisitions 1,300 — Reduction due to change in projected cash flows (74 ) (86 ) Reclass from non-accretable difference 831 2,841 Transfers out — — Accretion (968 ) (268 ) Balance at end of period $ 7,292 $ 4,211 The following tables summarize the age analysis of all categories of loans: Age Analysis of Loans (unaudited, in thousands) Current 30-59 Days 60-89 Days 90 Days Total Total Loans 90 Days As of March 31, 2019 Commercial real estate: Land and construction $ 503,148 $ 1,852 $ 127 $ — $ 1,979 $ 505,127 $ — Improved property 3,325,120 5,226 864 6,071 12,161 3,337,281 558 Total commercial real estate 3,828,268 7,078 991 6,071 14,140 3,842,408 558 Commercial and industrial 1,270,957 905 115 3,015 4,035 1,274,992 221 Residential real estate 1,610,652 6,993 2,656 7,766 17,415 1,628,067 1,096 Home equity 583,118 2,970 398 3,976 7,344 590,462 730 Consumer 327,589 1,579 783 201 2,563 330,152 135 Total portfolio loans 7,620,584 19,525 4,943 21,029 45,497 7,666,081 2,740 Loans held for sale 8,358 — — — — 8,358 — Total loans $ 7,628,942 $ 19,525 $ 4,943 $ 21,029 $ 45,497 $ 7,674,439 $ 2,740 Impaired loans included above are as follows: Non-accrual loans $ 9,203 $ 1,234 $ 1,501 $ 18,289 21,024 $ 30,227 TDRs accruing interest (1) 5,181 196 104 — 300 5,481 Total impaired $ 14,384 $ 1,430 $ 1,605 $ 18,289 $ 21,324 $ 35,708 As of December 31, 2018 Commercial real estate: Land and construction $ 526,660 $ 62 $ 1,350 $ — $ 1,412 $ 528,072 $ — Improved property 3,314,765 2,266 2,250 6,342 10,858 3,325,623 175 Total commercial real estate 3,841,425 2,328 3,600 6,342 12,270 3,853,695 175 Commercial and industrial 1,261,536 323 594 3,007 3,924 1,265,460 13 Residential real estate 1,593,519 2,717 5,001 10,370 18,088 1,611,607 2,820 Home equity 591,623 2,500 1,273 3,935 7,708 599,331 705 Consumer 322,584 2,084 1,007 513 3,604 326,188 364 Total portfolio loans 7,610,687 9,952 11,475 24,167 45,594 7,656,281 4,077 Loans held for sale 8,994 — — — — 8,994 — Total loans $ 7,619,681 $ 9,952 $ 11,475 $ 24,167 $ 45,594 $ 7,665,275 $ 4,077 Impaired loans included above are as follows: Non-accrual loans $ 8,910 $ 337 $ 1,370 $ 20,083 21,790 $ 30,700 TDRs accruing interest (1) 5,586 59 92 7 158 5,744 Total impaired $ 14,496 $ 396 $ 1,462 $ 20,090 $ 21,948 $ 36,444 (1) Loans 90 days or more past due and accruing interest exclude TDRs 90 The following tables summarize impaired loans: Impaired Loans March 31, 2019 December 31, 2018 (unaudited, in thousands) Unpaid Principal Balance (1) Recorded Investment Related Allowance Unpaid Principal Balance (1) Recorded Investment Related Allowance With no related specific allowance recorded: Commercial real estate: Land and construction $ 337 $ 285 $ — $ — $ — $ — Improved property 11,521 7,261 — 14,038 9,293 — Commercial and industrial 3,987 3,067 — 4,610 3,428 — Residential real estate 13,460 11,793 — 20,270 18,016 — Home equity 5,337 4,523 — 5,924 5,036 — Consumer 499 362 — 846 671 — Total impaired loans without a specific allowance 35,141 27,291 — 45,688 36,444 — With a specific allowance recorded: Commercial real estate: Land and construction — — — — — — Improved property 2,154 2,133 59 — — — Commercial and industrial 309 307 12 — — — Residential real estate 5,519 5,078 13 — — — Home equity 826 796 7 — — — Consumer 144 103 1 — — — Total impaired loans with a specific allowance 8,952 8,417 92 — — — Total impaired loans $ 44,093 $ 35,708 $ 92 $ 45,688 $ 36,444 $ — (1) The difference between the unpaid principal balance and the recorded investment generally reflects amounts that have been previously charged-off and fair market value adjustments on acquired impaired loans. Impaired Loans For the Three Months Ended March 31, 2019 For the Three Months Ended March 31, 2018 (unaudited, in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related specific allowance recorded: Commercial real estate: Land and construction $ 143 $ — $ 520 $ — Improved property 8,277 — 11,591 345 Commercial and industrial 3,246 — 2,791 2 Residential real estate 13,774 — 18,367 66 Home equity 4,780 — 5,070 5 Consumer 450 — 878 3 Total impaired loans without a specific allowance 30,670 — 39,217 421 With a specific allowance recorded: Commercial real estate: Land and construction — — — — Improved property 1,067 14 2,105 — Commercial and industrial 154 3 — — Residential real estate 2,539 58 — — Home equity 398 8 — — Consumer 52 1 — — Total impaired loans with a specific allowance 4,210 84 2,105 — Total impaired loans $ 34,880 $ 84 $ 41,322 $ 421 The following tables present the recorded investment in non-accrual loans and TDRs: Non-accrual Loans (1) (unaudited, in thousands) March 31, 2019 December 31, 2018 Commercial real estate: Land and construction $ 285 $ — Improved property 8,639 8,413 Total commercial real estate 8,924 8,413 Commercial and industrial 3,212 3,260 Residential real estate 12,871 13,831 Home equity 4,813 4,610 Consumer 407 586 Total $ 30,227 $ 30,700 (1) At March 31, 2019, there was one borrower with a loan greater than $ 1.0 3.3 1.0 3.4 TDRs March 31, 2019 December 31, 2018 (unaudited, in thousands) Accruing Non-Accrual Total Accruing Non-Accrual Total Commercial real estate: Land and construction $ — $ — $ — $ — $ — $ — Improved property 755 1,378 2,133 880 1,529 2,409 Total commercial real estate 755 1,378 2,133 880 1,529 2,409 Commercial and industrial 162 145 307 168 169 337 Residential real estate 4,000 1,078 5,078 4,185 921 5,106 Home equity 506 290 796 426 198 624 Consumer 58 45 103 85 38 123 Total $ 5,481 $ 2,936 $ 8,417 $ 5,744 $ 2,855 $ 8,599 As of March 31, 2019 and December 31, 2018, there were no TDRs greater than $1.0 million. The concessions granted in the majority of loans reported as accruing and non-accrual TDRs are extensions of the maturity date or the amortization period, reductions in the interest rate below the prevailing market rate for loans with comparable characteristics, and/or permitting interest-only payments for longer than three months. WesBanco had unfunded commitments to debtors whose loans were classified as impaired of $0.1 million as of March 31, 2019 and December 31, 2018.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	NOTE 6. LEASES Operating leases are recorded as a right of use (“ROU”) asset and operating lease liability, included in premises and equipment, net and other liabilities, respectively, on the consolidated balance sheet beginning January 1, 2019 when WesBanco adopted ASU 2016-02 prospectively. Operating lease ROU assets represent the right to use an underlying asset during the lease term and operating lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and operating lease liabilities are recognized at lease commencement based on the present value of the remaining lease payments using a discount rate that represents our incremental borrowing rate at the lease commencement date. Operating lease expense, which is comprised of amortization of the ROU asset and the implicit interest accreted on the operating lease liability, is recognized on a straight-line basis over the lease term, and is recorded primarily in net occupancy expense in the consolidated statements of comprehensive income. Operating leases relate primarily to bank branches, office space and license agreements with remaining lease terms of generally 1 to 21 years, which include options for multiple five ten Future minimum lease payments under non-cancellable leases with initial or remaining lease terms in excess of one year at March 31, 2019 are as follows ( unaudited, in thousands Year Amount 2020 912 2021 1,875 2022 2,105 2023 2,875 2024 and thereafter 18,032 Total lease payments $ 25,799 Less: Interest (3,810 ) Present value of lease liabilties $ 21,989

Derivatives and Hedging Activit

Derivatives and Hedging Activities	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives and Hedging Activities	NOTE 7. DERIVATIVES AND HEDGING ACTIVITIES Risk Management Objective of Using Derivatives WesBanco is exposed to certain risks arising from both its business operations and economic conditions. WesBanco principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. WesBanco manages economic risks, including interest rate, liquidity, and credit risk, primarily by managing the amount, sources, and duration of its assets and liabilities. WesBanco’s existing interest rate derivatives result from a service provided to certain qualifying customers and, therefore, are not used to manage interest rate risk in WesBanco’s assets or liabilities. WesBanco manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions. A matched book is when the Bank’s assets and liabilities are equally distributed but also have similar maturities. Loan Swaps WesBanco executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. Those interest rate swaps are simultaneously hedged by offsetting interest rate swaps that WesBanco executes with a third party, such that WesBanco minimizes its net risk exposure resulting from such transactions. As the interest rate swaps associated with this program do not meet the strict hedge accounting requirements of FASB ASC 815, changes in the fair value of both the customer swaps and the offsetting third-party swaps are recognized directly in earnings. As of March 31, 2019 and December 31, 2018, WesBanco had 46 and 43, respectively, interest rate swaps with an aggregate notional amount of $264.6 million and $229.8 million, respectively, related to this program. During the three months ended March 31, 2019 and 2018, WesBanco recognized net losses of $0.3 million and net gains of $0.2 million, respectively, related to the changes in fair value of these swaps. Additionally, WesBanco recognized $0.7 million and $0.4 million of income for the related swap fees for the three months ended March 31, 2019 and 2018, respectively. Mortgage Loans Held for Sale and Loan Commitments Certain residential mortgage loans are originated for sale in the secondary mortgage loan market. These loans are classified as held for sale and carried at fair value as WesBanco has elected the fair value option. Fair value is determined based on rates obtained from the secondary market for loans with similar characteristics. WesBanco sells loans to the secondary market on a mandatory or best efforts basis. The loans sold on a mandatory basis are not committed to an investor until the loan is closed with the borrower. WesBanco enters into forward TBA contracts to manage the interest rate risk between the loan commitment and the closing of the loan. The loans sold on a best efforts basis are committed to an investor simultaneous to the interest rate commitment with the borrower. Fair Values of Derivative Instruments on the Balance Sheet All derivatives are carried on the consolidated balance sheet at fair value. Derivative assets are classified in the consolidated balance sheet under other assets, and derivative liabilities are classified in the consolidated balance sheet under other liabilities. Changes in fair value are recognized in earnings. None of WesBanco’s ASC 815. The table below presents the fair value of WesBanco’s derivative financial instruments as well as their classification on the Balance Sheet as of March 31, 2019 and December 31, 2018: March 31, 2019 December 31, 2018 (unaudited, in thousands) Notional or Contractual Amount Asset Derivatives Liability Derivatives Notional or Contractual Amount Asset Derivatives Liability Derivatives Derivatives Loan Swaps: Interest rate swaps $ 264,628 $ 7,009 $ 7,752 $ 229,778 $ 4,650 $ 5,081 Other contracts: Interest rate loan commitments 30,065 155 — 16,113 125 — Forward TBA contracts 34,500 — 260 20,000 — 234 Total derivatives $ 7,164 $ 8,012 $ 4,775 $ 5,315 Effect of Derivative Instruments on the Income Statement The table below presents the change in the fair value of the Company’s derivative financial instruments reflected within the other non-interest income line item of the consolidated income statement for the three months ended March 31, 2019 and 2018, respectively. For the Three Months Ended (unaudited, in thousands) Location of Gain/(Loss) 2019 2018 Interest rate swaps Other income $ (312 ) $ 167 Interest rate loan commitments Mortgage banking income 30 136 Forward TBA contracts Mortgage banking income (334 ) 410 Total $ (616 ) $ 713 Credit-risk-related Contingent Features WesBanco has agreements with its derivative counterparties that contain a provision where if WesBanco defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then WesBanco could also be declared in default on its derivative obligations. WesBanco also has agreements with certain of its derivative counterparties that contain a provision where if WesBanco fails to maintain its status as either a well or adequately capitalized institution, then the counterparty could terminate the derivative positions and WesBanco would be required to settle its obligations under the agreements. WesBanco has minimum collateral posting thresholds with certain of its derivative counterparties and has posted collateral with a market value of $11.8 million as of March 31, 2019. If WesBanco had breached any of these provisions at March 31, 2019, it could have been required to settle its obligations under the agreements at the termination value and would have been required to pay any additional amounts due in excess of amounts previously posted as collateral with the respective counterparty.

Pension & Postretirement Medica

Pension & Postretirement Medical Benefit Plans	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Pension Plan	NOTE 8. PENSION & POSTRETIREMENT MEDICAL BENEFIT PLANS The following table presents the net periodic pension cost for WesBanco’s Defined Benefit Pension Plan (the “Plan”) and the related components: For the Three Months Ended March 31, (unaudited, in thousands) 2019 2018 Service cost – benefits earned during year $ 554 $ 699 Interest cost on projected benefit obligation 1,298 1,114 Expected return on plan assets (2,187 ) (2,204 ) Amortization of prior service cost 7 6 Amortization of net loss 799 753 Net periodic pension cost $ 471 $ 368 The Plan covers all employees of WesBanco and its subsidiaries who were hired on or before August 1, 2007 who satisfy minimum age and length of service requirements, and is not available to employees hired after such date. A minimum required contribution of $4.8 million is due for 2019, which could be all or partially offset by the Plan’s $52.5 million available credit balance. WesBanco currently expects to make a voluntary contribution of $3.0 million to the Plan in June 2019. WesBanco assumed FFKT’s postretirement medical benefit plan, which had a liability totaling $15.0 million at the acquisition date. The plan covers FFKT employees who were hired before January 1, 2016 and meet certain age and length of full-time service requirements. The plan was modified in August 2018, which reduced the number of eligible employees. The modification resulted in a $5.5 million unrealized gain, which was recorded in Accumulated Other Comprehensive Income net of tax and will be recognized over the life of the plan participants, estimated to be approximately 17 years. Benefits provided under this plan are unfunded, and payments to the plan participants are made by WesBanco. The net periodic cost for the postretirement medical benefit plan totaled $58 thousand for the three months ended March 31, 2019. The net periodic cost consisted of $113 thousand in interest cost on projected benefit obligation, which was partially offset by a $55 thousand benefit of prior service cost amortization.

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurement	NOTE 9. FAIR VALUE MEASUREMENT Fair value estimates are based on quoted market prices, if available, quoted market prices of similar assets or liabilities, or the present value of expected future cash flows and other valuation techniques. These valuations are significantly affected by discount rates, cash flow assumptions, and risk assumptions used. Therefore, fair value estimates may not be substantiated by comparison to independent markets and are not intended to reflect the proceeds that may be realizable in an immediate settlement of the instruments. Fair value is determined at one point in time and is not representative of future value. These amounts do not reflect the total value of a going concern organization. Management does not have the intention to dispose of a significant portion of its assets and liabilities, and therefore the unrealized gains or losses should not be interpreted as a forecast of future earnings and cash flows. The following is a discussion of assets and liabilities measured at fair value on a recurring basis and valuation techniques applied: Investment securities: Loans held for sale: Derivatives: WesBanco enters into forward TBA contracts to manage the interest rate risk between the loan commitments to the customer and the closing of the loan for loans that will be sold on a mandatory basis to secondary market investors. The forward TBA contract is reported at fair value in other assets and other liabilities on the consolidated balance sheet with any resulting gain or loss recorded in current period’s earnings as mortgage banking income. WesBanco determines the fair value for derivatives using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects contractual terms of the derivative, including the period to maturity, and uses observable market-based inputs, including interest rate curves and implied volatilities. WesBanco incorporates credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. We may be required from time to time to measure certain assets and liabilities at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from the application of lower of cost or market accounting or write-downs of individual assets and liabilities. Other real estate owned and repossessed assets: The fair value amounts presented in the table below are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The following tables set forth WesBanco’s financial assets and liabilities that were accounted for at fair value on a recurring and nonrecurring basis by level within the fair value hierarchy as of March 31, 2019 and December 31, 2018: March 31, 2019 Fair Value Measurements Using: (unaudited, in thousands) March 31, 2019 Quoted Prices in Active Markets for Identical Assets (level 1) Significant Other Observable Inputs (level 2) Significant Unobservable Inputs (level 3) Recurring fair value measurements Equity securities $ 11,978 $ 11,978 $ — $ — Available-for-sale debt securities U.S. Treasury 19,712 — 19,712 — U.S. Government sponsored entities and agencies 139,290 — 139,290 — Residential mortgage-backed securities and collateralized mortgage obligations of government agencies 1,582,784 — 1,582,784 — Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 177,005 — 177,005 — Obligations of state and political subdivisions 186,067 — 184,484 1,583 Corporate debt securities 40,231 — 40,231 — Total available-for-sale $ 2,145,089 $ — $ 2,143,506 $ 1,583 Loans held for sale 8,358 — 8,358 — Other assets—interest rate derivatives agreements 7,009 — 7,009 — Total assets recurring fair value measurements $ 2,172,434 $ 11,978 $ 2,158,873 $ 1,583 Other liabilities—interest rate derivatives agreements $ 7,752 $ — $ 7,752 $ — Total liabilities recurring fair value measurements $ 7,752 $ — $ 7,752 $ — Nonrecurring fair value measurements Other real estate owned and repossessed assets 6,001 — — 6,001 Total nonrecurring fair value measurements $ 6,001 $ — $ — $ 6,001 December 31, 2018 Fair Value Measurements Using: (in thousands) December 31, 2018 Quoted Prices in Active Markets for Identical Assets (level 1) Significant Other Observable Inputs (level 2) Significant Unobservable Inputs (level 3) Recurring fair value measurements Equity securities $ 11,737 $ 11,737 $ — $ — Available-for-sale debt securities U.S. Treasury 19,878 — 19,878 — U.S. Government sponsored entities and agencies 141,652 — 141,652 — Residential mortgage-backed securities and 1,561,255 — 1,561,255 — Commercial mortgage-backed securities and 168,972 — 168,972 — Obligations of state and political subdivisions 185,114 — 183,611 1,503 Corporate debt securities 37,258 — 37,258 — Total available-for-sale debt securities $ 2,114,129 $ — $ 2,112,626 $ 1,503 Loans held for sale 8,994 — 8,994 — Other assets—interest rate derivatives agreements 4,650 — 4,650 — Total assets recurring fair value measurements $ 2,139,510 $ 11,737 $ 2,126,270 $ 1,503 Other liabilities—interest rate derivatives agreements $ 5,081 $ — $ 5,081 $ — Total liabilities recurring fair value measurements $ 5,081 $ — $ 5,081 $ — Nonrecurring fair value measurements Other real estate owned and repossessed assets 7,265 — — 7,265 Total nonrecurring fair value measurements $ 7,265 $ — $ — $ 7,265 WesBanco’s policy is to recognize transfers between levels as of the actual date of the event or change in circumstances that caused the transfer. There were no significant transfers between level 1, 2 or 3 for the three months ended March 31, 2019 or for the year ended December 31, 2018. The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which WesBanco has utilized level 3 inputs to determine fair value: Quantitative Information about Level 3 Fair Value Measurements (unaudited, in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range (Weighted Average) March 31, 2019 Other real estate owned and repossessed assets $ 6,001 Appraisal of collateral (1), (2) December 31, 2018: Other real estate owned and repossessed assets $ 7,265 Appraisal of collateral (1), (2) (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs, which are not identifiable. (2) Includes estimated liquidation expenses and numerous dissimilar qualitative adjustments by management, which are not identifiable. The estimated fair values of WesBanco’s financial instruments are summarized below: Fair Value Measurements at March 31, 2019 (unaudited, in thousands) Carrying Amount Fair Value Estimate Quoted Prices in Active Markets for Identical Assets (level 1) Significant Other Observable Inputs (level 2) Significant Unobservable Inputs (level 3) Financial Assets Cash and due from banks $ 336,894 $ 336,894 $ 336,894 $ — $ — Equity securities 11,978 11,978 11,978 — — Available-for- sale d 2,145,089 2,145,089 — 2,143,506 1,583 Held-to-maturity d ebt securities 936,484 948,641 — 948,077 564 Net loans 7,617,215 7,498,726 — — 7,498,726 Loans held for sale 8,358 8,358 — 8,358 — Other assets—interest rate derivatives 7,009 7,009 — 7,009 — Accrued interest receivable 39,662 39,662 39,662 — — Financial Liabilities Deposits 8,916,331 8,919,921 7,492,056 1,427,865 — Federal Home Loan Bank borrowings 1,031,796 1,028,648 — 1,028,648 — Other borrowings 301,547 301,915 298,322 3,593 — Subordinated debt and junior subordinated debt 179,632 166,298 — 166,298 — Other liabilities—interest rate derivatives 7,752 7,752 — 7,752 — Accrued interest payable 6,030 6,030 6,030 — — Fair Value Measurements at December 31, 2018 (in thousands) Carrying Fair Value Quoted Prices in (level 1) Significant Other (level 2) Significant (level 3) Financial Assets Cash and due from banks $ 169,186 $ 169,186 $ 169,186 $ — $ — Equity securities 11,737 11,737 11,737 — — Available-for-sale debt securities 2,114,129 2,114,129 — 2,112,626 1,503 Held-to-maturity debt securities 1,020,934 1,020,743 — 1,020,195 548 Net loans 7,607,333 7,422,825 — — 7,422,825 Loans held for sale 8,994 8,994 — 8,994 — Other assets—interest rate derivatives 4,650 4,650 — 4,650 — Accrued interest receivable 38,853 38,853 38,853 — — Financial Liabilities Deposits 8,831,633 8,836,390 7,376,023 1,460,367 — Federal Home Loan Bank borrowings 1,054,174 1,051,401 — 1,051,401 — Other borrowings 290,522 290,854 288,918 1,936 — Subordinated debt and junior subordinated debt 189,842 174,448 — 174,448 — Other liabilities—interest rate derivatives 5,081 5,081 — 5,081 — Accrued interest payable 4,627 4,627 4,627 — — The following methods and assumptions were used to measure the fair value of financial instruments recorded at cost on WesBanco’s consolidated balance sheets: Cash and due from banks: The carrying amount for cash and due from banks is a reasonable estimate of fair value. Held-to-maturity debt securities: Net loans: Fair values for loans are estimated using a discounted cash flow methodology. The discount rates take into account interest rates currently being offered to customers for loans with similar terms, the credit risk associated with the loan and other market factors, including liquidity. WesBanco believes the discount rates are consistent with transactions occurring in the marketplace for both performing and distressed loan types. The carrying value is net of the allowance for loan losses and other associated premiums and discounts. Due to the significant judgment involved in evaluating credit quality, loans are classified within level 3 of the fair value hierarchy. Accrued interest receivable: The carrying amount of accrued interest receivable approximates its fair value . Deposits: The carrying amount is considered a reasonable estimate of fair value for demand, savings and other variable rate deposit accounts. The fair value of fixed maturity certificates of deposit is estimated by a discounted cash flow method using rates currently offered for deposits of similar remaining maturities. Federal Home Loan Bank borrowings: The fair value of FHLB borrowings is based on rates currently available to WesBanco for borrowings with similar terms and remaining maturities. Other borrowings: The carrying amount of federal funds purchased and overnight sweep accounts generally approximate fair value. Other repurchase agreements are based on quoted market prices if available. If market prices are not available, for certain fixed and adjustable rate repurchase agreements, then quoted market prices of similar instruments are used. Subordinated debt and junior subordinated debt: The fair value of subordinated debt is estimated using discounted cash flow analyses based on the current borrowing rates for similar types of borrowing arrangements. Due to the pooled nature of junior subordinated debt owed to unconsolidated subsidiary trusts, which are not actively traded, estimated fair value is based on recent similar transactions of single-issuer trust preferred securities. Accrued interest payable: The carrying amount of accrued interest payable approximates its fair value. Off-balance sheet financial instruments:

Shareholders' Equity

Shareholders' Equity	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	NOTE 10. SHAREHOLDERS’ EQUITY The activity in shareholders equity for the three months ended March 31, 2019 and 2018 is as follows: WESBANCO, INC. CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY For the Three Months Ended March 31, 2019 and 2018 Accumulated Common Stock Other Deferred (unaudited, in thousands, except Shares Capital Retained Treasury Comprehensive Benefits for shares and per share amounts) Outstanding Amount Surplus Earnings Stock (Loss) Income Directors Total December 31, 2018 54,598,134 $ 113,758 $ 1,166,701 $ 737,581 $ (274 ) $ (37,871 ) $ (1,068 ) $ 1,978,827 Net income — — — 40,337 — — — 40,337 Other comprehensive income — — — — — 19,773 — 19,773 Comprehensive income — — — — — — — 60,110 Common dividends declared — — — (16,916 ) — — — (16,916 ) Treasury shares acquired (7 ) — — — — — — — Stock options exercised 1,000 — (25 ) — 45 — — 20 Stock compensation expense — — 1,075 — — — — 1,075 Deferred benefits for directors - net — — 10 — — — 13 23 March 31, 2019 54,599,127 $ 113,758 $ 1,167,761 $ 761,002 $ (229 ) $ (18,098 ) $ (1,055 ) $ 2,023,139 December 31, 2017 44,043,244 $ 91,756 $ 684,730 $ 651,357 $ — $ (31,495 ) $ (1,027 ) $ 1,395,321 Net income — — — 33,529 — — — 33,529 Other comprehensive loss — — — — — (14,518 ) — (14,518 ) Comprehensive income — — — — — — — 19,011 Common dividends declared — — — (12,775 ) — — — (12,775 ) Adoption of accounting standard — — — 1,063 — (1,063 ) — — Stock options exercised 17,713 37 523 — — — — 560 Stock compensation expense — — 909 — — — — 909 Deferred benefits for directors - net — — 7 — — — (7 ) — March 31, 2018 44,060,957 $ 91,793 $ 686,169 $ 673,174 $ — $ (47,076 ) $ (1,034 ) $ 1,403,026

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2019
Text Block [Abstract]
Revenue Recognition	NOTE 11. REVENUE RECOGNITION WesBanco adopted ASU 2014-09 as of January 1, 2018 under the modified retrospective approach and there was no material impact on WesBanco’s Consolidated Financial statements. Interest income, net securities gains (losses) and bank-owned life insurance are not in scope of ASC 606, Revenue from Contracts with Customers Trust fees: Fees are earned over a period of time between monthly and annually, per the related fee schedule. The fees are earned ratably over the period for investment, safekeeping and other services performed by WesBanco. The fees are accrued when earned based on the daily asset value on the last day of the quarter. In most cases, the fees are directly debited from the customer account. Service charges on deposits: There are monthly service charges for both commercial and personal banking customers, which are earned over the month per the related fee schedule based on the customers’ deposits. There are also transaction-based fees, which are earned based on specific transactions or customer activity within the customers’ deposit accounts. These are earned at the time the transaction or customer activity occurs. The fees are debited from the customer account. Net securities brokerage revenue: Commission income is earned based on customer transactions and management of investments. The commission income from customers’ transactions is recognized when the transaction is complete. The commission income from the management of investments is earned continuously over a quarterly period. Payment processing fees: Electronic banking fees: Mortgage banking income: Income is earned when WesBanco-originated loans are sold to an investor on the secondary market. The investor bids on the loans. If the price is accepted, WesBanco delivers the loan documents to the investor. Once received and approved by the investor, revenue is recognized and the loans are derecognized from the Consolidated Balance Sheet. Prior to the loans being sold, they are classified as loans held for sale. Additionally, the changes in the fair value of the loans held for sale, loan commitments and related derivatives are included in mortgage banking income. Net gain or loss on sale of other real estate owned: Net gain or loss is recorded when other real estate is sold to a third party and the Bank collects substantially all of the consideration to which WesBanco is entitled in exchange for the transfer of the property. The following table summarizes the point of revenue recognition and the income recognized for each of the revenue streams for the three months ended March 31, 2019 and 2018, respectively: For the Three Months Ended Point of Revenue March 31, (unaudited, in thousands) Recognition 2019 2018 Revenue Streams Trust fees Trust account fees Over time $ 5,056 $ 4,292 WesMark fees Over time 2,059 2,211 Total trust fees 7,115 6,503 Service charges on deposits Commercial banking fees Over time 468 407 Personal service charges At a point in time & over time 6,081 4,415 Total service charges on deposits 6,549 4,822 Net securities brokerage revenue Annuity commissions At a point in time 1,362 1,200 Equity and debt security trades At a point in time 102 102 Managed money Over time 157 141 Trail commissions Over time 239 227 Total net securities brokerage revenue 1,860 1,670 Payment processing fees (1) At a point in time & over time 648 — Electronic banking fees At a point in time 5,892 4,829 Mortgage banking income At a point in time 1,056 1,004 Gain/loss on sale of OREO/other assets At a point in time 136 262 (1) Payment processing fees are included in other non-interest income.

Comprehensive Income_(Loss)

Comprehensive Income/(Loss)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Comprehensive Income/(Loss)	NOTE 12. COMPREHENSIVE INCOME/(LOSS) The activity in accumulated other comprehensive income for the three months ended March 31, 2019 and 2018 is as follows: Accumulated Other Comprehensive Income/(Loss) (1) (unaudited, in thousands) Defined Unrealized Gains (Losses) on Debt Securities Unrealized Gains Total Balance at December 31, 2018 $ (16,542 ) $ (21,522 ) $ 193 $ (37,871 ) Other comprehensive income before reclassifications — 19,302 — 19,302 Amounts reclassified from accumulated other comprehensive income 543 (33 ) (39 ) 471 Period change 543 19,269 (39 ) 19,773 Balance at March 31, 2019 $ (15,999 ) $ (2,253 ) $ 154 $ (18,098 ) Balance at December 31, 2017 $ (18,626 ) $ (13,250 ) $ 381 $ (31,495 ) Other comprehensive income before reclassifications — (14,905 ) — (14,905 ) Amounts reclassified from accumulated other comprehensive income 437 — (50 ) 387 Period change 437 (14,905 ) (50 ) (14,518 ) Adoption of Accounting Standard ASU 2016-01 — (1,063 ) — (1,063 ) Balance at March 31, 2018 $ (18,189 ) $ (29,218 ) $ 331 $ (47,076 ) (1) All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 23%. The following table provides details about amounts reclassified from accumulated other comprehensive income for the three months ended March 31, 2019 and 2018: Details about Accumulated Other Comprehensive Income/(Loss) Components Amounts Reclassified from Affected Line Item in the Statement of Net Income (unaudited, in thousands) 2019 2018 Debt securities available-for-sale (1) Net securities gains reclassified into earnings $ (43 ) $ — Net securities gains (Non-interest income) Related income tax expense 10 — Provision for income taxes Net effect on accumulated other comprehensive income for the period (33 ) — Debt securities held-to-maturity (1) Amortization of unrealized gain transferred from available-for-sale (55 ) (66 ) Interest and dividends on securities (Interest and dividend income) Related income tax expense 16 16 Provision for income taxes Net effect on accumulated other comprehensive income for the period (39 ) (50 ) Defined benefit plans (2) Amortization of net loss and prior service costs 750 756 Employee benefits (Non-interest expense) Related income tax benefit (207 ) (319 ) Provision for income taxes Net effect on accumulated other comprehensive income for the period 543 437 Total reclassifications for the period $ 471 $ 387 (1) For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income, see Note 4, “Securities.” (2) Included in the computation of net periodic pension cost. See Note 8, “Pension & Postretirement Medical Benefit Plans” for additional detail.

Commitments and Contingent Liab

Commitments and Contingent Liabilities	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingent Liabilities	NOTE 13. COMMITMENTS AND CONTINGENT LIABILITIES Commitments — In the normal course of business, WesBanco offers off-balance sheet credit arrangements to enable its customers to meet their financing objectives. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. WesBanco’s exposure to credit losses in the event of non-performance by the other parties to the financial instruments for commitments to extend credit and standby letters of credit is limited to the contractual amount of those instruments. WesBanco uses the same credit policies in making commitments and conditional obligations as for all other lending. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The allowance for credit losses associated with commitments was $2.0 million and $0.7 million as of March 31, 2019 and December 31, 2018, respectively, and is included in other liabilities on the Consolidated Balance Sheets. Letters of credit are conditional commitments issued by banks to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements, including normal business activities, bond financing and similar transactions. Letters of credit are considered guarantees. The liability associated with letters of credit was $0.2 million as of March 31, 2019 and December 31, 2018. Contingent obligations to purchase loans funded by other entities include affordable housing plan guarantees, credit card guarantees, loans sold with recourse as well as obligations to the FHLB. Affordable housing plan guarantees are performance guarantees for various building project loans. The guarantee amortizes as the loan balances decrease. Credit card guarantees are credit card balances not owned by WesBanco, whereby the Bank guarantees the performance of the cardholder. The following table presents total commitments to extend credit, guarantees and various letters of credit outstanding: March 31, December 31, (unaudited, in thousands) 2019 2018 Lines of credit $ 1,919,110 $ 1,894,030 Loans approved but not closed 333,186 258,778 Overdraft limits 153,469 153,572 Letters of credit 43,587 42,841 Contingent obligations and other guarantees 50,159 61,509 Contingent Liabilities — WesBanco is a party to various legal and administrative proceedings and claims. While any litigation contains an element of uncertainty, management does not believe that a material loss related to such proceedings or claims pending or known to be threatened is reasonably possible.

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Business Segments	NOTE 14. BUSINESS SEGMENTS WesBanco operates two Condensed financial information by business segment is presented below: Trust and Community Investment (unaudited, in thousands) Banking Services Consolidated For the Three Months ended March 31, 2019: Interest and dividend income $ 119,053 $ — $ 119,053 Interest expense 20,692 — 20,692 Net interest income 98,361 — 98,361 Provision for credit losses 2,507 — 2,507 Net interest income after provision for credit losses 95,854 — 95,854 Non-interest income 20,658 7,115 27,773 Non-interest expense 70,275 4,157 74,432 Income before provision for income taxes 46,237 2,958 49,195 Provision for income taxes 8,237 621 8,858 Net income $ 38,000 $ 2,337 $ 40,337 For the Three Months ended March 31, 2018: Interest and dividend income $ 86,417 $ — $ 86,417 Interest expense 13,125 — 13,125 Net interest income 73,292 — 73,292 Provision for credit losses 2,168 — 2,168 Net interest income after provision for credit losses 71,124 — 71,124 Non-interest income 17,477 6,503 23,980 Non-interest expense 50,894 3,677 54,571 Income before provision for income taxes 37,707 2,826 40,533 Provision for income taxes 6,411 593 7,004 Net income $ 31,296 $ 2,233 $ 33,529 Total non-fiduciary assets of the trust and investment services segment were $4.1 million (including $ 2.4

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Basis of presentation	Basis of presentation — The accompanying unaudited interim financial statements of WesBanco, Inc. and its consolidated subsidiaries (“WesBanco”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2018. WesBanco’s interim financial statements have been prepared following the significant accounting policies disclosed in Note 1 of the Notes to the Consolidated Financial Statements of its 2018 Annual Report on Form 10-K filed with the Securities and Exchange Commission. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly WesBanco’s financial position and results of operations for each of the interim periods presented. Certain prior period amounts have been reclassified to conform to the current period presentation. Such reclassifications had no impact on WesBanco’s net income and stockholders’ equity. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year.
Recent accounting pronouncements	Recent accounting pronouncements — In August 2018, the FASB issued ASU 2018-14, “Compensation—Retirement Benefits—Defined Benefit Plans—General (Topic 715-20): Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans.” This ASU modifies ASC 715-20 to improve disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The guidance is effective for fiscal years ending after December 15, 2020. Early adoption is permitted. WesBanco is currently assessing the impact of ASU 2018-14 on WesBanco’s Consolidated Financial Statements. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement – Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU modifies the disclosure objective paragraphs of ASC 820 to eliminate (1) “at a minimum” from the phrase “an entity shall disclose at a minimum” and (2) other similar “open ended” disclosure requirements to promote the appropriate exercise of discretion of entities. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted, including adoption in an interim period. WesBanco is currently assessing the impact of ASU 2018-13 on WesBanco’s Consolidated Financial Statements. In September 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses (Topic 326)”, which will require entities to use a new forward-looking “expected loss” model on trade and other receivables, held-to-maturity debt securities, loans and other instruments that generally will result in the earlier recognition of allowances for credit losses. For available-for-sale debt securities with unrealized losses, entities will measure credit losses in a manner similar to what they do today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. Entities will have to disclose significantly more information, including information they use to track credit quality by year of origination for most financing receivables. Public business entities must apply the new requirements for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which for WesBanco will be effective for the fiscal year beginning January 1, 2020. Early adoption is permitted for fiscal years beginning after December 15, 2018. WesBanco formed a cross-functional team to oversee the implementation of this ASU, and has completed an initial data gap assessment, finalized the loan segmentation procedures, and is currently evaluating the various forecasting and modeling assumptions, including qualitative factors, that will be used to estimate the initial current expected credit loss allowance. Substantial progress has been made on the identification and staging of data, development of models, refinement of economic forecasting processes, and documentation of accounting policy decisions. In conjunction with this implementation, WesBanco is reviewing business processes and evaluating potential changes to the control environment. Acquired loans or pools of loans that have experienced more-than-insignificant credit deterioration are deemed to be purchased credit deteriorated (“PCD”) loans, and are grossed-up on day 1 by the initial credit estimate through goodwill as opposed to the provision for credit losses. At acquisition, WesBanco will consider several factors as indicators that an acquired loan or pool of loans has experienced more-than-insignificant credit deterioration. These factors may include loan 30 days or more past due, loans with an internal risk grade of below average or lower, loans classified as non-accrual by the acquired institution, materiality of the credit and loans that have been previously modified in a troubled debt restructuring. WesBanco plans to perform several parallel runs of the new methodology in 2019 prior to adoption of the ASU. WesBanco currently anticipates that an increase to the allowance for credit losses will be recognized upon adoption to provide for the expected credit losses over the estimated life of the financial assets. The magnitude of the increase will depend on economic conditions and trends in the loan portfolio at the time of adoption. In February 2016, the FASB issued ASU 2016-02, entities to recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. The principal difference from previous guidance is that the lease assets and lease liabilities arising from operating leases were not previously recognized in the balance sheet. Public business entities must apply the new requirements for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. For WesBanco, this update was effective for the fiscal year beginning January 1, 2019. In January 2018, the FASB issued ASU 2018-01, which allows entities the option to apply the provisions of the new lease guidance at the effective date without adjusting the comparative periods presented. In July 2018, the FASB issued ASU 2018-10, which provides narrow-scope improvements to the lease standard and ASU 2018-11, which allows entities to choose an additional transition method, under which an entity initially applies the new lease standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. Under this transitional method, the entity shall recognize and measure the leases that exist at the adoption date and the prior comparative periods are not adjusted. In August 2017, the FASB issued ASU 2017-12, “Targeted Improvements to Accounting for Hedging Activities.” The new guidance will make more financial and nonfinancial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. It is intended to more closely align hedge accounting with companies’ risk management strategies, simplify the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. For WesBanco, this update was effective for the fiscal year beginning January 1, 2019. Upon adoption, WesBanco reclassified $67.3 million of callable held-to-maturity municipal debt securities to available-for-sale debt securities. In October 2018, the FASB issued ASU 2018-16, “Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes.” This ASU modifies ASC 815 for eligible benchmark interest rates. Due to concerns about the sustainability of the London Interbank Offered Rate (LIBOR), the Federal Reserve initiated an effort to introduce an alternative reference rate in the United States. The Overnight Index Swap (OIS) rate, which is based on SOFR is permitted as a U.S. benchmark interest rate for hedge accounting purposes. The guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. For WesBanco, this update was effective for the fiscal year beginning January 1, 2019. The adoption of this pronouncement did not have a material impact on WesBanco’s Consolidated Financial Statements.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables) - Farmers Capital Bank Corporation [Member]	3 Months Ended
	Mar. 31, 2019
Summary of Purchase Price of Acquisition and Resulting Goodwill	The preliminary purchase price of the FFKT acquisition and resulting goodwill is summarized as follows: (unaudited, in thousands) August 20, 2018 Purchase price: Fair value of WesBanco shares issued $ 391,267 Cash consideration for outstanding FFKT shares 37,634 Total purchase price $ 428,901 Fair value of: Tangible assets acquired $ 1,369,186 Core deposit and other intangible assets acquired 39,992 Liabilities assumed (1,429,834 ) Net cash received in the acquisition 230,139 Fair value of net assets acquired 209,483 Goodwill recognized $ 219,418
Allocation of Purchase Price of Assets Acquired and Liabilities Assumed	The following table presents the preliminary allocation of the purchase price of the assets acquired and the liabilities assumed at the date of acquisition, as WesBanco intends to finalize its accounting for the acquisition of FFKT within one year from the date of acquisition: (unaudited, in thousands) August 20, 2018 Assets acquired Cash and due from banks $ 230,139 Securities 239,321 Loans 1,025,800 Goodwill and other intangible assets 259,410 Accrued income and other assets 104,065 Total assets acquired $ 1,858,735 Liabilities assumed Deposits $ 1,330,328 Borrowings 71,780 Accrued expenses and other liabilities 27,726 Total liabilities assumed $ 1,429,834 Net assets acquired $ 428,901
Purchase Price Allocation Adjustment [Member]
Allocation of Purchase Price of Assets Acquired and Liabilities Assumed	The following table presents the changes in the allocation of the purchase price of the assets acquired and the liabilities assumed at the date of the acquisition previously reported as of December 31, 2018: (unaudited, in thousands) August 20, 2018 Goodwill recognized as of December 31, 2018 $ 220,240 Change in fair value of net assets acquired: Assets Loans 24 Premises and equipment 188 Other real estate owned (749 ) Accrued income and other assets 1,409 Liabilities Accrued expenses and other liabilities (50 ) Fair value of net assets acquired $ 822 Decrease in goodwill recognized (822 ) Goodwill recognized as of March 31, 2019 $ 219,418

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Summary of Earnings Per Common Share	Earnings per common share are calculated as follows: For the Three Months Ended March 31, (unaudited, in thousands, except shares and per share amounts) 2019 2018 Numerator for both basic and diluted earnings per common share: Net income $ 40,337 $ 33,529 Denominator: Total average basic common shares outstanding 54,598,499 44,050,701 Effect of dilutive stock options and other stock compensation 107,838 117,541 Total diluted average common shares outstanding 54,706,337 44,168,242 Earnings per common share—basic $ 0.74 $ 0.76 Earnings per common share—diluted $ 0.74 $ 0.76

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities	The following table presents the fair value and amortized cost of available-for-sale and held-to-maturity debt securities: March 31, 2019 December 31, 2018 Gross Gross Estimated Gross Gross Estimated Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair (unaudited, in thousands) Cost Gains Losses Value Cost Gains Losses Value Available-for-sale debt securities U.S. Treasury $ 19,699 $ 13 $ — $ 19,712 $ 19,882 $ 3 $ (7 ) $ 19,878 U.S. Government sponsored entities and agencies 138,380 1,535 (625 ) 139,290 142,852 556 (1,756 ) 141,652 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 1,590,044 8,646 (15,906 ) 1,582,784 1,585,864 2,912 (27,521 ) 1,561,255 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 177,168 1,179 (1,342 ) 177,005 171,671 264 (2,963 ) 168,972 Obligations of states and political subdivisions 182,603 3,613 (149 ) 186,067 184,057 2,039 (982 ) 185,114 Corporate debt securities 40,114 279 (162 ) 40,231 37,730 87 (559 ) 37,258 Total available-for-sale debt securities $ 2,148,008 $ 15,265 $ (18,184 ) $ 2,145,089 $ 2,142,056 $ 5,861 $ (33,788 ) $ 2,114,129 Held-to-maturity debt securities U.S. Government sponsored entities and agencies $ 10,627 $ 7 $ (357 ) $ 10,277 $ 10,823 $ 6 $ (329 ) $ 10,500 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 142,931 359 (2,258 ) 141,032 148,300 204 (4,170 ) 144,334 Obligations of states and political subdivisions 749,652 14,435 (637 ) 763,450 828,520 8,771 (4,012 ) 833,279 Corporate debt securities 33,274 644 (36 ) 33,882 33,291 12 (673 ) 32,630 Total held-to-maturity debt securities $ 936,484 $ 15,445 $ (3,288 ) $ 948,641 $ 1,020,934 $ 8,993 $ (9,184 ) $ 1,020,743 Total debt securities $ 3,084,492 $ 30,710 $ (21,472 ) $ 3,093,730 $ 3,162,990 $ 14,854 $ (42,972 ) $ 3,134,872
Schedule of Fair Value of Available-for-sale and Held-to-maturity Securities by Contractual Maturity	March 31, 2019 (unaudited, in thousands) One Year or less One to Five Years Five to Ten Years After Ten Years Mortgage-backed securities Total Available-for-sale debt securities U.S. Treasury $ 19,712 $ — $ — $ — $ — $ 19,712 U.S. Government sponsored entities and agencies 496 5,948 18,353 16,042 98,451 139,290 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1) — — — — 1,582,784 1,582,784 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1) — — — — 177,005 177,005 Obligations of states and political subdivisions 11,253 47,331 83,027 44,456 — 186,067 Corporate debt securities 1,027 32,139 7,065 — — 40,231 Total available-for-sale debt securities $ 32,488 $ 85,418 $ 108,445 $ 60,498 $ 1,858,240 $ 2,145,089 Held-to-maturity debt securities (2) U.S. Government sponsored entities and agencies $ — $ — $ — $ — $ 10,277 $ 10,277 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies (1) — — — 141,032 141,032 Obligations of states and political subdivisions 9,048 117,502 352,924 283,976 — 763,450 Corporate debt securities — 8,680 25,202 — — 33,882 Total held-to-maturity debt securities $ 9,048 $ 126,182 $ 378,126 $ 283,976 $ 151,309 $ 948,641 Total debt securities $ 41,536 $ 211,600 $ 486,571 $ 344,474 $ 2,009,549 $ 3,093,730 (1) Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds. (2) The held-to-maturity debt securities portfolio is carried at an amortized cost of $ 936.5
Schedule of Gross Realized Gains and Losses on the Sales and Calls of Securities	The following table presents the gross realized gains and losses on sales and calls of available-for-sale and held-to-maturity debt securities, as well as gains and losses on equity securities from both sales and market adjustments from the adoption of ASU 2016-01 effective January 1, 2018 for the three months ended March 31, 2019 and 2018, respectively. For the Three Months Ended March 31, (unaudited, in thousands) 2019 2018 Debt securities: Gross realized gains $ 242 $ 7 Gross realized losses (191 ) (18 ) Net gains (losses) on debt securities $ 51 $ (11 ) Equity securities: Net unrealized gains (losses) recognized on securities still held $ 603 $ (28 ) Net realized gains recognized on securities sold 3 — Net gains (losses) on equity securities $ 606 $ (28 ) Net securities gains (losses) $ 657 $ (39 )
Schedule of Unrealized Losses on Investment Securities	The following tables provide information on unrealized losses on debt securities that have been in an unrealized loss position for less than twelve months and twelve months or more as of March 31, 2019 and December 31, 2018: March 31, 2019 Less than 12 months 12 months or more Total (unaudited, dollars in thousands) Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities U.S. Government sponsored entities and agencies $ 758 $ (4 ) 2 $ 62,057 $ (978 ) 14 $ 62,815 $ (982 ) 16 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 37,601 (198 ) 8 896,540 (17,966 ) 286 934,141 (18,164 ) 294 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 8,208 (25 ) 4 99,578 (1,317 ) 12 107,786 (1,342 ) 16 Obligations of states and political subdivisions 2,514 (7 ) 7 130,249 (779 ) 224 132,763 (786 ) 231 Corporate debt securities 8,369 (118 ) 4 9,886 (80 ) 5 18,255 (198 ) 9 Total temporarily impaired securities $ 57,450 $ (352 ) 25 $ 1,198,310 $ (21,120 ) 541 $ 1,255,760 $ (21,472 ) 566 December 31, 2018 Less than 12 months 12 months or more Total (unaudited, dollars in thousands) Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities Fair Value Unrealized Losses # of Securities U.S. Treasury $ 9,972 $ (7 ) 1 $ — $ — — $ 9,972 $ (7 ) 1 U.S. Government sponsored entities and agencies 18,926 (148 ) 8 76,385 (1,937 ) 14 95,311 (2,085 ) 22 Residential mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 285,534 (1,862 ) 44 922,698 (29,829 ) 291 1,208,232 (31,691 ) 335 Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 9,186 (18 ) 6 111,068 (2,945 ) 14 120,254 (2,963 ) 20 Obligations of states and political subdivisions 104,469 (439 ) 207 303,681 (4,555 ) 513 408,150 (4,994 ) 720 Corporate debt securities 38,791 (898 ) 18 11,452 (334 ) 5 50,243 (1,232 ) 23 Total temporarily impaired securities $ 466,878 $ (3,372 ) 284 $ 1,425,284 $ (39,600 ) 837 $ 1,892,162 $ (42,972 ) 1,121

Loans and the Allowance for C_2

Loans and the Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Schedule of Recorded Investment in Loans by Category	The recorded investment in loans is presented in the Consolidated Balance Sheets net of deferred loan fees and costs, and discounts on purchased loans. Net deferred loan costs were $ 4.2 3.2 44.8 21.0 49.3 (unaudited, in thousands) March 31, 2019 December 31, 2018 Commercial real estate: Land and construction $ 505,127 $ 528,072 Improved property 3,337,281 3,325,623 Total commercial real estate 3,842,408 3,853,695 Commercial and industrial 1,274,992 1,265,460 Residential real estate 1,628,067 1,611,607 Home equity 590,462 599,331 Consumer 330,152 326,188 Total portfolio loans 7,666,081 7,656,281 Loans held for sale 8,358 8,994 Total loans $ 7,674,439 $ 7,665,275
Summary of Changes in Allowance for Credit Losses	The following tables summarize changes in the allowance for credit losses applicable to each category of the loan portfolio: Allowance for Credit Losses By Category For the Three Months Ended March 31, 2019 and 2018 (unaudited, in thousands) Commercial Real Estate - Land and Construction Commercial Real Estate - Improved Property Commercial & Industrial Residential Real Estate Home Equity Consumer Deposit Overdraft Total Balance at December 31, 2018: Allowance for loan losses $ 4,039 $ 20,848 $ 12,114 $ 3,822 $ 4,356 $ 2,797 $ 972 $ 48,948 Allowance for loan commitments 169 33 262 12 226 39 — 741 Total beginning allowance for credit losses 4,208 20,881 12,376 3,834 4,582 2,836 972 49,689 Provision for credit losses: Provision for loan losses (6 ) (909 ) 1,050 122 223 233 575 1,288 Provision for loan commitments 25 (9 ) 1,181 (1 ) 22 1 — 1,219 Total provision for credit losses 19 (918 ) 2,231 121 245 234 575 2,507 Charge-offs — (222 ) (635 ) (320 ) (357 ) (661 ) (441 ) (2,636 ) Recoveries 12 198 378 121 47 411 99 1,266 Net charge-offs 12 (24 ) (257 ) (199 ) (310 ) (250 ) (342 ) (1,370 ) Balance at March 31, 2019: Allowance for loan losses 4,045 19,915 12,907 3,745 4,269 2,780 1,205 48,866 Allowance for loan commitments 194 24 1,443 11 248 40 — 1,960 Total ending allowance for credit losses $ 4,239 $ 19,939 $ 14,350 $ 3,756 $ 4,517 $ 2,820 $ 1,205 $ 50,826 Balance at December 31, 2017: Allowance for loan losses $ 3,117 $ 21,166 $ 9,414 $ 3,206 $ 4,497 $ 3,063 $ 821 $ 45,284 Allowance for loan commitments 119 26 173 7 212 37 — 574 Total beginning allowance for credit losses 3,236 21,192 9,587 3,213 4,709 3,100 821 45,858 Provision for credit losses: Provision for loan losses 1,090 (895 ) 919 202 262 583 (48 ) 2,113 Provision for loan commitments 57 (5 ) 3 — (4 ) 4 — 55 Total provision for credit losses 1,147 (900 ) 922 202 258 587 (48 ) 2,168 Charge-offs — (279 ) (109 ) (287 ) (576 ) (1,125 ) (267 ) (2,643 ) Recoveries 117 287 270 131 120 546 109 1,580 Net charge-offs 117 8 161 (156 ) (456 ) (579 ) (158 ) (1,063 ) Balance at March 31, 2018: Allowance for loan losses 4,324 20,279 10,494 3,252 4,303 3,067 615 46,334 Allowance for loan commitments 176 21 176 7 208 41 — 629 Total ending allowance for credit losses $ 4,500 $ 20,300 $ 10,670 $ 3,259 $ 4,511 $ 3,108 $ 615 $ 46,963
Allowance for Credit Losses and Recorded Investments in Loans	The following tables present the allowance for credit losses and recorded investments in loans by category: Allowance for Credit Losses and Recorded Investment in Loans (unaudited, in thousands) Commercial Real Estate- Land and Construction Commercial Real Estate- Improved Property Commercial and Industrial Residential Real Estate Home Equity Consumer Deposit Over- draft Total March 31, 2019 Allowance for credit losses: Allowance for loans individually evaluated for impairment $ — $ 59 $ 12 $ 13 $ 7 $ 1 $ — $ 92 Allowance for loans collectively evaluated for impairment 4,045 19,856 12,895 3,732 4,262 2,779 1,205 48,774 Allowance for loan commitments 194 24 1,443 11 248 40 — 1,960 Total allowance for credit losses $ 4,239 $ 19,939 $ 14,350 $ 3,756 $ 4,517 $ 2,820 $ 1,205 $ 50,826 Portfolio loans: Individually evaluated for impairment (1) $ — $ 2,133 $ 307 $ 5,078 $ 796 $ 103 $ — $ 8,417 Collectively evaluated for impairment 504,885 3,327,142 1,273,810 1,621,169 589,666 330,049 — 7,646,721 Acquired with deteriorated credit quality 242 8,006 875 1,820 — — — 10,943 Total portfolio loans $ 505,127 $ 3,337,281 $ 1,274,992 $ 1,628,067 $ 590,462 $ 330,152 $ — $ 7,666,081 December 31, 2018 Allowance for credit losses: Allowance for loans individually evaluated for impairment $ — $ — $ — $ — $ — $ — $ — $ — Allowance for loans collectively evaluated for impairment 4,039 20,848 12,114 3,822 4,356 2,797 972 48,948 Allowance for loan commitments 169 33 262 12 226 39 — 741 Total allowance for credit losses $ 4,208 $ 20,881 $ 12,376 $ 3,834 $ 4,582 $ 2,836 $ 972 $ 49,689 Portfolio loans: Individually evaluated for impairment (1) $ — $ — $ — $ — $ — $ — $ — $ — Collectively evaluated for impairment 527,737 3,319,672 1,264,560 1,609,177 599,331 326,063 — 7,646,540 Acquired with deteriorated credit quality 335 5,951 900 2,430 — 125 — 9,741 Total portfolio loans $ 528,072 $ 3,325,623 $ 1,265,460 $ 1,611,607 $ 599,331 $ 326,188 $ — $ 7,656,281 (1) Commercial loans greater than $ 1
Summary of Commercial Loans by Risk Grade	The following tables summarize commercial loans by their assigned risk grade: Commercial Loans by Internally Assigned Risk Grade (unaudited, in thousands) Commercial Real Estate- Land and Construction Commercial Real Estate- Improved Property Commercial & Industrial Total Commercial Loans As of March 31, 2019 Pass $ 497,566 $ 3,269,034 $ 1,241,697 $ 5,008,297 Criticized - compromised 5,599 47,464 16,628 69,691 Classified - substandard 1,962 20,783 16,667 39,412 Classified - doubtful — — — — Total $ 505,127 $ 3,337,281 $ 1,274,992 $ 5,117,400 As of December 31, 2018 Pass $ 523,707 $ 3,267,304 $ 1,245,190 $ 5,036,201 Criticized - compromised 2,297 35,566 13,847 51,710 Classified - substandard 2,068 22,753 6,423 31,244 Classified - doubtful — — — — Total $ 528,072 $ 3,325,623 $ 1,265,460 $ 5,119,155
Summary of Changes in Accretable Yield for Loans Acquired with Deteriorated Credit Quality	The following table provides changes in accretable yield for loans acquired with deteriorated credit quality: For the Three Months Ended March 31, March 31, (unaudited, in thousands) 2019 2018 Balance at beginning of period $ 6,203 $ 1,724 Acquisitions 1,300 — Reduction due to change in projected cash flows (74 ) (86 ) Reclass from non-accretable difference 831 2,841 Transfers out — — Accretion (968 ) (268 ) Balance at end of period $ 7,292 $ 4,211
Summary of Age Analysis of Loan Categories	The following tables summarize the age analysis of all categories of loans: Age Analysis of Loans (unaudited, in thousands) Current 30-59 Days 60-89 Days 90 Days Total Total Loans 90 Days As of March 31, 2019 Commercial real estate: Land and construction $ 503,148 $ 1,852 $ 127 $ — $ 1,979 $ 505,127 $ — Improved property 3,325,120 5,226 864 6,071 12,161 3,337,281 558 Total commercial real estate 3,828,268 7,078 991 6,071 14,140 3,842,408 558 Commercial and industrial 1,270,957 905 115 3,015 4,035 1,274,992 221 Residential real estate 1,610,652 6,993 2,656 7,766 17,415 1,628,067 1,096 Home equity 583,118 2,970 398 3,976 7,344 590,462 730 Consumer 327,589 1,579 783 201 2,563 330,152 135 Total portfolio loans 7,620,584 19,525 4,943 21,029 45,497 7,666,081 2,740 Loans held for sale 8,358 — — — — 8,358 — Total loans $ 7,628,942 $ 19,525 $ 4,943 $ 21,029 $ 45,497 $ 7,674,439 $ 2,740 Impaired loans included above are as follows: Non-accrual loans $ 9,203 $ 1,234 $ 1,501 $ 18,289 21,024 $ 30,227 TDRs accruing interest (1) 5,181 196 104 — 300 5,481 Total impaired $ 14,384 $ 1,430 $ 1,605 $ 18,289 $ 21,324 $ 35,708 As of December 31, 2018 Commercial real estate: Land and construction $ 526,660 $ 62 $ 1,350 $ — $ 1,412 $ 528,072 $ — Improved property 3,314,765 2,266 2,250 6,342 10,858 3,325,623 175 Total commercial real estate 3,841,425 2,328 3,600 6,342 12,270 3,853,695 175 Commercial and industrial 1,261,536 323 594 3,007 3,924 1,265,460 13 Residential real estate 1,593,519 2,717 5,001 10,370 18,088 1,611,607 2,820 Home equity 591,623 2,500 1,273 3,935 7,708 599,331 705 Consumer 322,584 2,084 1,007 513 3,604 326,188 364 Total portfolio loans 7,610,687 9,952 11,475 24,167 45,594 7,656,281 4,077 Loans held for sale 8,994 — — — — 8,994 — Total loans $ 7,619,681 $ 9,952 $ 11,475 $ 24,167 $ 45,594 $ 7,665,275 $ 4,077 Impaired loans included above are as follows: Non-accrual loans $ 8,910 $ 337 $ 1,370 $ 20,083 21,790 $ 30,700 TDRs accruing interest (1) 5,586 59 92 7 158 5,744 Total impaired $ 14,496 $ 396 $ 1,462 $ 20,090 $ 21,948 $ 36,444 (1) Loans 90 days or more past due and accruing interest exclude TDRs 90
Summary of Impaired Loans	The following tables summarize impaired loans: Impaired Loans March 31, 2019 December 31, 2018 (unaudited, in thousands) Unpaid Principal Balance (1) Recorded Investment Related Allowance Unpaid Principal Balance (1) Recorded Investment Related Allowance With no related specific allowance recorded: Commercial real estate: Land and construction $ 337 $ 285 $ — $ — $ — $ — Improved property 11,521 7,261 — 14,038 9,293 — Commercial and industrial 3,987 3,067 — 4,610 3,428 — Residential real estate 13,460 11,793 — 20,270 18,016 — Home equity 5,337 4,523 — 5,924 5,036 — Consumer 499 362 — 846 671 — Total impaired loans without a specific allowance 35,141 27,291 — 45,688 36,444 — With a specific allowance recorded: Commercial real estate: Land and construction — — — — — — Improved property 2,154 2,133 59 — — — Commercial and industrial 309 307 12 — — — Residential real estate 5,519 5,078 13 — — — Home equity 826 796 7 — — — Consumer 144 103 1 — — — Total impaired loans with a specific allowance 8,952 8,417 92 — — — Total impaired loans $ 44,093 $ 35,708 $ 92 $ 45,688 $ 36,444 $ — (1) The difference between the unpaid principal balance and the recorded investment generally reflects amounts that have been previously charged-off and fair market value adjustments on acquired impaired loans. Impaired Loans For the Three Months Ended March 31, 2019 For the Three Months Ended March 31, 2018 (unaudited, in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized With no related specific allowance recorded: Commercial real estate: Land and construction $ 143 $ — $ 520 $ — Improved property 8,277 — 11,591 345 Commercial and industrial 3,246 — 2,791 2 Residential real estate 13,774 — 18,367 66 Home equity 4,780 — 5,070 5 Consumer 450 — 878 3 Total impaired loans without a specific allowance 30,670 — 39,217 421 With a specific allowance recorded: Commercial real estate: Land and construction — — — — Improved property 1,067 14 2,105 — Commercial and industrial 154 3 — — Residential real estate 2,539 58 — — Home equity 398 8 — — Consumer 52 1 — — Total impaired loans with a specific allowance 4,210 84 2,105 — Total impaired loans $ 34,880 $ 84 $ 41,322 $ 421
Recorded Investment in Non-Accrual Loans and TDRs	The following tables present the recorded investment in non-accrual loans and TDRs: Non-accrual Loans (1) (unaudited, in thousands) March 31, 2019 December 31, 2018 Commercial real estate: Land and construction $ 285 $ — Improved property 8,639 8,413 Total commercial real estate 8,924 8,413 Commercial and industrial 3,212 3,260 Residential real estate 12,871 13,831 Home equity 4,813 4,610 Consumer 407 586 Total $ 30,227 $ 30,700 (1) At March 31, 2019, there was one borrower with a loan greater than $ 1.0 3.3 1.0 3.4 TDRs March 31, 2019 December 31, 2018 (unaudited, in thousands) Accruing Non-Accrual Total Accruing Non-Accrual Total Commercial real estate: Land and construction $ — $ — $ — $ — $ — $ — Improved property 755 1,378 2,133 880 1,529 2,409 Total commercial real estate 755 1,378 2,133 880 1,529 2,409 Commercial and industrial 162 145 307 168 169 337 Residential real estate 4,000 1,078 5,078 4,185 921 5,106 Home equity 506 290 796 426 198 624 Consumer 58 45 103 85 38 123 Total $ 5,481 $ 2,936 $ 8,417 $ 5,744 $ 2,855 $ 8,599
Loans Identified as TDRs	The following tables present details related to loans identified as TDRs during the three months ended March 31, 2019 and 2018, respectively: New TDRs (1) For the Three Months Ended March 31, 2019 March 31, 2018 (unaudited, dollars in thousands) Number of Modifications Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Modifications Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate: Land and construction — $ — $ — — $ — $ — Improved Property — — — — — — Total commercial real estate — — — — — — Commercial and industrial — — — — — — Residential real estate 4 194 192 5 203 195 Home equity 2 187 185 — — — Consumer 2 19 18 2 4 3 Total 8 $ 400 $ 395 7 $ 207 $ 198 (1) Excludes loans that were either paid off or charged-off by period end. The pre-modification balance represents the balance outstanding at the beginning of the period. The post-modification balance represents the outstanding balance at period end. The following table summarizes TDRs which defaulted (defined as past due 90 days) during the three months ended March 31, 2019 and 2018, respectively, that were restructured within the last twelve months prior to March 31, 2019 and 2018, respectively: Defaulted TDRs (1) For the Three Months Ended March 31, 2019 Defaulted TDRs (1) ‎ For the Three Months Ended March 31, 2018 (unaudited, dollars in thousands) Number of Defaults Recorded Investment Number of Defaults Recorded Investment Commercial real estate: Land and construction — $ — — $ — Improved property — — — — Total commercial real estate — — — — Commercial and industrial — — — — Residential real estate 1 58 1 122 Home equity — — 1 7 Consumer — — — — Total 1 $ 58 2 $ 129 (1) Excludes loans that were either charged-off or cured by period end. The recorded investment is as of March 31, 2019 and 2018, respectively.
Summary of Other Real Estate Owned and Repossessed Assets	The following table summarizes other real estate owned and repossessed assets included in other assets: March 31, December 31, (unaudited, in thousands) 2019 2018 Other real estate owned $ 5,915 $ 7,173 Repossessed assets 86 92 Total other real estate owned and repossessed assets $ 6,001 $ 7,265

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Future Minimum Lease Payments Under Non-cancellable Leases	Future minimum lease payments under non-cancellable leases with initial or remaining lease terms in excess of one year at March 31, 2019 are as follows ( unaudited, in thousands Year Amount 2020 912 2021 1,875 2022 2,105 2023 2,875 2024 and thereafter 18,032 Total lease payments $ 25,799 Less: Interest (3,810 ) Present value of lease liabilties $ 21,989

Derivatives and Hedging Activ_2

Derivatives and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Fair Values of Derivative Instruments on Balance Sheets	The table below presents the fair value of WesBanco’s derivative financial instruments as well as their classification on the Balance Sheet as of March 31, 2019 and December 31, 2018: March 31, 2019 December 31, 2018 (unaudited, in thousands) Notional or Contractual Amount Asset Derivatives Liability Derivatives Notional or Contractual Amount Asset Derivatives Liability Derivatives Derivatives Loan Swaps: Interest rate swaps $ 264,628 $ 7,009 $ 7,752 $ 229,778 $ 4,650 $ 5,081 Other contracts: Interest rate loan commitments 30,065 155 — 16,113 125 — Forward TBA contracts 34,500 — 260 20,000 — 234 Total derivatives $ 7,164 $ 8,012 $ 4,775 $ 5,315
Summary of Effect of Derivative Instruments on Income Statement	The table below presents the change in the fair value of the Company’s derivative financial instruments reflected within the other non-interest income line item of the consolidated income statement for the three months ended March 31, 2019 and 2018, respectively. For the Three Months Ended (unaudited, in thousands) Location of Gain/(Loss) 2019 2018 Interest rate swaps Other income $ (312 ) $ 167 Interest rate loan commitments Mortgage banking income 30 136 Forward TBA contracts Mortgage banking income (334 ) 410 Total $ (616 ) $ 713

Pension & Postretirement Medi_2

Pension & Postretirement Medical Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Schedule of Defined Benefit Pension Plan	The following table presents the net periodic pension cost for WesBanco’s Defined Benefit Pension Plan (the “Plan”) and the related components: For the Three Months Ended March 31, (unaudited, in thousands) 2019 2018 Service cost – benefits earned during year $ 554 $ 699 Interest cost on projected benefit obligation 1,298 1,114 Expected return on plan assets (2,187 ) (2,204 ) Amortization of prior service cost 7 6 Amortization of net loss 799 753 Net periodic pension cost $ 471 $ 368

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring and Nonrecurring Basis	The following tables set forth WesBanco’s financial assets and liabilities that were accounted for at fair value on a recurring and nonrecurring basis by level within the fair value hierarchy as of March 31, 2019 and December 31, 2018: March 31, 2019 Fair Value Measurements Using: (unaudited, in thousands) March 31, 2019 Quoted Prices in Active Markets for Identical Assets (level 1) Significant Other Observable Inputs (level 2) Significant Unobservable Inputs (level 3) Recurring fair value measurements Equity securities $ 11,978 $ 11,978 $ — $ — Available-for-sale debt securities U.S. Treasury 19,712 — 19,712 — U.S. Government sponsored entities and agencies 139,290 — 139,290 — Residential mortgage-backed securities and collateralized mortgage obligations of government agencies 1,582,784 — 1,582,784 — Commercial mortgage-backed securities and collateralized mortgage obligations of government sponsored entities and agencies 177,005 — 177,005 — Obligations of state and political subdivisions 186,067 — 184,484 1,583 Corporate debt securities 40,231 — 40,231 — Total available-for-sale $ 2,145,089 $ — $ 2,143,506 $ 1,583 Loans held for sale 8,358 — 8,358 — Other assets—interest rate derivatives agreements 7,009 — 7,009 — Total assets recurring fair value measurements $ 2,172,434 $ 11,978 $ 2,158,873 $ 1,583 Other liabilities—interest rate derivatives agreements $ 7,752 $ — $ 7,752 $ — Total liabilities recurring fair value measurements $ 7,752 $ — $ 7,752 $ — Nonrecurring fair value measurements Other real estate owned and repossessed assets 6,001 — — 6,001 Total nonrecurring fair value measurements $ 6,001 $ — $ — $ 6,001 December 31, 2018 Fair Value Measurements Using: (in thousands) December 31, 2018 Quoted Prices in Active Markets for Identical Assets (level 1) Significant Other Observable Inputs (level 2) Significant Unobservable Inputs (level 3) Recurring fair value measurements Equity securities $ 11,737 $ 11,737 $ — $ — Available-for-sale debt securities U.S. Treasury 19,878 — 19,878 — U.S. Government sponsored entities and agencies 141,652 — 141,652 — Residential mortgage-backed securities and 1,561,255 — 1,561,255 — Commercial mortgage-backed securities and 168,972 — 168,972 — Obligations of state and political subdivisions 185,114 — 183,611 1,503 Corporate debt securities 37,258 — 37,258 — Total available-for-sale debt securities $ 2,114,129 $ — $ 2,112,626 $ 1,503 Loans held for sale 8,994 — 8,994 — Other assets—interest rate derivatives agreements 4,650 — 4,650 — Total assets recurring fair value measurements $ 2,139,510 $ 11,737 $ 2,126,270 $ 1,503 Other liabilities—interest rate derivatives agreements $ 5,081 $ — $ 5,081 $ — Total liabilities recurring fair value measurements $ 5,081 $ — $ 5,081 $ — Nonrecurring fair value measurements Other real estate owned and repossessed assets 7,265 — — 7,265 Total nonrecurring fair value measurements $ 7,265 $ — $ — $ 7,265
Schedule of Assets Measured at Fair Value on Nonrecurring Basis	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which WesBanco has utilized level 3 inputs to determine fair value: Quantitative Information about Level 3 Fair Value Measurements (unaudited, in thousands) Fair Value Estimate Valuation Techniques Unobservable Input Range (Weighted Average) March 31, 2019 Other real estate owned and repossessed assets $ 6,001 Appraisal of collateral (1), (2) December 31, 2018: Other real estate owned and repossessed assets $ 7,265 Appraisal of collateral (1), (2) (1) Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs, which are not identifiable. (2) Includes estimated liquidation expenses and numerous dissimilar qualitative adjustments by management, which are not identifiable.
Estimates Fair Values of Financial Instruments	Fair Value Measurements at March 31, 2019 (unaudited, in thousands) Carrying Amount Fair Value Estimate Quoted Prices in Active Markets for Identical Assets (level 1) Significant Other Observable Inputs (level 2) Significant Unobservable Inputs (level 3) Financial Assets Cash and due from banks $ 336,894 $ 336,894 $ 336,894 $ — $ — Equity securities 11,978 11,978 11,978 — — Available-for- sale d 2,145,089 2,145,089 — 2,143,506 1,583 Held-to-maturity d ebt securities 936,484 948,641 — 948,077 564 Net loans 7,617,215 7,498,726 — — 7,498,726 Loans held for sale 8,358 8,358 — 8,358 — Other assets—interest rate derivatives 7,009 7,009 — 7,009 — Accrued interest receivable 39,662 39,662 39,662 — — Financial Liabilities Deposits 8,916,331 8,919,921 7,492,056 1,427,865 — Federal Home Loan Bank borrowings 1,031,796 1,028,648 — 1,028,648 — Other borrowings 301,547 301,915 298,322 3,593 — Subordinated debt and junior subordinated debt 179,632 166,298 — 166,298 — Other liabilities—interest rate derivatives 7,752 7,752 — 7,752 — Accrued interest payable 6,030 6,030 6,030 — — Fair Value Measurements at December 31, 2018 (in thousands) Carrying Fair Value Quoted Prices in (level 1) Significant Other (level 2) Significant (level 3) Financial Assets Cash and due from banks $ 169,186 $ 169,186 $ 169,186 $ — $ — Equity securities 11,737 11,737 11,737 — — Available-for-sale debt securities 2,114,129 2,114,129 — 2,112,626 1,503 Held-to-maturity debt securities 1,020,934 1,020,743 — 1,020,195 548 Net loans 7,607,333 7,422,825 — — 7,422,825 Loans held for sale 8,994 8,994 — 8,994 — Other assets—interest rate derivatives 4,650 4,650 — 4,650 — Accrued interest receivable 38,853 38,853 38,853 — — Financial Liabilities Deposits 8,831,633 8,836,390 7,376,023 1,460,367 — Federal Home Loan Bank borrowings 1,054,174 1,051,401 — 1,051,401 — Other borrowings 290,522 290,854 288,918 1,936 — Subordinated debt and junior subordinated debt 189,842 174,448 — 174,448 — Other liabilities—interest rate derivatives 5,081 5,081 — 5,081 — Accrued interest payable 4,627 4,627 4,627 — —

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Schedule of Stockholders Equity [Table Text Block]	The activity in shareholders equity for the three months ended March 31, 2019 and 2018 is as follows: WESBANCO, INC. CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY For the Three Months Ended March 31, 2019 and 2018 Accumulated Common Stock Other Deferred (unaudited, in thousands, except Shares Capital Retained Treasury Comprehensive Benefits for shares and per share amounts) Outstanding Amount Surplus Earnings Stock (Loss) Income Directors Total December 31, 2018 54,598,134 $ 113,758 $ 1,166,701 $ 737,581 $ (274 ) $ (37,871 ) $ (1,068 ) $ 1,978,827 Net income — — — 40,337 — — — 40,337 Other comprehensive income — — — — — 19,773 — 19,773 Comprehensive income — — — — — — — 60,110 Common dividends declared — — — (16,916 ) — — — (16,916 ) Treasury shares acquired (7 ) — — — — — — — Stock options exercised 1,000 — (25 ) — 45 — — 20 Stock compensation expense — — 1,075 — — — — 1,075 Deferred benefits for directors - net — — 10 — — — 13 23 March 31, 2019 54,599,127 $ 113,758 $ 1,167,761 $ 761,002 $ (229 ) $ (18,098 ) $ (1,055 ) $ 2,023,139 December 31, 2017 44,043,244 $ 91,756 $ 684,730 $ 651,357 $ — $ (31,495 ) $ (1,027 ) $ 1,395,321 Net income — — — 33,529 — — — 33,529 Other comprehensive loss — — — — — (14,518 ) — (14,518 ) Comprehensive income — — — — — — — 19,011 Common dividends declared — — — (12,775 ) — — — (12,775 ) Adoption of accounting standard — — — 1,063 — (1,063 ) — — Stock options exercised 17,713 37 523 — — — — 560 Stock compensation expense — — 909 — — — — 909 Deferred benefits for directors - net — — 7 — — — (7 ) — March 31, 2018 44,060,957 $ 91,793 $ 686,169 $ 673,174 $ — $ (47,076 ) $ (1,034 ) $ 1,403,026

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2019
Text Block [Abstract]
Summary of Revenue Recognition	The following table summarizes the point of revenue recognition and the income recognized for each of the revenue streams for the three months ended March 31, 2019 and 2018, respectively: For the Three Months Ended Point of Revenue March 31, (unaudited, in thousands) Recognition 2019 2018 Revenue Streams Trust fees Trust account fees Over time $ 5,056 $ 4,292 WesMark fees Over time 2,059 2,211 Total trust fees 7,115 6,503 Service charges on deposits Commercial banking fees Over time 468 407 Personal service charges At a point in time & over time 6,081 4,415 Total service charges on deposits 6,549 4,822 Net securities brokerage revenue Annuity commissions At a point in time 1,362 1,200 Equity and debt security trades At a point in time 102 102 Managed money Over time 157 141 Trail commissions Over time 239 227 Total net securities brokerage revenue 1,860 1,670 Payment processing fees (1) At a point in time & over time 648 — Electronic banking fees At a point in time 5,892 4,829 Mortgage banking income At a point in time 1,056 1,004 Gain/loss on sale of OREO/other assets At a point in time 136 262 (1) Payment processing fees are included in other non-interest income.

Comprehensive Income_(Loss) (Ta

Comprehensive Income/(Loss) (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Components of Accumulated Other Comprehensive Income	The activity in accumulated other comprehensive income for the three months ended March 31, 2019 and 2018 is as follows: Accumulated Other Comprehensive Income/(Loss) (1) (unaudited, in thousands) Defined Unrealized Gains (Losses) on Debt Securities Unrealized Gains Total Balance at December 31, 2018 $ (16,542 ) $ (21,522 ) $ 193 $ (37,871 ) Other comprehensive income before reclassifications — 19,302 — 19,302 Amounts reclassified from accumulated other comprehensive income 543 (33 ) (39 ) 471 Period change 543 19,269 (39 ) 19,773 Balance at March 31, 2019 $ (15,999 ) $ (2,253 ) $ 154 $ (18,098 ) Balance at December 31, 2017 $ (18,626 ) $ (13,250 ) $ 381 $ (31,495 ) Other comprehensive income before reclassifications — (14,905 ) — (14,905 ) Amounts reclassified from accumulated other comprehensive income 437 — (50 ) 387 Period change 437 (14,905 ) (50 ) (14,518 ) Adoption of Accounting Standard ASU 2016-01 — (1,063 ) — (1,063 ) Balance at March 31, 2018 $ (18,189 ) $ (29,218 ) $ 331 $ (47,076 ) (1) All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 23%.
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss)	The following table provides details about amounts reclassified from accumulated other comprehensive income for the three months ended March 31, 2019 and 2018: Details about Accumulated Other Comprehensive Income/(Loss) Components Amounts Reclassified from Affected Line Item in the Statement of Net Income (unaudited, in thousands) 2019 2018 Debt securities available-for-sale (1) Net securities gains reclassified into earnings $ (43 ) $ — Net securities gains (Non-interest income) Related income tax expense 10 — Provision for income taxes Net effect on accumulated other comprehensive income for the period (33 ) — Debt securities held-to-maturity (1) Amortization of unrealized gain transferred from available-for-sale (55 ) (66 ) Interest and dividends on securities (Interest and dividend income) Related income tax expense 16 16 Provision for income taxes Net effect on accumulated other comprehensive income for the period (39 ) (50 ) Defined benefit plans (2) Amortization of net loss and prior service costs 750 756 Employee benefits (Non-interest expense) Related income tax benefit (207 ) (319 ) Provision for income taxes Net effect on accumulated other comprehensive income for the period 543 437 Total reclassifications for the period $ 471 $ 387 (1) For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income, see Note 4, “Securities.” (2) Included in the computation of net periodic pension cost. See Note 8, “Pension & Postretirement Medical Benefit Plans” for additional detail.

Commitments and Contingent Li_2

Commitments and Contingent Liabilities (Tables)	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding	The following table presents total commitments to extend credit, guarantees and various letters of credit outstanding: March 31, December 31, (unaudited, in thousands) 2019 2018 Lines of credit $ 1,919,110 $ 1,894,030 Loans approved but not closed 333,186 258,778 Overdraft limits 153,469 153,572 Letters of credit 43,587 42,841 Contingent obligations and other guarantees 50,159 61,509

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Financial Information by Business Segment	Condensed financial information by business segment is presented below: Trust and Community Investment (unaudited, in thousands) Banking Services Consolidated For the Three Months ended March 31, 2019: Interest and dividend income $ 119,053 $ — $ 119,053 Interest expense 20,692 — 20,692 Net interest income 98,361 — 98,361 Provision for credit losses 2,507 — 2,507 Net interest income after provision for credit losses 95,854 — 95,854 Non-interest income 20,658 7,115 27,773 Non-interest expense 70,275 4,157 74,432 Income before provision for income taxes 46,237 2,958 49,195 Provision for income taxes 8,237 621 8,858 Net income $ 38,000 $ 2,337 $ 40,337 For the Three Months ended March 31, 2018: Interest and dividend income $ 86,417 $ — $ 86,417 Interest expense 13,125 — 13,125 Net interest income 73,292 — 73,292 Provision for credit losses 2,168 — 2,168 Net interest income after provision for credit losses 71,124 — 71,124 Non-interest income 17,477 6,503 23,980 Non-interest expense 50,894 3,677 54,571 Income before provision for income taxes 37,707 2,826 40,533 Provision for income taxes 6,411 593 7,004 Net income $ 31,296 $ 2,233 $ 33,529

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]
Capitalized right of use asset and lease liabilities to be regcognize upon adoption of ASU	$ 20
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

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Aug. 20, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Total Assets		$ 12,601,408	$ 12,458,632
Portfolio loans, net of unearned income		7,666,081	$ 7,656,281
Community Banking [Member]
Business Acquisition [Line Items]
Purchase price allocation in core deposit intangible	$ 37,400
Farmers Capital Bank Corporation [Member]
Business Acquisition [Line Items]
Total Assets	1,600,000
Portfolio loans, net of unearned income	1,000,000
Securities	239,321
Value of acquisition	$ 428,901
Closing stock price	$ 49.40
Number of shares issued for acquisition	7,920,387
Cash consideration for outstanding FFKT shares	$ 37,634
Goodwill acquired	219,418
Purchase price allocation in core deposit intangible	39,992
Merger related expense		$ 3,100
Farmers Capital Bank Corporation [Member] | Trust And Investment Services [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Purchase price allocation in core deposit intangible	$ 2,600

Mergers and Acquisitions - Summ

Mergers and Acquisitions - Summary of Purchase Price of Acquisition and Resulting Goodwill (Detail) - Farmers Capital Bank Corporation [Member] $ in Thousands	Aug. 20, 2018USD ($)
Purchase price:
Fair value of WesBanco shares issued	$ 391,267
Cash consideration for outstanding FFKT shares	37,634
Total purchase price	428,901
Fair value of:
Tangible assets acquired	1,369,186
Core deposit and other intangible assets acquired	39,992
Liabilities assumed	(1,429,834)
Net cash received in the acquisition	230,139
Fair value of net assets acquired	209,483
Goodwill recognized	$ 219,418

Mergers and Acquisitions - Allo

Mergers and Acquisitions - Allocation of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) - Farmers Capital Bank Corporation [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Aug. 20, 2018
Business Acquisition [Line Items]
Cash and due from banks			$ 230,139
Securities			239,321
Loans			1,025,800
Goodwill and other intangible assets			259,410
Accrued income and other assets			104,065
Total assets acquired			1,858,735
Liabilities assumed
Deposits			1,330,328
Borrowings			71,780
Accrued expenses and other liabilities			27,726
Total liabilities assumed			1,429,834
Fair value of net assets acquired			209,483
Net assets acquired			$ 428,901
Purchase Price Allocation Adjustment [Member]
Business Acquisition [Line Items]
Loans	$ 24
Premises and equipment	188
Other real estate owned	(749)
Accrued income and other assets	1,409
Liabilities assumed
Accrued expenses and other liabilities	(50)
Fair value of net assets acquired	822
Increase in goodwill recognized	(822)
Goodwill recognized	$ 219,418	$ 220,240

Earnings Per Common Share - Sum

Earnings Per Common Share - Summary of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Numerator for both basic and diluted earnings per common share:
Net income	$ 40,337	$ 33,529
Denominator:
Total average basic common shares outstanding	54,598,499	44,050,701
Effect of dilutive stock options and other stock compensation	107,838	117,541
Total diluted average common shares outstanding	54,706,337	44,168,242
Earnings per common share—basic	$ 0.74	$ 0.76
Earnings per common share—diluted	$ 0.74	$ 0.76

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan	44,688	39,216
Stock Option [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Securities excluded from computation of net income per diluted shares	117,600
Restricted Stock [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan	17,081	9,000

Securities - Schedule of Fair V

Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	$ 2,148,008	$ 2,142,056
Available-for-sale, Gross Unrealized Gains	15,265	5,861
Available-for-sale, Gross Unrealized Losses	(18,184)	(33,788)
Available-for-sale, Estimated Fair Value	2,145,089	2,114,129
Held-to-maturity, Amortized Cost	936,484	1,020,934
Held-to-maturity, Gross Unrealized Gains	15,445	8,993
Held-to-maturity, Gross Unrealized Losses	(3,288)	(9,184)
Held-to-maturity securities, Fair value	948,641	1,020,743
Total securities, Amortized Cost	3,084,492	3,162,990
Total securities, Gross Unrealized Gains	30,710	14,854
Total securities, Gross Unrealized Losses	(21,472)	(42,972)
Total securities, Estimated Fair Value	3,093,730	3,134,872
US Treasury Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	19,699	19,882
Available-for-sale, Gross Unrealized Gains	13	3
Available-for-sale, Gross Unrealized Losses		(7)
Available-for-sale, Estimated Fair Value	19,712	19,878
U.S. Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	138,380	142,852
Available-for-sale, Gross Unrealized Gains	1,535	556
Available-for-sale, Gross Unrealized Losses	(625)	(1,756)
Available-for-sale, Estimated Fair Value	139,290	141,652
Held-to-maturity, Amortized Cost	10,627	10,823
Held-to-maturity, Gross Unrealized Gains	7	6
Held-to-maturity, Gross Unrealized Losses	(357)	(329)
Held-to-maturity securities, Fair value	10,277	10,500
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	1,590,044	1,585,864
Available-for-sale, Gross Unrealized Gains	8,646	2,912
Available-for-sale, Gross Unrealized Losses	(15,906)	(27,521)
Available-for-sale, Estimated Fair Value	1,582,784	1,561,255
Held-to-maturity, Amortized Cost	142,931	148,300
Held-to-maturity, Gross Unrealized Gains	359	204
Held-to-maturity, Gross Unrealized Losses	(2,258)	(4,170)
Held-to-maturity securities, Fair value	141,032	144,334
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	177,168	171,671
Available-for-sale, Gross Unrealized Gains	1,179	264
Available-for-sale, Gross Unrealized Losses	(1,342)	(2,963)
Available-for-sale, Estimated Fair Value	177,005	168,972
Obligations of State and Political Subdivisions [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	182,603	184,057
Available-for-sale, Gross Unrealized Gains	3,613	2,039
Available-for-sale, Gross Unrealized Losses	(149)	(982)
Available-for-sale, Estimated Fair Value	186,067	185,114
Held-to-maturity, Amortized Cost	749,652	828,520
Held-to-maturity, Gross Unrealized Gains	14,435	8,771
Held-to-maturity, Gross Unrealized Losses	(637)	(4,012)
Held-to-maturity securities, Fair value	763,450	833,279
Corporate Debt Securities [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Available-for-sale, Amortized Cost	40,114	37,730
Available-for-sale, Gross Unrealized Gains	279	87
Available-for-sale, Gross Unrealized Losses	(162)	(559)
Available-for-sale, Estimated Fair Value	40,231	37,258
Held-to-maturity, Amortized Cost	33,274	33,291
Held-to-maturity, Gross Unrealized Gains	644	12
Held-to-maturity, Gross Unrealized Losses	(36)	(673)
Held-to-maturity securities, Fair value	$ 33,882	$ 32,630

Securities - Additional Informa

Securities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)Holdings	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)Holdings
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Maximum percentage of equity of one issuer	10.00%
Number of holdings greater than specified percentage of equity | Holdings	0		0
Securities with aggregate fair values	$ 2,000,000		$ 2,000,000
Proceeds from sale of available-for-sale securities	66,095	$ 0
Net unrealized losses on available-for-sale securities included in AOCI	2,300		21,500
Federal home loan bank stock, Total	50,400		50,800
Equities securities	11,978		$ 11,737
Grantor Trusts [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Equities securities	$ 8,500

Securities - Schedule of Fair_2

Securities - Schedule of Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total available-for-sale securities, One Year or less	$ 32,488
Total available-for-sale securities, One to Five Years	85,418
Total available-for-sale securities, Five to Ten Years	108,445
Total available-for-sale securities, After Ten Years	60,498
Total available-for-sale securities, Mortgage-backed and Equity	1,858,240
Available-for-sale, Estimated Fair Value	2,145,089	$ 2,114,129
Total held-to-maturity securities, One Year or less	9,048
Total held-to-maturity securities, One to Five Years	126,182
Total held-to-maturity securities, Five to Ten Years	378,126
Total held-to-maturity securities, After Ten Years	283,976
Total held-to-maturity securities, Mortgage-backed and Equity	151,309
Held-to-maturity securities, Fair value	948,641	1,020,743
Total, One Year or less	41,536
Total, One to Five Years	211,600
Total, Five to Ten Years	486,571
Total, After Ten Years, Fair value	344,474
Total, Mortgage- backed and Equity	2,009,549
Total, Fair value	3,093,730	3,134,872
US Treasury Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total available-for-sale securities, One Year or less	19,712
Available-for-sale, Estimated Fair Value	19,712	19,878
U.S. Government Sponsored Entities and Agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total available-for-sale securities, One Year or less	496
Total available-for-sale securities, One to Five Years	5,948
Total available-for-sale securities, Five to Ten Years	18,353
Total available-for-sale securities, After Ten Years	16,042
Total available-for-sale securities, Mortgage-backed and Equity	98,451
Available-for-sale, Estimated Fair Value	139,290	141,652
Total held-to-maturity securities, Mortgage-backed and Equity	10,277
Held-to-maturity securities, Fair value	10,277	10,500
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total available-for-sale securities, Mortgage-backed and Equity	1,582,784
Available-for-sale, Estimated Fair Value	1,582,784	1,561,255
Total held-to-maturity securities, One Year or less
Total held-to-maturity securities, Mortgage-backed and Equity	141,032
Held-to-maturity securities, Fair value	141,032	144,334
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total available-for-sale securities, Mortgage-backed and Equity	177,005
Available-for-sale, Estimated Fair Value	177,005	168,972
Obligations of State and Political Subdivisions [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total available-for-sale securities, One Year or less	11,253
Total available-for-sale securities, One to Five Years	47,331
Total available-for-sale securities, Five to Ten Years	83,027
Total available-for-sale securities, After Ten Years	44,456
Available-for-sale, Estimated Fair Value	186,067	185,114
Total held-to-maturity securities, One Year or less	9,048
Total held-to-maturity securities, One to Five Years	117,502
Total held-to-maturity securities, Five to Ten Years	352,924
Total held-to-maturity securities, After Ten Years	283,976
Held-to-maturity securities, Fair value	763,450	833,279
Corporate Debt Securities [Member]
Schedule Of Available For Sale Securities And Held To Maturity [Line Items]
Total available-for-sale securities, One Year or less	1,027
Total available-for-sale securities, One to Five Years	32,139
Total available-for-sale securities, Five to Ten Years	7,065
Total available-for-sale securities, After Ten Years	0
Available-for-sale, Estimated Fair Value	40,231	37,258
Total held-to-maturity securities, One to Five Years	8,680
Total held-to-maturity securities, Five to Ten Years	25,202
Held-to-maturity securities, Fair value	$ 33,882	$ 32,630

Securities - Schedule of Fair_3

Securities - Schedule of Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost and Fair Value Debt Securities [Abstract]
Held-to-maturity, Amortized Cost	$ 936,484	$ 1,020,934

Securities - Schedule of Gross

Securities - Schedule of Gross Realized Gains and Losses on the Sales and Calls of Securities as well as Gains and Losses on Equity Securities as well as Result of the Adoption of the ASU 2016-01 (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Available-for-Sale Securities, Gross Unrealized Gain (Loss) [Line Items]
Net securities gains (losses)	$ 657	$ (39)
Debt Securities [Member]
Available-for-Sale Securities, Gross Unrealized Gain (Loss) [Line Items]
Gross realized gains	242	7
Gross realized losses	(191)	(18)
Net gains (losses) on debt securities	51	(11)
Equity Securities [Member]
Available-for-Sale Securities, Gross Unrealized Gain (Loss) [Line Items]
Net unrealized gains (losses) recognized on securities still held	603	(28)
Net realized gains recognized on securities sold	3
Net gains (losses) on equity securities	$ 606	$ (28)

Securities - Schedule of Unreal

Securities - Schedule of Unrealized Losses on Investment Securities (Detail) $ in Thousands	Mar. 31, 2019USD ($)Security	Dec. 31, 2018USD ($)Security
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 57,450	$ 466,878
Less than 12 months, Unrealized Losses	$ (352)	$ (3,372)
Less than 12 months, Number of Securities | Security	25	284
12 months or more, Fair Value	$ 1,198,310	$ 1,425,284
12 months or more, Unrealized Losses	$ (21,120)	$ (39,600)
12 months or more, Number of Securities | Security	541	837
Fair Value, Total	$ 1,255,760	$ 1,892,162
Unrealized Losses, Total	$ (21,472)	$ (42,972)
Number of Securities Total | Security	566	1,121
US Treasury Securities [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value		$ 9,972
Less than 12 months, Unrealized Losses		$ (7)
Less than 12 months, Number of Securities | Security		1
Fair Value, Total		$ 9,972
Unrealized Losses, Total		$ (7)
Number of Securities Total | Security		1
U.S. Government Sponsored Entities and Agencies [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 758	$ 18,926
Less than 12 months, Unrealized Losses	$ (4)	$ (148)
Less than 12 months, Number of Securities | Security	2	8
12 months or more, Fair Value	$ 62,057	$ 76,385
12 months or more, Unrealized Losses	$ (978)	$ (1,937)
12 months or more, Number of Securities | Security	14	14
Fair Value, Total	$ 62,815	$ 95,311
Unrealized Losses, Total	$ (982)	$ (2,085)
Number of Securities Total | Security	16	22
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 37,601	$ 285,534
Less than 12 months, Unrealized Losses	$ (198)	$ (1,862)
Less than 12 months, Number of Securities | Security	8	44
12 months or more, Fair Value	$ 896,540	$ 922,698
12 months or more, Unrealized Losses	$ (17,966)	$ (29,829)
12 months or more, Number of Securities | Security	286	291
Fair Value, Total	$ 934,141	$ 1,208,232
Unrealized Losses, Total	$ (18,164)	$ (31,691)
Number of Securities Total | Security	294	335
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 8,208	$ 9,186
Less than 12 months, Unrealized Losses	$ (25)	$ (18)
Less than 12 months, Number of Securities | Security	4	6
12 months or more, Fair Value	$ 99,578	$ 111,068
12 months or more, Unrealized Losses	$ (1,317)	$ (2,945)
12 months or more, Number of Securities | Security	12	14
Fair Value, Total	$ 107,786	$ 120,254
Unrealized Losses, Total	$ (1,342)	$ (2,963)
Number of Securities Total | Security	16	20
Obligations of State and Political Subdivisions [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 2,514	$ 104,469
Less than 12 months, Unrealized Losses	$ (7)	$ (439)
Less than 12 months, Number of Securities | Security	7	207
12 months or more, Fair Value	$ 130,249	$ 303,681
12 months or more, Unrealized Losses	$ (779)	$ (4,555)
12 months or more, Number of Securities | Security	224	513
Fair Value, Total	$ 132,763	$ 408,150
Unrealized Losses, Total	$ (786)	$ (4,994)
Number of Securities Total | Security	231	720
Corporate Debt Securities [Member]
Net Unrealized Gains And Losses On Investments [Line Items]
Less than 12 months, Fair Value	$ 8,369	$ 38,791
Less than 12 months, Unrealized Losses	$ (118)	$ (898)
Less than 12 months, Number of Securities | Security	4	18
12 months or more, Fair Value	$ 9,886	$ 11,452
12 months or more, Unrealized Losses	$ (80)	$ (334)
12 months or more, Number of Securities | Security	5	5
Fair Value, Total	$ 18,255	$ 50,243
Unrealized Losses, Total	$ (198)	$ (1,232)
Number of Securities Total | Security	9	23

Loans and the Allowance for C_3

Loans and the Allowance for Credit Losses - Additional Information (Detail)	Aug. 20, 2018USD ($)	Mar. 31, 2019USD ($)Contract	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)Contract
Financing Receivable, Recorded Investment [Line Items]
Net Deferred loan (costs) and fees		$ 4,200,000	$ 3,200,000	$ 3,200,000
Unamortized discount on purchased loans from acquisitions		44,800,000	49,300,000	49,300,000
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard		20,100,000	22,900,000	22,900,000
Internally assigned loan grades to residential real estate, home equity and consumer loans		2,000,000	3,900,000	3,900,000
Loans acquired with deteriorated credit quality		$ 10,943,000	9,741,000	$ 9,741,000
Number of restructured contracts greater than $0 million | Contract		0		0
Accruing and non accrual TDR permitted interest-only payment period		3 months
Other real estate owned		$ 5,915,000	7,173,000	$ 7,173,000
Threshold for TDR		1,000,000	1,000,000	1,000,000
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans acquired with deteriorated credit quality		875,000	900,000	900,000
Commercial and Industrial [Member] | Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Annual sales of borrowers				100
Cost Recovery Method [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans acquired with deteriorated credit quality, fair value	$ 2,400,000
Farmers Capital Bank Corporation [Member]
Financing Receivable, Recorded Investment [Line Items]
Unamortized discount on purchased loans from acquisitions		21,000,000
Loans acquired with deteriorated credit quality	5,300,000	3,200,000
Fair value of acquired loans	1,025,800,000
Unfunded commitments to debtors for impaired loans		100,000	100,000	100,000
Portfolio loans, net of unearned income	1,064,800,000
Fair market value adjustment of acquired loans	988,300,000
Fair market value adjustment of acquired loans	26,000,000
Loans acquired with deteriorated credit quality, fair value	$ 4,600,000
Acquired loans, sold book value			45,200,000
Acquired loans, sold			32,900,000
Loans acquired with deteriorated credit quality outstanding customer balance		3,800,000
Acquired impaired loans allowances for loan losses		0	0	0
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans acquired with deteriorated credit quality		1,820,000	2,430,000	2,430,000
Other real estate owned		1,600,000	1,300,000	1,300,000
Foreclosure proceedings in process on residential real estate loans		$ 4,400,000	$ 6,000,000	$ 6,000,000

Loans and the Allowance for C_4

Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	$ 7,666,081	$ 7,656,281
Loans held for sale	8,358	8,994
Total loans	7,674,439	7,665,275
Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	505,127	528,072
Commercial Real Estate - Improved Property [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	3,337,281	3,325,623
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	1,274,992	1,265,460
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	3,842,408	3,853,695
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	1,628,067	1,611,607
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	330,152	326,188
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total portfolio loans	$ 590,462	$ 599,331

Loans and the Allowance for C_5

Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	$ 48,948	$ 45,284
Allowance for loan commitments, beginning balance	741	574
Total beginning allowance for credit losses	49,689	45,858
Provision for loan losses	1,288	2,113
Provision for loan commitments	1,219	55
Total provision for credit losses	2,507	2,168
Charge-offs	(2,636)	(2,643)
Recoveries	1,266	1,580
Net charge-offs	(1,370)	(1,063)
Allowance for loan losses, ending balance	48,866	46,334
Allowance for loan commitments, ending balance	1,960	629
Total ending allowance for credit losses	50,826	46,963
Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	4,039	3,117
Allowance for loan commitments, beginning balance	169	119
Total beginning allowance for credit losses	4,208	3,236
Provision for loan losses	(6)	1,090
Provision for loan commitments	25	57
Total provision for credit losses	19	1,147
Recoveries	12	117
Net charge-offs	12	117
Allowance for loan losses, ending balance	4,045	4,324
Allowance for loan commitments, ending balance	194	176
Total ending allowance for credit losses	4,239	4,500
Commercial Real Estate - Improved Property [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	20,848	21,166
Allowance for loan commitments, beginning balance	33	26
Total beginning allowance for credit losses	20,881	21,192
Provision for loan losses	(909)	(895)
Provision for loan commitments	(9)	(5)
Total provision for credit losses	(918)	(900)
Charge-offs	(222)	(279)
Recoveries	198	287
Net charge-offs	(24)	8
Allowance for loan losses, ending balance	19,915	20,279
Allowance for loan commitments, ending balance	24	21
Total ending allowance for credit losses	19,939	20,300
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	12,114	9,414
Allowance for loan commitments, beginning balance	262	173
Total beginning allowance for credit losses	12,376	9,587
Provision for loan losses	1,050	919
Provision for loan commitments	1,181	3
Total provision for credit losses	2,231	922
Charge-offs	(635)	(109)
Recoveries	378	270
Net charge-offs	(257)	161
Allowance for loan losses, ending balance	12,907	10,494
Allowance for loan commitments, ending balance	1,443	176
Total ending allowance for credit losses	14,350	10,670
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	972	821
Total beginning allowance for credit losses	972	821
Provision for loan losses	575	(48)
Total provision for credit losses	575	(48)
Charge-offs	(441)	(267)
Recoveries	99	109
Net charge-offs	(342)	(158)
Allowance for loan losses, ending balance	1,205	615
Total ending allowance for credit losses	1,205	615
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	3,822	3,206
Allowance for loan commitments, beginning balance	12	7
Total beginning allowance for credit losses	3,834	3,213
Provision for loan losses	122	202
Provision for loan commitments	(1)
Total provision for credit losses	121	202
Charge-offs	(320)	(287)
Recoveries	121	131
Net charge-offs	(199)	(156)
Allowance for loan losses, ending balance	3,745	3,252
Allowance for loan commitments, ending balance	11	7
Total ending allowance for credit losses	3,756	3,259
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	2,797	3,063
Allowance for loan commitments, beginning balance	39	37
Total beginning allowance for credit losses	2,836	3,100
Provision for loan losses	233	583
Provision for loan commitments	1	4
Total provision for credit losses	234	587
Charge-offs	(661)	(1,125)
Recoveries	411	546
Net charge-offs	(250)	(579)
Allowance for loan losses, ending balance	2,780	3,067
Allowance for loan commitments, ending balance	40	41
Total ending allowance for credit losses	2,820	3,108
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	4,356	4,497
Allowance for loan commitments, beginning balance	226	212
Total beginning allowance for credit losses	4,582	4,709
Provision for loan losses	223	262
Provision for loan commitments	22	(4)
Total provision for credit losses	245	258
Charge-offs	(357)	(576)
Recoveries	47	120
Net charge-offs	(310)	(456)
Allowance for loan losses, ending balance	4,269	4,303
Allowance for loan commitments, ending balance	248	208
Total ending allowance for credit losses	$ 4,517	$ 4,511

Loans and the Allowance for C_6

Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	$ 92
Allowance for loans collectively evaluated for impairment	48,774	$ 48,948
Allowance for loan commitments	1,960	741	$ 629	$ 574
Total allowance for credit losses	50,826	49,689	46,963	45,858
Individually evaluated for impairment	8,417
Collectively evaluated for impairment	7,646,721	7,646,540
Acquired with deteriorated credit quality	10,943	9,741
Total loans	7,666,081	7,656,281
Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	4,045	4,039
Allowance for loan commitments	194	169	176	119
Total allowance for credit losses	4,239	4,208	4,500	3,236
Collectively evaluated for impairment	504,885	527,737
Acquired with deteriorated credit quality	242	335
Total loans	505,127	528,072
Commercial Real Estate - Improved Property [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	59
Allowance for loans collectively evaluated for impairment	19,856	20,848
Allowance for loan commitments	24	33	21	26
Total allowance for credit losses	19,939	20,881	20,300	21,192
Individually evaluated for impairment	2,133
Collectively evaluated for impairment	3,327,142	3,319,672
Acquired with deteriorated credit quality	8,006	5,951
Total loans	3,337,281	3,325,623
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	12
Allowance for loans collectively evaluated for impairment	12,895	12,114
Allowance for loan commitments	1,443	262	176	173
Total allowance for credit losses	14,350	12,376	10,670	9,587
Individually evaluated for impairment	307
Collectively evaluated for impairment	1,273,810	1,264,560
Acquired with deteriorated credit quality	875	900
Total loans	1,274,992	1,265,460
Deposit Overdraft [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans collectively evaluated for impairment	1,205	972
Total allowance for credit losses	1,205	972	615	821
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	13
Allowance for loans collectively evaluated for impairment	3,732	3,822
Allowance for loan commitments	11	12	7	7
Total allowance for credit losses	3,756	3,834	3,259	3,213
Individually evaluated for impairment	5,078
Collectively evaluated for impairment	1,621,169	1,609,177
Acquired with deteriorated credit quality	1,820	2,430
Total loans	1,628,067	1,611,607
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	1
Allowance for loans collectively evaluated for impairment	2,779	2,797
Allowance for loan commitments	40	39	41	37
Total allowance for credit losses	2,820	2,836	3,108	3,100
Individually evaluated for impairment	103
Collectively evaluated for impairment	330,049	326,063
Acquired with deteriorated credit quality		125
Total loans	330,152	326,188
Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loans individually evaluated for impairment	7
Allowance for loans collectively evaluated for impairment	4,262	4,356
Allowance for loan commitments	248	226	208	212
Total allowance for credit losses	4,517	4,582	$ 4,511	$ 4,709
Individually evaluated for impairment	796
Collectively evaluated for impairment	589,666	599,331
Total loans	$ 590,462	$ 599,331

Loans and the Allowance for C_7

Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investments in Loans (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Troubled debt restructuring threshold	$ 1	$ 1

Loans and the Allowance for C_8

Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Summary of commercial loans by risk grade
Commercial loans	$ 7,617,215	$ 7,607,333
Pass [Member]
Summary of commercial loans by risk grade
Commercial loans	5,008,297	5,036,201
Criticized [Member]
Summary of commercial loans by risk grade
Commercial loans	69,691	51,710
Classified—substandard [Member]
Summary of commercial loans by risk grade
Commercial loans	39,412	31,244
Commercial Real Estate - Land and Construction [Member]
Summary of commercial loans by risk grade
Commercial loans	505,127	528,072
Commercial Real Estate - Land and Construction [Member] | Pass [Member]
Summary of commercial loans by risk grade
Commercial loans	497,566	523,707
Commercial Real Estate - Land and Construction [Member] | Criticized [Member]
Summary of commercial loans by risk grade
Commercial loans	5,599	2,297
Commercial Real Estate - Land and Construction [Member] | Classified—substandard [Member]
Summary of commercial loans by risk grade
Commercial loans	1,962	2,068
Commercial Real Estate - Improved Property [Member]
Summary of commercial loans by risk grade
Commercial loans	3,337,281	3,325,623
Commercial Real Estate - Improved Property [Member] | Pass [Member]
Summary of commercial loans by risk grade
Commercial loans	3,269,034	3,267,304
Commercial Real Estate - Improved Property [Member] | Criticized [Member]
Summary of commercial loans by risk grade
Commercial loans	47,464	35,566
Commercial Real Estate - Improved Property [Member] | Classified—substandard [Member]
Summary of commercial loans by risk grade
Commercial loans	20,783	22,753
Commercial and Industrial [Member]
Summary of commercial loans by risk grade
Commercial loans	1,274,992	1,265,460
Commercial and Industrial [Member] | Pass [Member]
Summary of commercial loans by risk grade
Commercial loans	1,241,697	1,245,190
Commercial and Industrial [Member] | Criticized [Member]
Summary of commercial loans by risk grade
Commercial loans	16,628	13,847
Commercial and Industrial [Member] | Classified—substandard [Member]
Summary of commercial loans by risk grade
Commercial loans	16,667	6,423
Commercial Portfolio Segment [Member]
Summary of commercial loans by risk grade
Commercial loans	$ 5,117,400	$ 5,119,155

Loans and the Allowance for C_9

Loans and the Allowance for Credit Losses - Summary of Changes in Accretable Yield for Loans Acquired with Deteriorated Credit Quality (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract]
Balance at beginning of period	$ 6,203	$ 1,724
Acquisitions	1,300
Reduction due to change in projected cash flows	(74)	(86)
Reclass from non-accretable difference	831	2,841
Transfers out
Accretion	(968)	(268)
Balance at end of period	$ 7,292	$ 4,211

Loans and the Allowance for _10

Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Current	$ 7,620,584	$ 7,610,687
Total Past Due	45,497	45,594
Total loans	7,666,081	7,656,281
Loans held for sale	8,358	8,994
90 Days or More Past Due and Accruing	2,740	4,077
Loans held for sale, current	8,358	8,994
Total loans, current	7,628,942	7,619,681
Total loans	7,674,439	7,665,275
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	583,118	591,623
Total Past Due	7,344	7,708
Total loans	590,462	599,331
90 Days or More Past Due and Accruing	730	705
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	3,828,268	3,841,425
Total Past Due	14,140	12,270
Total loans	3,842,408	3,853,695
90 Days or More Past Due and Accruing	558	175
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	1,610,652	1,593,519
Total Past Due	17,415	18,088
Total loans	1,628,067	1,611,607
90 Days or More Past Due and Accruing	1,096	2,820
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	327,589	322,584
Total Past Due	2,563	3,604
Total loans	330,152	326,188
90 Days or More Past Due and Accruing	135	364
Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	503,148	526,660
Total Past Due	1,979	1,412
Total loans	505,127	528,072
Commercial Real Estate - Improved Property [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	3,325,120	3,314,765
Total Past Due	12,161	10,858
Total loans	3,337,281	3,325,623
90 Days or More Past Due and Accruing	558	175
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	1,270,957	1,261,536
Total Past Due	4,035	3,924
Total loans	1,274,992	1,265,460
90 Days or More Past Due and Accruing	221	13
Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	9,203	8,910
Total Past Due	21,024	21,790
Total loans	30,227	30,700
TDRs Accruing Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	5,181	5,586
Total Past Due	300	158
Total loans	5,481	5,744
Total Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Current	14,384	14,496
Total Past Due	21,324	21,948
Total loans	35,708	36,444
30-59 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	19,525	9,952
30-59 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	2,970	2,500
30-59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	7,078	2,328
30-59 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	6,993	2,717
30-59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,579	2,084
30-59 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,852	62
30-59 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	5,226	2,266
30-59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	905	323
30-59 Days Past Due [Member] | Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,234	337
30-59 Days Past Due [Member] | TDRs Accruing Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	196	59
30-59 Days Past Due [Member] | Total Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,430	396
60-89 Days Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	4,943	11,475
60-89 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	398	1,273
60-89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	991	3,600
60-89 Days Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	2,656	5,001
60-89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	783	1,007
60-89 Days Past Due [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	127	1,350
60-89 Days Past Due [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	864	2,250
60-89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	115	594
60-89 Days Past Due [Member] | Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,501	1,370
60-89 Days Past Due [Member] | TDRs Accruing Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	104	92
60-89 Days Past Due [Member] | Total Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	1,605	1,462
90 Days or More Past Due [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	21,029	24,167
90 Days or More Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	3,976	3,935
90 Days or More Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	6,071	6,342
90 Days or More Past Due [Member] | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	7,766	10,370
90 Days or More Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	201	513
90 Days or More Past Due [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	6,071	6,342
90 Days or More Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	3,015	3,007
90 Days or More Past Due [Member] | Non-Accrual Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	18,289	20,083
90 Days or More Past Due [Member] | TDRs Accruing Interest [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due		7
90 Days or More Past Due [Member] | Total Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Past Due	$ 18,289	$ 20,090

Loans and the Allowance for _11

Loans and the Allowance for Credit Losses - Summary of Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	$ 35,141		$ 45,688
Total impaired loans, Unpaid principal balance	44,093		45,688
Recorded Investment, With no specific allowance recorded	27,291		36,444
Total impaired loans, Recorded investment	35,708		36,444
Unpaid Principal Balance, With a specific allowance recorded	8,952
Recorded Investment, With a specific allowance recorded	8,417
Related Allowance, With no specific allowance recorded
Related Allowance, With a specific allowance recorded	92
Total impaired loans, Related Allowance	92
Average recorded investment, with no related specific allowance	30,670	$ 39,217
Interest income recognized, With no related specific allowance		421
Average recorded investment, With a specific allowance recorded	4,210	2,105
Interest income recognized, With a specific allowance recorded	84
Total impaired loans, Average recorded investment	34,880	41,322
Total impaired loans, Interest income recognized	84	421
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	13,460		20,270
Recorded Investment, With no specific allowance recorded	11,793		18,016
Unpaid Principal Balance, With a specific allowance recorded	5,519
Recorded Investment, With a specific allowance recorded	5,078
Related Allowance, With no specific allowance recorded
Related Allowance, With a specific allowance recorded	13
Average recorded investment, with no related specific allowance	13,774	18,367
Interest income recognized, With no related specific allowance		66
Average recorded investment, With a specific allowance recorded	2,539
Interest income recognized, With a specific allowance recorded	58
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	499		846
Recorded Investment, With no specific allowance recorded	362		671
Unpaid Principal Balance, With a specific allowance recorded	144
Recorded Investment, With a specific allowance recorded	103
Related Allowance, With no specific allowance recorded
Related Allowance, With a specific allowance recorded	1
Average recorded investment, with no related specific allowance	450	878
Interest income recognized, With no related specific allowance		3
Average recorded investment, With a specific allowance recorded	52
Interest income recognized, With a specific allowance recorded	1
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	5,337		5,924
Recorded Investment, With no specific allowance recorded	4,523		5,036
Unpaid Principal Balance, With a specific allowance recorded	826
Recorded Investment, With a specific allowance recorded	796
Related Allowance, With no specific allowance recorded
Related Allowance, With a specific allowance recorded	7
Average recorded investment, with no related specific allowance	4,780	5,070
Interest income recognized, With no related specific allowance		5
Average recorded investment, With a specific allowance recorded	398
Interest income recognized, With a specific allowance recorded	8
Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	337
Recorded Investment, With no specific allowance recorded	285
Unpaid Principal Balance, With a specific allowance recorded
Recorded Investment, With a specific allowance recorded
Related Allowance, With no specific allowance recorded
Related Allowance, With a specific allowance recorded
Average recorded investment, with no related specific allowance	143	520
Interest income recognized, With no related specific allowance
Average recorded investment, With a specific allowance recorded
Interest income recognized, With a specific allowance recorded
Commercial Real Estate - Improved Property [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	11,521		14,038
Recorded Investment, With no specific allowance recorded	7,261		9,293
Unpaid Principal Balance, With a specific allowance recorded	2,154
Recorded Investment, With a specific allowance recorded	2,133
Related Allowance, With no specific allowance recorded
Related Allowance, With a specific allowance recorded	59
Average recorded investment, with no related specific allowance	8,277	11,591
Interest income recognized, With no related specific allowance		345
Average recorded investment, With a specific allowance recorded	1,067	2,105
Interest income recognized, With a specific allowance recorded	14
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance, With no specific allowance recorded	3,987		4,610
Recorded Investment, With no specific allowance recorded	3,067		$ 3,428
Unpaid Principal Balance, With a specific allowance recorded	309
Recorded Investment, With a specific allowance recorded	307
Related Allowance, With no specific allowance recorded
Related Allowance, With a specific allowance recorded	12
Average recorded investment, with no related specific allowance	3,246	2,791
Interest income recognized, With no related specific allowance		$ 2
Average recorded investment, With a specific allowance recorded	154
Interest income recognized, With a specific allowance recorded	$ 3

Loans and the Allowance for _12

Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Non-accrual loans	$ 30,227	$ 30,700
TDRs	8,417	8,599
Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	5,481	5,744
Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	2,936	2,855
Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	285
Commercial Real Estate - Improved Property [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	8,639	8,413
TDRs	2,133	2,409
Commercial Real Estate - Improved Property [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	755	880
Commercial Real Estate - Improved Property [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	1,378	1,529
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	3,212	3,260
TDRs	307	337
Commercial and Industrial [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	162	168
Commercial and Industrial [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	145	169
Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	4,813	4,610
TDRs	796	624
Home Equity [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	506	426
Home Equity [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	290	198
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	8,924	8,413
TDRs	2,133	2,409
Commercial Real Estate [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	755	880
Commercial Real Estate [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	1,378	1,529
Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	12,871	13,831
TDRs	5,078	5,106
Residential Real Estate [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	4,000	4,185
Residential Real Estate [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	1,078	921
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Non-accrual loans	407	586
TDRs	103	123
Consumer [Member] | Accruing TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	58	85
Consumer [Member] | Non-Accrual TDRs [Member]
Financing Receivable, Impaired [Line Items]
TDRs	$ 45	$ 38

Loans and the Allowance for _13

Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Parenthetical) (Detail)	Mar. 31, 2019USD ($)Borrowers	Dec. 31, 2018USD ($)Borrowers
Receivables [Abstract]
Number of borrowers with loans greater than one million | Borrowers	1	1
Borrowers with large amount of loans outstanding, minimum amount of loans per borrower	$ 1,000,000	$ 1,000,000
Borrowers with large amount of loans outstanding, net	$ 3,300,000	$ 3,400,000

Loans and the Allowance for _14

Loans and the Allowance for Credit Losses - Loans Identified as TDRs (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)Contract	Mar. 31, 2018USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	8	7
Pre-Modification Outstanding Recorded Investment	$ 400	$ 207
Post-Modification Outstanding Recorded Investment	$ 395	$ 198
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	4	5
Pre-Modification Outstanding Recorded Investment	$ 194	$ 203
Post-Modification Outstanding Recorded Investment	$ 192	$ 195
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	2	2
Pre-Modification Outstanding Recorded Investment	$ 19	$ 4
Post-Modification Outstanding Recorded Investment	$ 18	$ 3
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	2
Pre-Modification Outstanding Recorded Investment	$ 187
Post-Modification Outstanding Recorded Investment	$ 185

Loans and the Allowance for _15

Loans and the Allowance for Credit Losses - TDRs Defaulted Later Restructured (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)Defaults	Mar. 31, 2018USD ($)Defaults
Financing Receivable, Modifications [Line Items]
Number of Defaults | Defaults	1	2
Recorded Investment | $	$ 58	$ 129
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults | Defaults	1	1
Recorded Investment | $	$ 58	$ 122
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults | Defaults		1
Recorded Investment | $		$ 7

Loans and the Allowance for _16

Loans and the Allowance for Credit Losses - Summary of Other Real Estate Owned and Repossessed Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Other real estate owned	$ 5,915	$ 7,173
Repossessed assets	86	92
Total other real estate owned and repossessed assets	$ 6,001	$ 7,265

Leases - Additional Information

Leases - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Weighted-average lease term	9 years
Operating lease ROU assets	$ 19,000
Operating lease ROU liabilities	21,989
Operating lease, expense	$ 600
Weighted average discount rate	3.28%
Maximum [Member]
Operating lease terms	21 years
Operating lease term extensions	10 years
Minimum [Member]
Operating lease terms	1 year
Operating lease term extensions	5 years

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments Under Non-cancellable Leases (Detail) $ in Thousands	Mar. 31, 2019USD ($)
Leases [Abstract]
2020	$ 912
2021	1,875
2022	2,105
2023	2,875
2024 and thereafter	18,032
Total lease payments	25,799
Less: Interest	(3,810)
Present value of lease liabilties	$ 21,989

Derivatives and Hedging Activ_3

Derivatives and Hedging Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019USD ($)Derivative	Mar. 31, 2018USD ($)Derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Aggregate notional amount	$ 264,600,000	$ 229,800,000
Net gain (loss) on change in fair value	(616,000)	$ 713,000
Collateral posted with market value on liability positions with credit risk-related contingent features	$ 11,800,000
Interest Rate Swaps [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate swaps | Derivative	46	43
Net gain (loss) on change in fair value	$ (300,000)	$ 200,000
Income (loss) on derivative instrument not designated hedges	$ 700,000	$ 400,000

Derivatives and Hedging Activ_4

Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	$ 264,600,000		$ 229,800,000
Asset Derivatives	7,164,000	$ 4,775,000
Liability Derivatives	8,012,000	5,315,000
Interest Rate Swaps [Member] | Loan Swaps [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	264,628,000	229,778,000
Asset Derivatives	7,009,000	4,650,000
Liability Derivatives	7,752,000	5,081,000
Interest Rate Loan Commitments [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	30,065,000	16,113,000
Asset Derivatives	155,000	125,000
Forward TBA Contracts [Member] | Other Contract [Member]
Derivatives, Fair Value [Line Items]
Notional or Contractual Amount	34,500,000	20,000,000
Liability Derivatives	$ 260,000	$ 234,000

Derivatives and Hedging Activ_5

Derivatives and Hedging Activities - Summary of Effect of Derivative Instruments on Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivatives, Fair Value [Line Items]
Total gain (loss) on derivative financial instruments	$ (616)	$ 713
Interest Rate Swaps [Member] | Other Income [Member]
Derivatives, Fair Value [Line Items]
Total gain (loss) on derivative financial instruments	(312)	167
Interest Rate Loan Commitments [Member] | Mortgage Banking Income [Member]
Derivatives, Fair Value [Line Items]
Total gain (loss) on derivative financial instruments	30	136
Forward TBA Contracts [Member] | Mortgage Banking Income [Member]
Derivatives, Fair Value [Line Items]
Total gain (loss) on derivative financial instruments	$ (334)	$ 410

Pension & Postretirement Medi_3

Pension & Postretirement Medical Benefit Plans - Defined Benefit Pension Plan (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost - benefits earned during year	$ 554	$ 699
Interest cost on projected benefit obligation	1,298	1,114
Expected return on plan assets	(2,187)	(2,204)
Amortization of prior service cost	7	6
Amortization of net loss	799	753
Net periodic pension cost	$ 471	$ 368

Pension & Postretirement Medi_4

Pension & Postretirement Medical Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Aug. 20, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum required pension plan contribution	$ 4,800
Available credit balance	52,500
Expected voluntary contribution for the year 2019	3,000
Net periodic interest cost	1,298	$ 1,114
Prior service cost	7	6
Net periodic cost post retirement medical benefit plan	471	$ 368
Postemployment Retirement Benefits [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net periodic interest cost	113
Prior service cost	55
Net periodic cost post retirement medical benefit plan	58
Farmers Capital Bank Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Postretirement medical benefit plan			$ 15,000
Defined benefit plan, Unrealized gain	$ 5,500
Life of the plan	17 years

Fair Value Measurement - Schedu

Fair Value Measurement - Schedule of Fair Value of Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 11,978	$ 11,737
Available-for-sale debt securities	2,145,089	2,114,129
Loans held for sale	8,358	8,994
Other real estate owned and repossessed assets	6,001	7,265
Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets—interest rate derivatives agreements	7,752	5,081
Equity securities	11,978	11,737
Total liabilities recurring fair value measurements	7,752	5,081
Available-for-sale debt securities	2,145,089	2,114,129
Loans held for sale	8,358	8,994
Other assets - interest rate derivatives agreements	7,009	4,650
Total assets recurring fair value measurements	2,172,434	2,139,510
Nonrecurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned and repossessed assets	6,001	7,265
Total assets recurring fair value measurements	6,001	7,265
US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	19,712	19,878
US Treasury Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	19,712	19,878
U.S. Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	139,290	141,652
U.S. Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	139,290	141,652
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	1,582,784	1,561,255
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	1,582,784	1,561,255
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	177,005	168,972
Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	177,005	168,972
Obligations of State and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	186,067	185,114
Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	186,067	185,114
Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	40,231	37,258
Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	40,231	37,258
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	11,978	11,737
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	11,978	11,737
Total assets recurring fair value measurements	11,978	11,737
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets—interest rate derivatives agreements	7,752	5,081
Available-for-sale debt securities	2,143,506	2,112,626
Loans held for sale	8,358	8,994
Other assets - interest rate derivatives agreements	7,009	4,650
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets—interest rate derivatives agreements	7,752	5,081
Total liabilities recurring fair value measurements	7,752	5,081
Available-for-sale debt securities	2,143,506	2,112,626
Loans held for sale	8,358	8,994
Other assets - interest rate derivatives agreements	7,009	4,650
Total assets recurring fair value measurements	2,158,873	2,126,270
Significant Other Observable Inputs (Level 2) [Member] | US Treasury Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	19,712	19,878
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	139,290	141,652
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	1,582,784	1,561,255
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	177,005	168,972
Significant Other Observable Inputs (Level 2) [Member] | Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	184,484	183,611
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	40,231	37,258
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	1,583	1,503
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	1,583	1,503
Total assets recurring fair value measurements	1,583	1,503
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned and repossessed assets	6,001	7,265
Total assets recurring fair value measurements	6,001	7,265
Significant Unobservable Inputs (Level 3) [Member] | Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	$ 1,583	$ 1,503

Fair Value Measurement - Additi

Fair Value Measurement - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair value transfer amount	$ 0	$ 0

Fair Value Measurement - Sche_2

Fair Value Measurement - Schedule of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value Inputs Asset Quantitative Information [Line Items]
Other real estate owned and repossessed assets	$ 6,001	$ 7,265
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Other real estate owned and repossessed assets	6,001	7,265
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs Asset Quantitative Information [Line Items]
Other real estate owned and repossessed assets	$ 6,001	$ 7,265

Fair Value Measurement - Estima

Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financial Assets
Cash and due from banks	$ 336,894	$ 169,186
Equity securities	11,978	11,737
Available-for-sale debt securities	2,145,089	2,114,129
Held-to-maturity debt securities	936,484	1,020,934
Net loans	7,617,215	7,607,333
Loans held for sale	8,358	8,994
Accrued interest receivable	39,662	38,853
Financial Liabilities
Deposits	8,916,331	8,831,633
Federal Home Loan Bank borrowings	1,031,796	1,054,174
Other borrowings	301,547	290,522
Subordinated debt and junior subordinated debt	179,632	189,842
Accrued interest payable	6,030	4,627
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets
Cash and due from banks	336,894	169,186
Equity securities	11,978	11,737
Accrued interest receivable	39,662	38,853
Financial Liabilities
Deposits	7,492,056	7,376,023
Other borrowings	298,322	288,918
Accrued interest payable	6,030	4,627
Significant Other Observable Inputs (Level 2) [Member]
Financial Assets
Available-for-sale debt securities	2,143,506	2,112,626
Held-to-maturity debt securities	948,077	1,020,195
Loans held for sale	8,358	8,994
Other assets-interest rate derivatives	7,009	4,650
Financial Liabilities
Deposits	1,427,865	1,460,367
Federal Home Loan Bank borrowings	1,028,648	1,051,401
Other borrowings	3,593	1,936
Subordinated debt and junior subordinated debt	166,298	174,448
Other liabilities-interest rate derivatives	7,752	5,081
Significant Unobservable Inputs (Level 3) [Member]
Financial Assets
Available-for-sale debt securities	1,583	1,503
Held-to-maturity debt securities	564	548
Net loans	7,498,726	7,422,825
Carrying Amount [Member]
Financial Assets
Cash and due from banks	336,894	169,186
Equity securities	11,978	11,737
Available-for-sale debt securities	2,145,089	2,114,129
Held-to-maturity debt securities	936,484	1,020,934
Net loans	7,617,215	7,607,333
Loans held for sale	8,358	8,994
Other assets-interest rate derivatives	7,009	4,650
Accrued interest receivable	39,662	38,853
Financial Liabilities
Deposits	8,916,331	8,831,633
Federal Home Loan Bank borrowings	1,031,796	1,054,174
Other borrowings	301,547	290,522
Subordinated debt and junior subordinated debt	179,632	189,842
Other liabilities-interest rate derivatives	7,752	5,081
Accrued interest payable	6,030	4,627
Fair Value Estimate [Member]
Financial Assets
Cash and due from banks	336,894	169,186
Equity securities	11,978	11,737
Available-for-sale debt securities	2,145,089	2,114,129
Held-to-maturity debt securities	948,641	1,020,743
Net loans	7,498,726	7,422,825
Loans held for sale	8,358	8,994
Other assets-interest rate derivatives	7,009	4,650
Accrued interest receivable	39,662	38,853
Financial Liabilities
Deposits	8,919,921	8,836,390
Federal Home Loan Bank borrowings	1,028,648	1,051,401
Other borrowings	301,915	290,854
Subordinated debt and junior subordinated debt	166,298	174,448
Other liabilities-interest rate derivatives	7,752	5,081
Accrued interest payable	$ 6,030	$ 4,627

Shareholders' Equity - Summary

Shareholders' Equity - Summary of activity in shareholders equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Beginning Balance	$ 1,978,827	$ 1,395,321
Net income	40,337	33,529
Other comprehensive income (loss)	19,773	(14,518)
Comprehensive income	60,110	19,011
Common dividends declared ($0.29 per share)	(16,916)	(12,775)
Stock options exercised	20	560
Stock compensation expense	1,075	909
Deferred benefits for directors - net	23
Ending Balance	2,023,139	1,403,026
Common Stock [Member]
Beginning Balance	$ 113,758	$ 91,756
Beginning Balance, shares	54,598,134	44,043,244
Treasury shares acquired, shares	(7)
Stock options exercised		$ 37
Stock options exercised, shares	1,000	17,713
Ending Balance	$ 113,758	$ 91,793
Ending Balance, shares	54,599,127	44,060,957
Capital Surplus [Member]
Beginning Balance	$ 1,166,701	$ 684,730
Stock options exercised	(25)	523
Stock compensation expense	1,075	909
Deferred benefits for directors - net	10	7
Ending Balance	1,167,761	686,169
Retained Earnings [Member]
Beginning Balance	737,581	651,357
Net income	40,337	33,529
Common dividends declared ($0.29 per share)	(16,916)	(12,775)
Adoption of accounting standard ASU 2016-01		1,063
Ending Balance	761,002	673,174
Treasury Stock [Member]
Beginning Balance	(274)
Stock options exercised	45
Ending Balance	(229)
Accumulated Other Comprehensive (Loss) Income [Member]
Beginning Balance	(37,871)	(31,495)
Other comprehensive income (loss)	19,773	(14,518)
Adoption of accounting standard ASU 2016-01		(1,063)
Ending Balance	(18,098)	(47,076)
Deferred Benefits for Directors [Member]
Beginning Balance	(1,068)	(1,027)
Deferred benefits for directors - net	13	(7)
Ending Balance	$ (1,055)	$ (1,034)

Revenue Recognition - Summary o

Revenue Recognition - Summary of Revenue Recognition (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 1,860	$ 1,670
Electronic banking fees	5,892	4,829
Mortgage banking income	1,056	1,004
Gain/loss on sale of OREO/other assets	136	262
Total Service Charges on Deposits [Member]
Schedule of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	6,549	4,822
Trust Account fees [Member]
Schedule of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 5,056	$ 4,292
Point of revenue recognition	Over time	Over time
WesMark Fees [Member]
Schedule of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 2,059	$ 2,211
Point of revenue recognition	Over time	Over time
Total Trust Fees [Member]
Schedule of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 7,115	$ 6,503
Commercial Banking Fees [Member]
Schedule of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 468	$ 407
Point of revenue recognition	Over time	Over time
Personal Service Charges [Member]
Schedule of Revenue Recognition [Line Items]
Total trust fees/Total service charges on deposits	$ 6,081	$ 4,415
Point of revenue recognition	At a point in time & over time	At a point in time & Over time
Annuity Commissions [Member]
Schedule of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 1,362	$ 1,200
Point of revenue recognition	At a point in time	At a point in time
Equity And Debt Security Trades [Member]
Schedule of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 102	$ 102
Point of revenue recognition	At a point in time	At a point in time
Managed Money [Member]
Schedule of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 157	$ 141
Point of revenue recognition	Over time	Over time
Trail Commissions [Member]
Schedule of Revenue Recognition [Line Items]
Total net securities brokerage revenue	$ 239	$ 227
Point of revenue recognition	Over time	Over time
Payment Processing Fees [Member]
Schedule of Revenue Recognition [Line Items]
Payment Processing Fees	$ 648
Point of revenue recognition	At a point in time & over time
Electronic Banking Fees [Member]
Schedule of Revenue Recognition [Line Items]
Point of revenue recognition	At a point in time	At a point in time
Mortgage [Member]
Schedule of Revenue Recognition [Line Items]
Point of revenue recognition	At a point in time	At a point in time
OREO/other assets [Member]
Schedule of Revenue Recognition [Line Items]
Point of revenue recognition	At a point in time	At a point in time

Comprehensive Income_(Loss) - C

Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 1,978,827	$ 1,395,321
Amounts reclassified from accumulated other comprehensive income/(loss)	(471)	(387)
Total other comprehensive (loss) gain	19,773	(14,518)
Ending Balance	2,023,139	1,403,026
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(16,542)	(18,626)
Other comprehensive income/(loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive income/(loss)	543	437
Total other comprehensive (loss) gain	543	437
Ending Balance	(15,999)	(18,189)
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(21,522)	(13,250)
Other comprehensive income/(loss) before reclassifications	19,302	(14,905)
Amounts reclassified from accumulated other comprehensive income/(loss)	33
Total other comprehensive (loss) gain	19,269	(14,905)
Adoption of Accounting Standard ASU 2016-01		(1,063)
Ending Balance	(2,253)	(29,218)
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	193	381
Other comprehensive income/(loss) before reclassifications	0
Amounts reclassified from accumulated other comprehensive income/(loss)	39	(50)
Total other comprehensive (loss) gain	(39)	(50)
Ending Balance	154	331
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(37,871)	(31,495)
Other comprehensive income/(loss) before reclassifications	19,302	(14,905)
Amounts reclassified from accumulated other comprehensive income/(loss)	471	387
Total other comprehensive (loss) gain	19,773	(14,518)
Adoption of Accounting Standard ASU 2016-01		(1,063)
Ending Balance	$ (18,098)	$ (47,076)

Comprehensive Income_(Loss) -_2

Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Detail) (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Percentage of Federal and State income tax rate	23.00%	23.00%

Comprehensive Income_(Loss) - S

Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	$ (657)	$ 39
Interest and dividends on securities (Interest and dividend income)	(22,274)	(16,377)
Employee benefits (Non-interest expense)	9,989	6,912
Provision for income taxes	8,858	7,004
Net effect on accumulated other comprehensive income/(loss) for the period	471	387
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net effect on accumulated other comprehensive income/(loss) for the period	(33)
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net effect on accumulated other comprehensive income/(loss) for the period	(39)	50
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net effect on accumulated other comprehensive income/(loss) for the period	(543)	(437)
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	(43)
Provision for income taxes	10
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and dividends on securities (Interest and dividend income)	(55)	(66)
Provision for income taxes	16	16
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Employee benefits (Non-interest expense)	750	756
Provision for income taxes	$ (207)	$ (319)

Commitments and Contingent Li_3

Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Allowance for credit losses associated with loan commitments	$ 1,960	$ 741	$ 629	$ 574
Liability associated with letters of credit	$ 200	$ 200

Commitments and Contingent Li_4

Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Lines of credit	$ 1,919,110	$ 1,894,030
Loans approved but not closed	333,186	258,778
Overdraft limits	153,469	153,572
Letters of credit	43,587	42,841
Contingent obligations and other guarantees	$ 50,159	$ 61,509

Business Segments - Additional

Business Segments - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)Segment	Mar. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Operating segments | Segment	2
Trust and Investment Services [Member]
Segment Reporting Information [Line Items]
Market value of assets managed or held in custody by trust and investment services segment	$ 4,500	$ 4,000
Total non-fiduciary assets of the trust and investment services segment	4.1	$ 1.8
Trust and Investment Services [Member] | Customer-Related Intangible Assets [Member]
Segment Reporting Information [Line Items]
Total non-fiduciary assets of the trust and investment services segment	$ 2.4

Business Segments - Financial I

Business Segments - Financial Information by Business Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Interest and dividend income	$ 119,053	$ 86,417
Interest expense	20,692	13,125
Net interest income	98,361	73,292
Provision for credit losses	2,507	2,168
Net interest income after provision for credit losses	95,854	71,124
Non-interest income	27,773	23,980
Non-interest expense	74,432	54,571
Income before provision for income taxes	49,195	40,533
Provision for income taxes	8,858	7,004
Net income	40,337	33,529
Community Banking [Member]
Segment Reporting Information [Line Items]
Interest and dividend income	119,053	86,417
Interest expense	20,692	13,125
Net interest income	98,361	73,292
Provision for credit losses	2,507	2,168
Net interest income after provision for credit losses	95,854	71,124
Non-interest income	20,658	17,477
Non-interest expense	70,275	50,894
Income before provision for income taxes	46,237	37,707
Provision for income taxes	8,237	6,411
Net income	38,000	31,296
Trust and Investment Services [Member]
Segment Reporting Information [Line Items]
Non-interest income	7,115	6,503
Non-interest expense	4,157	3,677
Income before provision for income taxes	2,958	2,826
Provision for income taxes	621	593
Net income	$ 2,337	$ 2,233