Comprehensive Income/(Loss) (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Components of Accumulated Other Comprehensive Income

The activity in accumulated other comprehensive income for the years ended December 31, 2020, 2019 and 2018 is as follows:

	Accumulated Other Comprehensive Income/(Loss) (1)
(in thousands)	Defined Benefit Plans			Unrealized Gains (Losses) on Debt Securities Available-for- Sale			Unrealized Gains on Debt Securities Transferred from Available-for- Sale to Held-to- Maturity			Total
Balance at December 31, 2019	$	(17,468	)	$	18,644		$	25		$	1,201
Other comprehensive income/(loss) before    reclassifications		(320	)		30,153			—			29,833
Amounts reclassified from accumulated other    comprehensive income/(loss)		2,286			(1,936	)		(25	)		325
Period change		1,966			28,217			(25	)		30,158
Balance at December 31, 2020	$	(15,502	)	$	46,861		$	—		$	31,359
Balance at December 31, 2018	$	(16,542	)	$	(21,522	)	$	193		$	(37,871	)
Other comprehensive income/(loss) before    reclassifications		(3,239	)		40,341			—			37,102
Amounts reclassified from accumulated other    comprehensive income/(loss)		2,313			(175	)		(168	)		1,970
Period change		(926	)		40,166			(168	)		39,072
Balance at December 31, 2019	$	(17,468	)	$	18,644		$	25		$	1,201
Balance at December 31, 2017	$	(18,626	)	$	(13,250	)	$	381		$	(31,495	)
Other comprehensive income/(loss) before    reclassifications		(4,277	)		(7,220	)		—			(11,497	)
Acquired FFKT post-retirement medical benefit plan		4,235			—			—			4,235
Amounts reclassified from accumulated other    comprehensive income/(loss)		2,126			11			(188	)		1,949
Period change		2,084			(7,209	)		(188	)		(5,313	)
Adoption of ASU 2016-01 (2)		—			(1,063	)		—			(1,063	)
Balance at December 31, 2018	$	(16,542	)	$	(21,522	)	$	193		$	(37,871	)

(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% in all periods presented.

(2) See Note 4, “Securities”, for additional information about Wesbanco’s adoption of ASU 2016-01.

Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss)

Details about Accumulated Other Comprehensive Income/(Loss) Components	Amounts Reclassified from Accumulated Other Comprehensive Income/ (Loss) For the Years Ended December 31,									Affected Line Item in the Statement of Net Income
(in thousands)	2020			2019			2018
Securities available-for-sale (1):
Net securities (gains) losses reclassified into    earnings	$	(2,540	)	$	(227	)	$	15		Net securities gains (Non-interest income)
Related income tax expense (benefit)		604			52			(4	)	Provision for income taxes
Net effect on accumulated other comprehensive    income/(loss) for the period		(1,936	)		(175	)		11
Securities held-to-maturity (1):
Amortization of unrealized gain transferred    from available-for-sale		(32	)		(222	)		(244	)	Interest and dividends on securities (Interest and    dividend income)
Related income tax expense		7			54			56		Provision for income taxes
Net effect on accumulated other comprehensive    income/(loss) for the period		(25	)		(168	)		(188	)
Defined benefit plans (2):
Amortization of net loss and prior service    costs		3,000			3,042			2,948		Employee benefits (Non-interest expense)
Related income tax benefit		(714	)		(729	)		(822	)	Provision for income taxes
Net effect on accumulated other comprehensive    income/(loss) for the period		2,286			2,313			2,126
Total reclassifications for the period	$	325		$	1,970		$	1,949

(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 13, “Employee Benefit Plans” for additional detail.