Income Taxes (Tables)

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Reconciliation of Income Tax Expense Attributable to Income from Operations with Amounts Computed by Applying U.S. Federal Tax Rate to Pretax Income from Continuing Operations

	For the Three Months Ended March 31,
	2021							2020
(in thousands)	Amount			%				Amount			%
Provision for income taxes at the statutory rate of 21%	$	18,865			21.0		%	$	(16,666	)		21.0		%
Increase (reduction) in taxes resulting from:
Excess tax benefit on share-based compensation		(1,924	)		(2.1	)	%		(1,029	)		1.3		%
Tax exempt interest income		(319	)		(0.4	)	%		(313	)		0.4		%
Dividends received deduction		(236	)		(0.3	)	%		(271	)		0.3		%
Investment tax credit		(801	)		(0.9	)	%		(1,321	)		1.7		%
ESOP dividends paid deduction		(130	)		(0.1	)	%		(132	)		0.2		%
Nondeductible expenses		411			0.5		%		203			(0.3	)	%
Other items, net		956			1.0		%		1,432			(1.8	)	%
Total tax expense (benefit)	$	16,822			18.7		%	$	(18,097	)		22.8		%