Income Taxes (Tables)

9 Months Ended

Sep. 30, 2020

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 September 30,														For the Nine Months Ended September 30,
	2020							2019							2020							2019
(in thousands)	Amount			%				Amount			%				Amount			%				Amount			%
Provision for income taxes at the statutory rate of 21%	$	10,817			21.0		%	$	8,179			21.0		%	$	18,275			21.0		%	$	35,598			21.0		%
Increase (reduction) in taxes resulting from:
Excess tax benefit on share-based compensation		(848	)		(1.6	)	%		(614	)		(1.6	)	%		(2,141	)		(2.4	)	%		(3,546	)		(2.1	)	%
Tax exempt interest income		(324	)		(0.6	)	%		(276	)		(0.7	)	%		(960	)		(1.1	)	%		(930	)		(0.6	)	%
Dividends received deduction		(221	)		(0.4	)	%		(218	)		(0.6	)	%		(705	)		(0.8	)	%		(635	)		(0.4	)	%
Investment tax credit		(316	)		(0.6	)	%		—			0.0		%		(1,766	)		(2.0	)	%		—			0.0		%
ESOP dividends paid deduction		(134	)		(0.3	)	%		(136	)		(0.3	)	%		(403	)		(0.5	)	%		(413	)		(0.2	)	%
Nondeductible expenses		275			0.5		%		243			0.6		%		639			0.7		%		1,166			0.7		%
Other items, net		(127	)		(0.3	)	%		(555	)		(1.4	)	%		799			0.9		%		12			0.0		%
Total tax expense	$	9,122			17.7		%	$	6,623			17.0		%	$	13,738			15.8		%	$	31,252			18.4		%