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Employee Benefits - Retirement Plan, Based on Measurement Date (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in Plan Assets:
Fair value of assets at end of year	$ 261,030
Pension Benefits
Change in Benefit Obligation:
Benefit obligation at beginning of year	159,896	$ 143,235
Interest cost	4,692	5,660	$ 5,085
Actuarial loss (gain)	14,629	18,806
Annuity payments	(6,510)	(6,473)
Settlements	(575)	(1,332)
Benefit obligation at end of year	172,132	159,896	143,235
Change in Plan Assets:
Fair value of assets at beginning of year	242,558	210,246
Actual return (loss) on plan assets	25,557	40,117
Annuity payments	(6,510)	(6,473)
Settlements	(575)	(1,332)
Fair value of assets at end of year	261,030	242,558	$ 210,246
Funded status (included in “Other assets”)	88,898	82,662
Changes recognized in other comprehensive income for the year ended December 31:
Amortization of actuarial loss	(7,327)	(10,035)
Net actuarial (gain) loss arising during the year	4,577	(7,378)
Total recognized in other comprehensive income for the year (pre-tax)	(2,750)	(17,413)
Accumulated other comprehensive loss (pre-tax) not yet recognized in net periodic benefit cost at December 31:
Actuarial loss, net	73,017	75,767
Total accumulated other comprehensive loss (pre-tax)	$ 73,017	$ 75,767

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