Employee Benefits - Narrative (Detail) $ in Thousands		1 Months Ended	12 Months Ended
	Nov. 29, 2021 shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2021 USD ($) plan h shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Nov. 01, 2020	Oct. 31, 2020	Dec. 31, 2018 USD ($)
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined benefit plan, age requirement			21 years
Defined benefit plan, service requirement			1 year
Defined benefit plan, service requirement for full vesting for individuals employed on or before October 21, 1989			3 years
Defined benefit plan, service requirement for full vesting for individuals employed subsequent to October 31, 1989			5 years
Defined benefit plan, service requirement for full vesting for individuals who were not already in the defined benefit plan as of November 1, 2020			3 years
Defined benefit plan, expected future employer contributions, current fiscal year		$ 7,200	$ 7,200
Discretionary employer contribution to the Defined Benefit Plan				$ 32,500
Discretionary contributions for the Defined Contribution Plan			4,600	$ 4,400	$ 4,200
Amount borrowed under ESOP		$ 149,400	$ 149,400
Shares purchased under ESOP (in shares) | shares		14,940,652	14,940,652	14,940,652
ESOP loan term			30 years
ESOP compensation expense			$ 9,400	$ 2,400
ESOP compensation expense related to releases and allocation				900
ESOP compensation expense related to accrued loan payments				1,500
ESOP upfront principal payment				$ 1,000
Allocated shares (in shares) | shares		63,690	63,690	63,690
Loan payments from ESOP			$ 7,900
Principal payments from ESOP			3,000
Interest payments from ESOP			$ 4,900
Shares committed to be allocated during the year | shares			501,444
Shares committed to be allocated (in shares) | shares		605,908	605,908	104,464
Defined contribution liability		$ 33,400	$ 33,400	$ 27,600
Number of deferred compensation plans | plan			3
Deferred compensation plans, liabilities		$ 31,500	$ 31,500	28,900
Share-based compensation arrangement by share-based payment award, reduction of shares available to be issued upon exercise of stock options with each additional restricted stock grant | shares	3
Share-based payment arrangement, noncash expense			9,408	2,351	0
2021 Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) | shares	26,146,141
Share-based payment arrangement, noncash expense			200
Share-based payment arrangement, expense, tax benefit (less than)			$ 100
2021 Plan | Restricted Stock Units (RSUs)
Defined Benefit Plan, Plan Assets, Category [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) | shares	7,470,326
Share-based compensation arrangement by share-based payment award, award vesting period	5 years
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) | shares		6,787,270	6,787,270
Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period (in shares) | shares		0
Share-based payment arrangement, nonvested award, excluding option, cost not yet recognized, amount		$ 13,500	$ 13,500
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition			4 years 10 months 24 days
2021 Plan | Share-based Payment Arrangement, Option
Defined Benefit Plan, Plan Assets, Category [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares) | shares	18,675,815
Share-based compensation arrangement by share-based payment award, expiration period	10 years
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares) | shares		18,675,815	18,675,815
Share-based compensation arrangement by share-based payment award, options, grants in period, gross (in shares) | shares		0
Annual amount from 2022 through 2049
Defined Benefit Plan, Plan Assets, Category [Line Items]
Shares committed to be allocated (in shares) | shares		501,426	501,426
Annual amount for 2050
Defined Benefit Plan, Plan Assets, Category [Line Items]
Shares committed to be allocated (in shares) | shares		231,124	231,124
Asset Management Arrangement
Defined Benefit Plan, Plan Assets, Category [Line Items]
Actuarial (gain) loss			$ (50,878)	(48,895)
Benefit obligation		$ 546,056	546,056	449,643	378,879
Equity Securities
Defined Benefit Plan, Plan Assets, Category [Line Items]
Rabbi trust investments		91,700	91,700	78,700
Fair value, net asset (liability)		$ 58,100	$ 58,100	$ 53,900
Fixed income | Minimum
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan asset, target allocation percentages		24.00%	24.00%
Fixed income | Maximum
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan asset, target allocation percentages		38.00%	38.00%
Hedge Funds | Minimum
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan asset, target allocation percentages		9.00%	9.00%
Hedge Funds | Maximum
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan asset, target allocation percentages		21.00%	21.00%
Defined Benefit Plan, Equity Securities | Minimum
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan asset, target allocation percentages		47.00%	47.00%
Defined Benefit Plan, Equity Securities | Maximum
Defined Benefit Plan, Plan Assets, Category [Line Items]
Plan asset, target allocation percentages		61.00%	61.00%
Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Contribution credits rate		3.50%	3.50%	3.50%
Actuarial (gain) loss			$ (1,697)	$ 78,095	74,828
Benefit obligation		$ 501,507	501,507	361,147	396,769			$ 302,317
Supplemental Employee Retirement Plan | DC SERP
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined contribution expense			$ 900	$ 900	$ 1,300
Qualified Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Defined benefit plan, minimum working hours for eligibility | h			1,000
Defined benefit plan, treasury rate, term			30 years
Contribution credits rate							3.50%
Defined benefit plan, normal retirement age			65 years
Nonqualified Plan | Pension Plan
Defined Benefit Plan, Plan Assets, Category [Line Items]
Contribution credits rate						5.00%