Employee Benefit Plans (Combined Activity in Corporations Defined Benefit Pension Plans) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
Fair value of plan assets at beginning of year	$ 169,727	$ 174,611	$ 161,823
Actual return on plan assets	14,677	5,306	22,477
Employer contributions	1,151	1,150	1,105
Benefits paid	(11,348)	(11,340)	(10,794)
Fair value of plan assets at end of year	174,207	169,727	174,611
Benefit obligation at beginning of year	130,900	142,372	143,944
Interest cost	6,619	6,647	6,983
Actuarial (gain) loss	3,645	(6,779)	2,239
Benefits paid	(11,348)	(11,340)	(10,794)
Benefit obligation at end of year	129,816	130,900	142,372
Funded status of the plan at end of year and accrued benefit (liability) recognized	44,391	38,827	32,239
Accumulated benefit obligation at end of year	$ 129,816	$ 130,900	$ 142,372