Employee Benefit Plans (Combined Activity in Corporations Defined Benefit Pension Plans) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Benefits [Abstract]
Fair value of plan assets at beginning of year	$ 174,611	$ 161,823	$ 197,747
Actual return on plan assets	5,306	22,477	(26,108)
Employer contributions	1,150	1,105	1,114
Benefits paid	(11,340)	(10,794)	(10,930)
Fair value of plan assets at end of year	169,727	174,611	161,823
Benefit obligation at beginning of year	142,372	143,944	185,925
Interest cost	6,647	6,983	4,017
Actuarial (gain) loss	(6,779)	2,239	(35,068)
Benefits paid	(11,340)	(10,794)	(10,930)
Benefit obligation at end of year	130,900	142,372	143,944
Funded status of the plan at end of year and accrued benefit (liability) recognized	38,827	32,239	17,879
Accumulated benefit obligation at end of year	$ 130,900	$ 142,372	$ 143,944