Qualified Employee Benefit Plans - The Retirement Plan's Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in projected benefit obligation:
Projected benefit obligation at end of year	$ 68,600
Change in plan assets:
Plan assets at fair value at end of year	63,300
Retirement Plan
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	98,426	$ 100,480
Interest cost	5,025	5,199	$ 3,958
Plan settlements	(39,246)	0
Actuarial loss (gain)	7,655	(984)
Benefits paid	(3,281)	(6,269)
Projected benefit obligation at end of year	68,579	98,426	100,480
Change in plan assets:
Plan assets at fair value at beginning of year	101,376	95,990
Actual return on plan assets	4,476	11,655
Plan settlements	(39,246)	0
Benefits paid	(3,281)	(6,269)
Plan assets at fair value at end of year	63,325	101,376	$ 95,990
Funded status	$ (5,254)	$ 2,950