Pension Plans - Net Periodic Benefit Cost (Credit) (Details) - Pension Plan [Member] - Qualified Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	$ 825	$ 540	$ 1,650	$ 1,066
Expected return on plan assets	(729)	(1,031)	(1,459)	(2,062)
Amortization of net actuarial loss	228	223	456	423
Net settlement loss		853		853
Total net periodic pension expense	$ 324	$ 585	$ 647	$ 280