Pension Plans - Net Periodic Benefit Cost (Credit) (Details) - Pension Plan [Member] - Qualified Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost	$ 526	$ 472
Expected return on plan assets	(1,031)	(1,019)
Amortization of net actuarial loss	200	289
Total net periodic pension income	$ (305)	$ (258)