Employee Benefit Plans - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pension Benefits
Components of net periodic benefit cost
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	819	496	2,456	1,489
Expected return on plan assets	(1,198)	(1,471)	(3,592)	(4,414)
Amortization of net retirement plan actuarial loss	289	304	867	913
Amortization of net retirement plan prior service (credit) cost	0	0	0	0
Net periodic benefit (income) cost	(90)	(671)	(269)	(2,012)
Life and Health
Components of net periodic benefit cost
Service cost	8	43	24	130
Interest cost	89	56	266	167
Expected return on plan assets	0	0	0	0
Amortization of net retirement plan actuarial loss	(10)	49	(30)	147
Amortization of net retirement plan prior service (credit) cost	(16)	(15)	(46)	(46)
Net periodic benefit (income) cost	71	133	214	398
SERP Benefits
Components of net periodic benefit cost
Service cost	11	19	32	58
Interest cost	287	203	861	610
Expected return on plan assets	0	0	0	0
Amortization of net retirement plan actuarial loss	0	212	0	635
Amortization of net retirement plan prior service (credit) cost	69	69	208	208
Net periodic benefit (income) cost	$ 367	$ 503	$ 1,101	$ 1,511