Components of Net Periodic Benefit Cost - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1,039	$ 1,146	$ 3,464	$ 3,544
Interest cost	3,292	3,028	9,492	8,609
Expected return on plan assets	(8,231)	(7,905)	(24,470)	(22,865)
Prior service cost	0	0	0	0
Net (gain)	130	398	1,153	397
Net periodic (income) benefit cost	(3,770)	(3,333)	(10,361)	(10,315)
Pension Plan | Acquired RSI Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0	0	0
Interest cost	0	76	0	229
Expected return on plan assets	0	(121)	0	(365)
Net (gain)	0	0	0	0
Net periodic (income) benefit cost	0	(45)	0	(136)
RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	61	69	183	207
Interest cost	162	158	486	474
Expected return on plan assets	0	0	0	0
Prior service cost	0	0	0	0
Net (gain)	28	14	84	42
Net periodic (income) benefit cost	251	241	753	723
Post-retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	54	54	162	161
Interest cost	248	242	744	727
Expected return on plan assets	0	0	0	0
Prior service cost	0	0	0	0
Net (gain)	0	0	0	0
Net periodic (income) benefit cost	302	296	906	888
Post-retirement Plan | Acquired RSI Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	13	17	39	51
Interest cost	31	26	93	80
Expected return on plan assets	0	0	0	0
Net (gain)	(5)	(15)	(16)	(46)
Net periodic (income) benefit cost	39	28	116	85
Split-Dollar Life Insurance
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	57	69	171	208
Interest cost	208	204	624	613
Expected return on plan assets	0	0	0	0
Prior service cost	14	14	42	42
Net (gain)	0	0	0	0
Net periodic (income) benefit cost	$ 279	$ 287	$ 837	$ 863