Components of Net Periodic Benefit Cost - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 1,212	$ 1,199
Interest cost	3,100	2,790
Expected return on plan assets	(8,119)	(7,479)
Amortization of Prior service cost	0	0
Amortization of Net loss (gain)	512	0
Net periodic (income) benefit cost	(3,295)	(3,490)
Pension Plan | Acquired RSI Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0
Interest cost	0	76
Expected return on plan assets	0	(122)
Amortization of Net loss (gain)	0	0
Net periodic (income) benefit cost	0	(46)
RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	61	69
Interest cost	162	158
Expected return on plan assets	0	0
Amortization of Prior service cost	0	0
Amortization of Net loss (gain)	28	14
Net periodic (income) benefit cost	251	241
Post-retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	54	54
Interest cost	248	242
Expected return on plan assets	0	0
Amortization of Prior service cost	0	0
Amortization of Net loss (gain)	0	0
Net periodic (income) benefit cost	302	296
Post-retirement Plan | Acquired RSI Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	13	17
Interest cost	31	27
Expected return on plan assets	0	0
Amortization of Net loss (gain)	(5)	(15)
Net periodic (income) benefit cost	39	29
Split-Dollar Life Insurance
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	57	69
Interest cost	208	204
Expected return on plan assets	0	0
Amortization of Prior service cost	14	14
Amortization of Net loss (gain)	0	0
Net periodic (income) benefit cost	$ 279	$ 287