Components of Net Periodic Benefit Cost (Tables)

9 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Net periodic (income) benefit cost for the Pension Plan, RIM Plan, Post-retirement Plan and Split-Dollar Life Insurance plan benefits for the three and nine months ended September 30, 2023 and 2022, includes the following components:

	For the Three Months Ended September 30,
	Pension Plan				RIM Plan				Post-retirement Plan				Split-Dollar Life Insurance
	2023		2022		2023		2022		2023		2022		2023		2022		Affected Line Item in the Consolidated Statements of Income
	(In thousands)
Service cost	$	1,146	$	1,267	$	69	$	93	$	54	$	87	$	69	$	130	Compensation and employee benefits
Interest cost	3,028		2,724		158		97		242		150		204		158		Other non-interest expense
Expected return on plan assets	(7,905)		(7,072)		—		—		—		—		—		—		Other non-interest expense
Amortization:
Prior service cost	—		—		—		—		—		—		14		14		Other non-interest expense
Net loss	398		660		14		111		—		78		—		151		Other non-interest expense
Net periodic (income) benefit cost	$	(3,333)	$	(2,421)	$	241	$	301	$	296	$	315	$	287	$	453

	For the Nine Months Ended September 30,
	Pension Plan				RIM Plan				Post-retirement Plan				Split-Dollar Life Insurance
	2023		2022		2023		2022		2023		2022		2023		2022		Affected Line Item in the Consolidated Statements of Income
	(In thousands)
Service cost	$	3,544	$	5,199	$	207	$	279	$	161	$	261	$	208	$	383	Compensation and employee benefits
Interest cost	8,609		6,786		474		291		727		450		613		453		Other non-interest expense
Expected return on plan assets	(22,865)		(22,190)		—		—		—		—		—		—		Other non-interest expense
Amortization:
Prior service cost	—		—		—		—		—		—		42		42		Other non-interest expense
Net loss	397		660		42		333		—		234		—		453		Other non-interest expense
Net periodic (income) benefit cost	$	(10,315)	$	(9,545)	$	723	$	903	$	888	$	945	$	863	$	1,331

Net periodic (income) benefit cost for the Pension Plan and Post-retirement Plan for the three and nine months ended September 30, 2023 and 2022, includes the following components:

	For the Three Months Ended September 30,
	Pension Plan				Post-retirement Plan				Affected Line Item in the Consolidated Statements of Income
	2023		2022		2023		2022
	(In thousands)
Service cost	$	—	$	—	$	17	$	35	Compensation and employee benefits
Interest cost	76		75		26		35		Other non-interest expense
Expected return on plan assets	(121)		(111)		—		—		Other non-interest expense
Amortization:
Prior service cost	—		—		(15)		—		Other non-interest expense
Net periodic (income) benefit cost	$	(45)	$	(36)	$	28	$	70

	For the Nine Months Ended September 30,
	Pension Plan				Post-retirement Plan				Affected Line Item in the Consolidated Statements of Income
	2023		2022		2023		2022
	(In thousands)
Service cost	$	—	$	—	$	51	$	58	Compensation and employee benefits
Interest cost	229		125		80		58		Other non-interest expense
Expected return on plan assets	(365)		(185)		—		—		Other non-interest expense
Amortization:
Net (gain)	—		—		(46)		—		Other non-interest expense
Net periodic (income) benefit cost	$	(136)	$	(60)	$	85	$	116