Components of Net Periodic Benefit Costs (Tables)

9 Months Ended

Sep. 30, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Net periodic benefit (income) 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, 2022 and 2021, includes the following components:

	For the Three Months Ended September 30,
	Pension Plan				RIM Plan				Post-retirement Plan				Split-Dollar Life Insurance
	2022		2021		2022		2021		2022		2021		2022		2021		Affected Line Item in the Consolidated Statements of Income
	(In thousands)
Service cost	$	1,267	$	1,872	$	93	$	100	$	122	$	130	$	130	$	141	Compensation and employee benefits
Interest cost	2,799		1,902		97		86		185		141		158		125		Other non-interest expense
Expected return on plan assets	(7,183)		(6,661)		—		—		—		—		—		—		Other non-interest expense
Amortization:
Prior service cost	—		—		—		—		—		—		14		14		Other non-interest expense
Net loss	660		—		111		166		78		153		151		191		Other non-interest expense
Net periodic (income) benefit cost	$	(2,457)	$	(2,887)	$	301	$	352	$	385	$	424	$	453	$	471

	For the Nine Months Ended September 30,
	Pension Plan				RIM Plan				Post-retirement Plan				Split-Dollar Life Insurance
	2022		2021		2022		2021		2022		2021		2022		2021		Affected Line Item in the Consolidated Statements of Income
	(In thousands)
Service cost	$	5,199	$	6,172	$	279	$	300	$	319	$	390	$	383	$	423	Compensation and employee benefits
Interest cost	6,911		5,414		291		258		508		423		453		375		Other non-interest expense
Expected return on plan assets	(22,375)		(19,297)		—		—		—		—		—		—		Other non-interest expense
Amortization:
Prior service cost	—		—		—		—		—		—		42		42		Other non-interest expense
Net loss	660		2,000		333		498		234		459		453		573		Other non-interest expense
Net periodic (income) benefit cost	$	(9,605)	$	(5,711)	$	903	$	1,056	$	1,061	$	1,272	$	1,331	$	1,413