Components of Net Periodic Benefit Costs (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2023 and 2022, includes the following components:

	For the Three Months Ended March 31,
	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	$	1,199	$	1,966	$	69	$	93	$	54	$	87	$	69	$	125	Compensation and employee benefits
Interest cost	2,790		2,031		158		97		242		150		204		142		Other non-interest expense
Expected return on plan assets	(7,479)		(7,559)		—		—		—		—		—		—		Other non-interest expense
Amortization:
Prior service cost	—		—		—		—		—		—		14		14		Other non-interest expense
Net loss	—		—		14		111		—		78		—		151		Other non-interest expense
Net periodic (income) benefit cost	$	(3,490)	$	(3,562)	$	241	$	301	$	296	$	315	$	287	$	432

Net periodic (income) benefit cost for the Pension Plan and Post-retirement Plan for the three months ended March 31, 2023 includes the following components:

13.    Components of Net Periodic Benefit Cost (continued)

	For the Three Months Ended March 31, 2023
	Pension Plan		Post-retirement Plan		Affected Line Item in the Consolidated Statements of Income
	(In thousands)
Service cost	$	—	$	17	Compensation and employee benefits
Interest cost	76		27		Other non-interest expense
Expected return on plan assets	(122)		—		Other non-interest expense
Amortization:
Net (gain)	—		(15)		Other non-interest expense
Net periodic (income) benefit cost	$	(46)	$	29