Components of Net Periodic Benefit Costs (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Net periodic benefit (income) cost for Pension Plan, RIM Plan, Post-retirement Plan and split-dollar life insurance arrangement plan benefits for the three and six months ended June 30, 2020 and 2019, includes the following components:

	For the Three Months Ended June 30,
	Pension Plan						RIM Plan				Post-retirement Plan				Split-Dollar Life Insurance
	2020			2019			2020		2019		2020		2019		2020		2019		Affected Line Item in the Consolidated Statements of Income
	(In thousands)
Service cost	$	1,937		$	1,501		$	67	$	53	$	99	$	84	$	120	$	88	Compensation and employee benefits
Interest cost	2,031			2,194			102		116		171		207		131		114		Other non-interest expense
Expected return on plan assets	(5,737		)	(4,727		)	—		—		—		—		—		—		Other non-interest expense
Amortization:
Prior service cost	—			—			—		—		—		—		14		14		Other non-interest expense
Net loss	781			765			99		61		77		37		113		62		Other non-interest expense
Net periodic (income) benefit cost	$	(988	)	$	(267	)	$	268	$	230	$	347	$	328	$	378	$	278

	For the Six Months Ended June 30,
	Pension Plan						RIM Plan				Post-retirement Plan				Split-Dollar Life Insurance
	2020			2019			2020		2019		2020		2019		2020		2019		Affected Line Item in the Consolidated Statements of Income
	(In thousands)
Service cost	$	3,874		$	3,002		$	134	$	106	$	198	$	168	$	226	$	176	Compensation and employee benefits
Interest cost	4,062			4,388			204		232		342		414		245		228		Other non-interest expense
Expected return on plan assets	(11,474		)	(9,454		)	—		—		—		—		—		—		Other non-interest expense
Amortization:
Prior service cost	—			—			—		—		—		—		28		28		Other non-interest expense
Net loss	1,562			1,530			198		122		154		74		226		124		Other non-interest expense
Net periodic (income) benefit cost	$	(1,976	)	$	(534	)	$	536	$	460	$	694	$	656	$	725	$	556