Components of Net Periodic Benefit Costs (Details) - USD ($)		3 Months Ended		6 Months Ended
	Aug. 09, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Retirement Benefits [Abstract]
Years of employment benefits are based upon				5 years
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer contribution amount		$ 0		$ 0
Subsequent Event
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer contribution amount	$ 10,000,000
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		1,966,000	$ 2,150,000	3,932,000	$ 4,300,000
Interest cost		2,081,000	1,756,000	4,112,000	3,512,000
Expected return on plan assets		(7,633,000)	(6,318,000)	(15,192,000)	(12,636,000)
Amortization of Prior service cost		0	0	0	0
Amortization of Net loss		0	1,000,000	0	2,000,000
Net periodic (income) benefit cost		(3,586,000)	(1,412,000)	(7,148,000)	(2,824,000)
RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		93,000	100,000	186,000	200,000
Interest cost		97,000	86,000	194,000	172,000
Expected return on plan assets		0	0	0	0
Amortization of Prior service cost		0	0	0	0
Amortization of Net loss		111,000	166,000	222,000	332,000
Net periodic (income) benefit cost		301,000	352,000	602,000	704,000
Post-retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		110,000	130,000	197,000	260,000
Interest cost		173,000	141,000	323,000	282,000
Expected return on plan assets		0	0	0	0
Amortization of Prior service cost		0	0	0	0
Amortization of Net loss		78,000	153,000	156,000	306,000
Net periodic (income) benefit cost		361,000	424,000	676,000	848,000
Split-Dollar Life Insurance
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		128,000	141,000	253,000	282,000
Interest cost		153,000	125,000	295,000	250,000
Expected return on plan assets		0	0	0	0
Amortization of Prior service cost		14,000	14,000	28,000	28,000
Amortization of Net loss		151,000	191,000	302,000	382,000
Net periodic (income) benefit cost		446,000	471,000	878,000	942,000
Former Roselle Bank President | RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic (income) benefit cost		3,000	$ 4,000	6,000	$ 4,000
Former Freehold Bank President | RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic (income) benefit cost		2,000		4,000
Former RSI Bank President | RIM Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic (income) benefit cost		$ 11,000		$ 11,000