Loans Receivable and Allowance for Credit Losses - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) loan	Jun. 30, 2023 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($) loan	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held-for-sale	$ 0		$ 0			$ 0
Gain on sale of loans held-for-sale	181,000	$ 177,000	366,000	$ 968,000
Loss on sale of loans held-for-sale	0	305,000	0	305,000
Purchases of loans receivable	0	0	0	14,729,000
Loans receivable	7,819,011,000		7,819,011,000			7,874,537,000
Carrying value of servicing liability	$ 534,200,000		$ 534,200,000			$ 551,000,000.0
Threshold period, past due status of financial receivables			30 days
Threshold period, past due for nonperforming status of financial receivables	90 days		90 days			90 days
Non-accrual	$ 25,300,000		$ 25,300,000			$ 12,600,000
Financing receivable, excluding accrued interest, 90 days or more past due, still accruing	0		0			0
Real estate owned	2,000,000.0		2,000,000.0			0
Accrued interest receivable on loans receivable	33,200,000		33,200,000			32,900,000
Specific Allowance	76,000		76,000			614,000
Impaired loans for which there are no related allowance for loan losses	20,146,000		20,146,000			19,919,000
Off-balance sheet, credit loss, liability	3,988,000	6,330,000	3,988,000	6,330,000	$ 4,654,000	5,484,000	$ 6,442,000	$ 6,970,000
(Reversal of) provision for credit losses	(666,000)	(112,000)	(1,496,000)	(640,000)
Stewardship Financial Corporation | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,500,000		1,500,000			1,700,000
Freehold Entities | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	254,000		254,000			2,800,000
RSI Entites | Financial Asset Acquired with Credit Deterioration
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	10,400,000		10,400,000			10,600,000
Less Than 90 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual	$ 20,000,000.0		$ 20,000,000.0			$ 1,600,000
Financial receivable, number of loans in nonaccrual status | loan	23		23			10
Commercial business loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	$ 1,900,000		$ 4,000,000.0
Specific Allowance	76,000		76,000			$ 154,000
Impaired loans for which there are no related allowance for loan losses	10,816,000		10,816,000			5,814,000
Commercial business loans | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	624,000		624,000			809,000
Real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale		1,900,000		11,300,000
Real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale	$ 1,300,000	3,200,000	2,700,000	3,800,000
Real estate loans | One-to-four family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale		48,000,000.0	$ 236,000	57,800,000
Mortgage loans in process of foreclosure, number of loans | loan	4		4
Mortgage loans in process of foreclosure, amount	$ 1,300,000		$ 1,300,000
Specific Allowance	0		0			186,000
Impaired loans for which there are no related allowance for loan losses	$ 378,000		$ 378,000			$ 1,170,000
Real estate loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Proceeds from sales of loans held-for-sale		$ 6,100,000		$ 21,400,000
Consumer loans | Home equity loans and advances
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans in process of foreclosure, number of loans | loan	2		2			1
Mortgage loans in process of foreclosure, amount	$ 75,000		$ 75,000			$ 93,000
Specific Allowance	0		0			30,000
Impaired loans for which there are no related allowance for loan losses	$ 14,000		$ 14,000			$ 145,000
Consumer loans | Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage loans in process of foreclosure, number of loans | loan						1
Mortgage loans in process of foreclosure, amount						$ 576,000