Benefit Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Discount rate used to compute the obligation	2.87%	2.52%
Projected benefit obligation	$ 180,204	$ 190,849
Obligation included in other comprehensive loss, net of tax	25,206	36,461
Benefit expense	(11,316)	(11,256)	$ (10,076)
Salary expense	29,000	25,100	19,100
Expense for contributions to savings and investment plan	$ 10,700	10,100	8,600
Maximum annual salary deferral, percent	5.00%
Vesting period of employer matching contributions	2 years
Unsecured general liability	$ 2,400	1,700
Stock-based compensation expense	20,887	16,154	14,726
Unrecognized stock-based compensation	$ 18,600
Average remaining vesting, years	1 year 9 months 25 days
Award vesting period	1 year
Vesting percentage	8.33%
Stock Options and Restricted Stock
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Stock-based compensation expense	$ 20,900	16,500	15,000
Stock awards granted	$ 1,600	$ 1,500	$ 2,100
Share-based compensation, expiration period	1 year
Performance Shares
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting period	3 years
RSUs
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award vesting period	3 years
Vesting percentage	33.33%
2021 Incentive Compensation Plan | Common Stock
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Share-based compensation, shares authorized (up to) (in shares)	9,000,000
Shares of common stock available for issuance (in shares)	7,400,000
2016 Incentive Compensation Plan | Common Stock
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Reduction of shares available to issue for shares granted after 2020 year end (in shares)	1
Employee Stock Incentive Plan | Performance-Based RSU
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Weighted average grant date fair value (usd per share)	$ 12.36	$ 10.99	$ 10.14
Employee Stock Incentive Plan | Time-Based RSU
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Weighted average grant date fair value (usd per share)	$ 12.01	$ 10.29	$ 10.32
Nonqualified Plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Projected benefit obligation	$ 18,911	$ 20,513
Expense for contributions to savings and investment plan	415	372	$ 273
Nonqualified Plan | Oritani Financial Corp.
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Split dollar life insurance liability	1,700	1,800
Nonqualified Plan | Oritani Financial Corp. | Split-Dollar Plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Benefit expense	104	812
Nonqualified Plan | Former Directors And Senior Management
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Projected benefit obligation	348	399
Obligation included in other comprehensive loss, net of tax	660	731
Obligation included in other comprehensive loss, tax	257	286
Obligation included in other comprehensive loss, net of tax, amount expected to be reclassified	917
Nonqualified Plan | Other pension plan | Oritani Financial Corp.
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Projected benefit obligation	979	1,300
Nonqualified Plan | Other pension plan | Non Qualified Plans For Former Directors
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Projected benefit obligation	1,300	1,400
Nonqualified Plan | Supplemental Executive Retirement Income Agreement | Oritani Financial Corp.
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Projected benefit obligation	$ 13,900	13,600
Benefits payment period	20 years
Benefit expense	$ 357	$ 1,500
Fixed income securities | Qualified Plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Target asset allocation percentage	50.00%
Fixed income securities | Qualified Plan | Consumer Price Index
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cumulative annual real return, period	5 years
Fixed income securities | Qualified Plan | Merrill Lynch Intermediate Government/Corporate Index
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cumulative annual real return, period	3 years
Equity securities | Qualified Plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Target asset allocation percentage	50.00%
Equity securities | Qualified Plan | Consumer Price Index
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cumulative annual real return, period	5 years
Equity securities | Qualified Plan | S&P 500 Index
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Cumulative annual real return, period	3 years