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Loans Receivable and Allowance for Credit Losses (Schedule of Summarized Loans Receivable) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans $ 9,568,028 $ 9,839,858
Premiums on purchased loans 1,313 1,566
Unearned discounts (6) (12)
Net deferred fees (14,735) (18,522)
Total gross loans 9,554,600 9,822,890
Residential    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,230,018 1,294,702
Commercial    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 3,704,684 3,458,666
Multi-Family    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,379,773 1,484,515
Construction    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 685,792 541,939
Mortgage Portfolio Segment    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 7,000,267 6,779,822
Mortgage Portfolio Segment | Residential    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,230,018 1,294,702
Mortgage Portfolio Segment | Commercial    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 3,704,684 3,458,666
Mortgage Portfolio Segment | Multi-Family    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,379,773 1,484,515
Mortgage Portfolio Segment | Construction    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 685,792 541,939
Commercial Loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 2,234,020 2,567,470
Consumer Loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans $ 333,741 $ 492,566