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Loans Receivable and Allowance for Credit Losses (Schedule of Summarized Loans Receivable) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans $ 9,774,593 $ 7,337,564
Premiums on purchased loans 1,514 2,474
Unearned discounts (26) (26)
Net deferred fees (19,272) (7,873)
Total loans 9,756,809 7,332,885
Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 9,774,593  
Purchased credit-impaired (PCI) loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 0 746
Mortgage Portfolio Segment    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 7,077,946 5,311,445
Mortgage Portfolio Segment | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 7,077,946 5,311,445
Mortgage Portfolio Segment | Residential    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,320,222 1,077,689
Mortgage Portfolio Segment | Residential | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,320,222  
Mortgage Portfolio Segment | Commercial    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 3,750,639 2,578,393
Mortgage Portfolio Segment | Commercial | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 3,750,639  
Mortgage Portfolio Segment | Multi-Family    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,544,924 1,225,551
Mortgage Portfolio Segment | Multi-Family | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,544,924  
Mortgage Portfolio Segment | Construction    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 462,161 429,812
Mortgage Portfolio Segment | Construction | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 462,161  
Commercial Loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 2,290,196 1,634,759
Commercial Loans | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 2,290,196 1,634,759
Commercial Loans | Commercial owner occupied | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 934,104 853,269
Commercial Loans | Commercial non-owner occupied | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 906,355 732,277
Commercial Loans | Other commercial loans | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 449,737 49,213
Consumer Loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 406,451 $ 391,360
Consumer Loans | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans $ 406,451