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Loans Receivable and Allowance for Credit Losses on Loans (Schedule of Summarized Loans Receivable) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans $ 7,376,284 $ 7,337,564
Premiums on purchased loans 2,300 2,474
Unearned discounts (26) (26)
Net deferred fees (7,251) (7,873)
Total loans 7,372,044 7,332,885
Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 7,376,284 7,337,564
Purchased credit-impaired (PCI) loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 737 746
Mortgage Portfolio Segment    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 5,293,018 5,311,445
Mortgage Portfolio Segment | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 5,293,018 5,311,445
Mortgage Portfolio Segment | Residential    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,106,670 1,077,689
Mortgage Portfolio Segment | Residential | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,106,670 1,077,689
Mortgage Portfolio Segment | Commercial    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 2,555,091 2,578,393
Mortgage Portfolio Segment | Commercial | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 2,555,091 2,578,393
Mortgage Portfolio Segment | Multi-Family    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,222,313 1,225,551
Mortgage Portfolio Segment | Multi-Family | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,222,313 1,225,551
Mortgage Portfolio Segment | Construction    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 408,944 429,812
Mortgage Portfolio Segment | Construction | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 408,944 429,812
Commercial Loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,703,669 1,634,759
Commercial Loans | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 1,703,669 1,634,759
Commercial Loans | Commercial Owner, Occupied | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 935,669 853,269
Commercial Loans | Commercial Non-Owner, Occupied | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 719,780 732,277
Commercial Loans | Other Commercial Loans | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 48,220 49,213
Consumer Loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans 379,597 391,360
Consumer Loans | Loans, excluding purchased credit-impaired loans    
Servicing Liability at Amortized Cost [Line Items]    
Total gross loans $ 379,597 $ 391,360