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Loans Receivable and Allowance for Loan Losses - Impact of ASC 326 Adoption (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses $ 101,466   $ 55,525 $ 55,562 $ 60,195
Mortgage Portfolio          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses 25,511        
Mortgage Portfolio | Residential          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses 3,414        
Mortgage Portfolio | Commercial          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses 12,831        
Mortgage Portfolio | Multifamily          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses 3,374        
Mortgage Portfolio | Construction          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses 5,892        
Commercial loans          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses 27,084   28,263 25,693  
Consumer loans          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses $ 6,075   $ 1,751 $ 2,191  
Cumulative Effect, Period of Adoption, Adjusted Balance          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   $ 63,445      
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   39,739      
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Residential          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   8,950      
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Commercial          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   17,118      
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Multifamily          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   9,519      
Cumulative Effect, Period of Adoption, Adjusted Balance | Mortgage Portfolio | Construction          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   4,152      
Cumulative Effect, Period of Adoption, Adjusted Balance | Commercial loans          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   18,254      
Cumulative Effect, Period of Adoption, Adjusted Balance | Consumer loans          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   5,452      
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   7,920      
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   14,228      
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Residential          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   5,536      
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Commercial          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   4,287      
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Multifamily          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   6,145      
Cumulative Effect, Period of Adoption, Adjustment | Mortgage Portfolio | Construction          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   (1,740)      
Cumulative Effect, Period of Adoption, Adjustment | Commercial loans          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   (10,009)      
Cumulative Effect, Period of Adoption, Adjustment | Consumer loans          
New Accounting Pronouncement, Early Adoption [Line Items]          
Allowance for credit losses   $ 3,701