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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2018
Sep. 29, 2017
Jul. 28, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Accounting Policies [Line Items]              
Cash and cash equivalents, interest-bearing deposits in other financial institutions       $ 1,474,955 $ 2,528,169 $ 557,850 $ 537,674
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York       1,300,000 2,100    
Cash and cash equivalents, federal funds sold       5,200 3,100    
Cash and cash equivalents, outstanding reverse repurchase agreements       250,000      
Minimum amount required to be maintained as total reserves with the Federal Reserve Bank of New York       846,500 763,400    
Mortgage servicing rights asset         2,729    
Loans held for sale         35,258    
Depreciation and amortization       32,323 32,803 32,811  
Bank-owned life insurance       977,627 967,173 967,200  
Bank-owned life insurance income       28,252 27,133 $ 31,015  
Other real estate owned       $ 10,794 $ 16,400    
Shares available for grant       4,951,108      
Federal corporate income tax rate       21.00% 35.00% 35.00%  
Goodwill       $ 2,436,131 $ 2,436,131    
Effects Of New Accounting Pronouncements Or Change In Accounting Principle $ 2,500            
Freedom Mortgage Corporation              
Significant Accounting Policies [Line Items]              
Mortgage servicing rights asset   $ 208,800          
Loans held for sale   20,500,000   $ 0 $ 35,300    
Gain on sale of business   7,400          
Proceeds from sale of business   $ 226,600          
Cerberus Capital Management, L. P. | One-to-four family              
Significant Accounting Policies [Line Items]              
Gain on sale of business     $ 74,600        
Proceeds from sale of business     $ 1,900,000        
ASU 2018-02              
Significant Accounting Policies [Line Items]              
Federal corporate income tax rate       21.00% 35.00%    
Taxi Medallion Loans              
Significant Accounting Policies [Line Items]              
Other real estate owned       $ 8,200 $ 8,200    
Building              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)           20 years  
Options and Restricted Stock              
Significant Accounting Policies [Line Items]              
Shares available for grant       4,951,108      
Minimum | Furniture and Fixtures              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)       3 years      
Minimum | Equipment              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)       3 years      
Maximum | Furniture and Fixtures              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)       10 years      
Maximum | Equipment              
Significant Accounting Policies [Line Items]              
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)       10 years