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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant Accounting Policies [Line Items]        
Cash and cash equivalents, interest-bearing deposits in other financial institutions $ 741,870 $ 1,474,955 $ 2,528,169 $ 557,850
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York 608,400,000 1,300,000    
Cash and cash equivalents, federal funds sold 1,700 5,200    
Cash and cash equivalents, outstanding reverse repurchase agreements 0 0    
Depreciation and amortization 27,096 32,323 32,803  
Bank-owned life insurance 1,145,058 977,627    
Bank-owned life insurance income 28,363 28,252 $ 27,133  
Other real estate owned $ 2,000 2,600    
Shares available for grant 2,507,490      
Goodwill $ 2,426,379 2,436,131    
Additional purchases of BOLI 150,000 0    
Taxi Medallion Loans        
Significant Accounting Policies [Line Items]        
Other real estate owned $ 10,300 $ 8,200    
Building        
Significant Accounting Policies [Line Items]        
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) 20 years      
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