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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jan. 01, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segement
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]            
Cash and cash equivalents, interest-bearing deposits in other financial institutions   $ 1,947,931,000 $ 741,870,000 $ 1,474,955,000   $ 2,528,169,000
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York   1,600,000,000 608,400,000      
Cash and cash equivalents, federal funds sold   0 1,700,000      
Cash and cash equivalents, outstanding reverse repurchase agreements   193,500,000 0      
Allowance for loan and lease losses   194,043,000 147,638,000 159,820,000    
Retained earnings   494,229,000 342,023,000      
Increase in allowance for credit losses on loans and leases $ 1,900,000 3,393,000 1,020,000      
Off-balance sheet credit exposures before adoption of CECL 12,500,000          
Goodwill   $ 2,426,379,000 2,426,379,000   $ 2,400,000,000  
Number of operating segments | Segement   1        
Number of reportable segments | Segement   1        
Goodwill impairment   $ 0        
Depreciation   23,871,000 27,096,000 32,323,000    
Bank-owned life insurance   1,164,196,000 1,145,058,000      
Additional purchases of BOLI     150,000,000.0      
Bank-owned life insurance income   31,750,000 28,363,000 $ 28,252,000    
Other real estate owned   $ 1,800,000 2,000,000.0      
Shares available for grant | shares   11,913,461        
Taxi Medallion Loans            
Significant Accounting Policies [Line Items]            
Other real estate owned   $ 6,500,000 10,300,000      
Premises            
Significant Accounting Policies [Line Items]            
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)   20 years        
Furniture, Fixtures and Equipment | Minimum            
Significant Accounting Policies [Line Items]            
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)   3 years        
Furniture, Fixtures and Equipment | Maximum            
Significant Accounting Policies [Line Items]            
Premises, furniture, fixtures, and equipment, estimated useful lives (in years)   10 years        
Unfunded Commitments            
Significant Accounting Policies [Line Items]            
Allowance for credit losses   $ 11,900,000 $ 461,000      
Accounting Standards Update 2016-13            
Significant Accounting Policies [Line Items]            
Retained earnings $ (1,900,000)          
Change in accounting principle, accounting standards update, adopted [true false]   true        
Change in accounting principle, accounting standards update, adoption date   Jan. 01, 2020        
Accounting Standards Update 2020-04            
Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted [true false]   true        
Change in accounting principle, accounting standards update, adoption date   Mar. 30, 2020        
Change in accounting principle, accounting standards update, immaterial effect [true false]   true        
Accounting Standards Update 2018-13            
Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted [true false]   true        
Change in accounting principle, accounting standards update, adoption date   Jan. 01, 2020        
Change in accounting principle, accounting standards update, immaterial effect [true false]   true        
Accounting Standards Update 2017-04            
Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted [true false]   true        
Change in accounting principle, accounting standards update, adoption date   Jan. 01, 2020        
Change in accounting principle, accounting standards update, immaterial effect [true false]   true