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Summary of Significant Accounting Policies - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Jan. 01, 2020
USD ($)
Mar. 31, 2021
USD ($)
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment
shares
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]              
Cash and cash equivalents, interest-bearing deposits in other financial institutions   $ 2,722,915,000   $ 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   197,758,000 $ 162,244,000 194,043,000 147,638,000 159,820,000  
Retained earnings   552,566,000   494,229,000 342,023,000    
Increase in allowance for credit losses on loans and leases $ 1,900,000 4,841,000 189,000 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 2,426,379,000    
Number of operating segments | Segment       1      
Number of reportable segments | Segment       1      
Goodwill impairment       $ 0      
Depreciation   5,357,000 6,407,000 23,871,000 27,096,000 32,323,000  
Bank-owned life insurance   1,165,765,000   1,164,196,000 1,145,058,000    
Additional purchases of BOLI         150,000,000.0    
Bank-owned life insurance income   $ 6,890,000 $ 7,389,000 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   8,481,554   11,913,461      
Cumulative Effect, Period of Adoption, Adjustment              
Significant Accounting Policies [Line Items]              
Allowance for loan and lease losses         1,911,000    
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   $ 12,300,000   $ 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 2016-13 | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment              
Significant Accounting Policies [Line Items]              
Retained earnings       $ (10,500,000)      
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. 31, 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