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Federal, State and Local Taxes - Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]          
Federal – current     $ (147,691) $ 4,069 $ 89,187
State and local – current     5,044 23,382 22,868
Total current     (142,647) 27,451 112,055
Federal – deferred     189,826 100,971 13,058
State and local – deferred     29,516 (158) 10,139
Total deferred $ 31,279 $ 44,465 219,342 100,813 23,197
Income tax expense reported in net income $ 50,500 $ 14,915 76,695 128,264 135,252
Securities available-for-sale     15,648 16,142 (32,162)
Pension liability adjustments     293 5,033 4,897
Cash flow hedge     (12,852) 333  
Non-credit portion of OTTI losses       0 821
Adoption of ASU 2016-13     $ (3,972)    
Accounting Standards Update [Extensible List] Accounting Standards Update 2016-13   Accounting Standards Update 2016-13    
Total income taxes     $ 75,812 $ 149,772 $ 108,808