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Federal, State and Local Taxes - Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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 219,342 100,813 23,197
Income tax expense reported in net income 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] us-gaap:AccountingStandardsUpdate201613Member    
Total income taxes $ 75,812 $ 149,772 $ 108,808