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Income Taxes - Schedule of Income Taxes Expenses Benefit Reconciliation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income taxes at statutory federal income tax rate $ 371,599 $ 534,925 $ 526,730
Increase (decrease) in taxes:      
Tax-exempt income (22,806) (27,319) (26,186)
State and local income taxes, net of federal income tax effect 71,127 118,085 112,451
Qualified affordable housing project federal tax credits, net (14,826) (15,324) (12,240)
Other 11,275 7,745 (10,595)
Income taxes $ 416,369 $ 618,112 $ 590,160