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Income Taxes - Schedule of Income Taxes Expenses Benefit Reconciliation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Income taxes at statutory federal income tax rate $ 534,925 $ 526,730 $ 813,352
Increase (decrease) in taxes:      
Tax-exempt income (27,319) (26,186) (40,778)
State and local income taxes, net of federal income tax effect 118,085 112,451 83,327
Qualified affordable housing project federal tax credits, net (15,324) (12,240) (16,015)
Initial impact of enactment of Tax Act     85,431
Other 7,745 (10,595) (9,761)
Income taxes $ 618,112 $ 590,160 $ 915,556