Income Taxes - Schedule of Income Taxes Expenses Benefit Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income taxes at statutory federal income tax rate	$ 720,439	$ 586,142	$ 574,786
Increase (decrease) in taxes:
Tax-exempt income	(35,364)	(33,102)	(31,752)
State and city income taxes, net of federal income tax effect	79,155	60,988	50,788
Qualified affordable housing project federal tax credits, net	(15,091)	(15,297)	(14,827)
Other	(5,855)	(3,706)	(2,996)
Income taxes	$ 743,284	$ 595,025	$ 575,999