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Reconciliation of Statutory Federal Income Tax Expense (Benefit) Reported in Net Income to Combined Actual Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Provision of Income Taxes [Line Items]
Statutory federal income tax at 35%		$ 233,875	$ 271,995	$ (46,204)
State and local income taxes, net of federal income tax effect	[1]	29,204	30,772	(20,835)
Effect of tax law changes		(41,943)
Effect of tax deductibility of ESOP		(5,083)	(6,452)	(7,321)
Non-taxable income and expense of BOLI		(9,529)	(10,808)	(9,575)
Federal tax credits		(1,386)	(1,607)	(1,554)
Adjustments relating to prior tax years		144	(668)	(248)
Merger-related expenses			(850)	850
Other, net		(3,268)	(655)	30
Income tax expense (benefit) reported in net income		$ 202,014	$ 281,727	$ (84,857)
[1] Includes income tax (benefit) expense for the years ended December 31, 2015 of $(1.4) million for adjustments to deferred taxes necessitated by changes in tax laws of New York City that were enacted in April 2015.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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