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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, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Provision of Income Taxes [Line Items]
Statutory federal income tax at 35%		$ 271,995	$ (46,204)	$ 270,573
State and local income taxes, net of federal income tax effect	[1]	30,772	(20,835)	36,394
Effect of tax deductibility of ESOP		(6,452)	(7,321)	(7,297)
Non-taxable income and expense of BOLI		(10,808)	(9,575)	(9,415)
Federal tax credits		(1,607)	(1,554)	(1,820)
Adjustments relating to prior tax years		(668)	(248)	(1,166)
Merger-related expenses		(850)	850
Other, net		(655)	30	400
Income tax expense (benefit) reported in net income		$ 281,727	$ (84,857)	$ 287,669
[1] Includes income tax (benefit) expense for the years ended December 31, 2015 and 2014 of $(1.4) million and $600,000, respectively, for adjustments to deferred taxes necessitated by changes in tax laws of New York City and New York State that were enacted in April 2015 and March 2014, respectively.

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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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