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Federal, State and Local Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]          
Outstanding amount of the investment   $ 35,400,000 $ 37,800,000    
Other commitments of additional anticipated equity contributions relating to current investments   $ 18,300,000 21,700,000    
Commitments period   3 years      
Effect of adopting Accounting Standards Update 2014-01     (1,303,000)    
Affordable housing tax credits and other tax benefits recognized   $ 3,200,000 3,900,000    
Affordable housing tax credits and other tax benefits, related amortization recognized   2,400,000 2,900,000    
Affordable housing tax credits and other tax benefits, impairment losses   0 0    
Total assets   $ 50,317,796,000 48,559,217,000    
Percentage of alternative tax on apportioned capital   0.15%      
Alternative tax capped value, New York State   $ 5,000,000      
Alternative tax - phased out period   6 years      
Unrecognized gross tax benefits   $ 30,456,000 24,779,000 $ 20,250,000 $ 24,220,000
Total amount of net unrecognized tax benefits that would affect the effective tax rate, if recognized   19,800,000      
Income tax benefit attributed to interest and penalties   1,100,000 700,000 $ 900,000  
Accrued interest and penalties on tax liabilities   5,000,000 3,400,000    
Net deferred tax liabilities     $ 20,266,000    
Maximum          
Income Taxes [Line Items]          
Estimated change in balance of unrecognized tax benefit, within next twelve months   (14,000,000)      
New York State Division of Taxation and Finance          
Income Taxes [Line Items]          
Net operating loss carryforward   $ 169,200,000      
Operating loss carryforward , expiration year   2035      
Effective tax rate   7.10%      
New York State Division of Taxation and Finance | Scenario, Forecast          
Income Taxes [Line Items]          
Effective tax rate 6.50%        
New York City          
Income Taxes [Line Items]          
Net operating loss carryforward   $ 478,800,000      
Operating loss carryforward , expiration year   2035      
Alternative tax capped value, New York State   $ 10,000,000      
New York City | Financial institutions with total assets below $100 billion          
Income Taxes [Line Items]          
Effective tax rate   9.00%      
New York City | Tax benefit on Interest income earned or situated in low-income communities phased out for financial institutions with total assets | Minimum          
Income Taxes [Line Items]          
Total assets   $ 100,000,000,000      
New York City | Tax benefit on Interest income earned or situated in low-income communities phased out for financial institutions with total assets | Maximum          
Income Taxes [Line Items]          
Total assets   150,000,000,000      
New York City | Scenario, Forecast | Financial institutions with total assets below $100 billion          
Income Taxes [Line Items]          
Effective tax rate 8.85%        
Special Federal Tax Provision          
Income Taxes [Line Items]          
Tax bad debt base-year reserves   61,500,000      
Net deferred tax liabilities   $ 21,500,000