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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
Income Taxes [Line Items] |  |  |  |
Outstanding amount of the investment | $ 42,400,000 | $ 35,400,000 |  |
Other commitments of additional anticipated equity contributions relating to current investments | $ 21,900,000 | 18,300,000 |  |
Commitments period | 4 years |  |  |
Effect of adopting Accounting Standards Update 2014-01 |  |  | $ (1,303,000) |
Affordable housing tax credits and other tax benefits recognized | $ 4,000,000 | 3,200,000 |  |
Affordable housing tax credits and other tax benefits, related amortization recognized | 3,000,000 | 2,400,000 |  |
Affordable housing tax credits and other tax benefits, impairment losses | 0 | 0 |  |
Total assets | $ 48,926,555,000 | 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 | $ 33,487,000 | 30,456,000 | 24,779,000 | $ 20,250,000
Total amount of net unrecognized tax benefits that would affect the effective tax rate, if recognized | 21,800,000 |  |  |
Income tax benefit attributed to interest and penalties | 1,200,000 | 1,100,000 | $ 700,000 |
Accrued interest and penalties on tax liabilities | 6,900,000 | $ 5,000,000 |  |
Net deferred tax liabilities | 32,611,000 |  |  |
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Estimated change in balance of unrecognized tax benefit, within next twelve months | (14,000,000) |  |  |
New York City |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforward | $ 354,900,000 |  |  |
Operating loss carryforward, expiration year | 2035 |  |  |
Alternative tax capped value, New York State | $ 10,000,000 |  |  |
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 | 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 | Financial institutions with total assets below $100 billion |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective tax rate | 8.85% | 9.00% |  |
New York State Division of Taxation and Finance |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective tax rate | 6.50% | 7.10% |  |
Special Federal Tax Provision |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax bad debt base-year reserves | $ 61,500,000 |  |  |
Net deferred tax liabilities | $ 21,500,000 |  |  |

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- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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