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Federal, State and Local Taxes - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income Taxes [Line Items] |  |  |  |  |
Federal corporate income tax rate |  | 35.00% | 35.00% | 35.00% |
Income tax benefit due to change in tax rate |  | $ 42,000,000 |  |  |
Total assets |  | $ 49,124,195,000 | $ 48,926,555,000 | $ 50,317,796,000 |
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 |  |  |
Outstanding amount of the investment |  | $ 46,200,000 | 42,400,000 |  |
Other commitments of additional anticipated equity contributions relating to current investments |  | $ 23,900,000 | 21,900,000 |  |
Commitments period |  | 4 years |  |  |
Affordable housing tax credits and other tax benefits recognized |  | $ 4,500,000 | 4,000,000 | 3,200,000 |
Affordable housing tax credits and other tax benefits, related amortization recognized |  | 3,100,000 | 3,000,000 | 2,400,000 |
Affordable housing tax credits and other tax benefits, impairment losses |  | 0 | 0 | 0 |
Unrecognized gross tax benefits |  | 33,681,000 | 33,487,000 | 30,456,000 | $ 24,779,000
Total amount of net unrecognized tax benefits that would affect the effective tax rate, if recognized |  | 26,600,000 |  |  |
Income tax benefit attributed to interest and penalties |  | 1,800,000 | 1,200,000 | $ 1,100,000 |
Accrued interest and penalties on tax liabilities |  | 8,900,000 | 6,900,000 |  |
Net deferred tax liabilities |  | $ 84,797,000 | $ 32,611,000 |  |
Scenario, Forecast |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Federal corporate income tax rate | 21.00% |  |  |  |
Assets for disallowance of deduction for FDIC premium | $ 50,000,000,000 |  |  |  |
Percentage of limitations on NOL carryforwards to taxable income | 80.00% |  |  |  |
Minimum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Dividends received deduction |  | 70.00% |  |  |
Minimum | Scenario, Forecast |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Dividends received deduction | 50.00% |  |  |  |
Maximum |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Dividends received deduction |  | 80.00% |  |  |
Estimated change in balance of unrecognized tax benefit, within next twelve months |  | $ 20,000,000 |  |  |
Maximum | Scenario, Forecast |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Dividends received deduction | 65.00% |  |  |  |
New York State Division of Taxation and Finance |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Effective tax rate |  |  | 6.50% | 7.10% |
New York City |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforward |  | $ 44,900,000 |  |  |
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 |  |  | 8.85% | 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 |  |  |
Special Federal Tax Provision |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Tax bad debt base-year reserves |  | 61,500,000 |  |  |
Net deferred tax liabilities |  | $ 12,900,000 |  |  |

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