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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 02, 2018 | Sep. 29, 2017 | Jul. 28, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents, interest-bearing deposits in other financial institutions |  |  |  | $ 1,474,955 | $ 2,528,169 | $ 557,850 | $ 537,674
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York |  |  |  | 1,300,000 | 2,100 |  |
Cash and cash equivalents, federal funds sold |  |  |  | 5,200 | 3,100 |  |
Cash and cash equivalents, outstanding reverse repurchase agreements |  |  |  | 250,000 |  |  |
Minimum amount required to be maintained as total reserves with the Federal Reserve Bank of New York |  |  |  | 846,500 | 763,400 |  |
Mortgage servicing rights asset |  |  |  |  | 2,729 |  |
Loans held for sale |  |  |  |  | 35,258 |  |
Depreciation and amortization |  |  |  | 32,323 | 32,803 | 32,811 |
Bank-owned life insurance |  |  |  | 977,627 | 967,173 | 967,200 |
Bank-owned life insurance income |  |  |  | 28,252 | 27,133 | $ 31,015 |
Other real estate owned |  |  |  | $ 10,794 | $ 16,400 |  |
Shares available for grant |  |  |  | 4,951,108 |  |  |
Federal corporate income tax rate |  |  |  | 21.00% | 35.00% | 35.00% |
Goodwill |  |  |  | $ 2,436,131 | $ 2,436,131 |  |
Effects Of New Accounting Pronouncements Or Change In Accounting Principle | $ 2,500 |  |  |  |  |  |
Freedom Mortgage Corporation |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Mortgage servicing rights asset |  | $ 208,800 |  |  |  |  |
Loans held for sale |  | 20,500,000 |  | $ 0 | $ 35,300 |  |
Gain on sale of business |  | 7,400 |  |  |  |  |
Proceeds from sale of business |  | $ 226,600 |  |  |  |  |
Cerberus Capital Management, L. P. | One-to-four family |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Gain on sale of business |  |  | $ 74,600 |  |  |  |
Proceeds from sale of business |  |  | $ 1,900,000 |  |  |  |
ASU 2018-02 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Federal corporate income tax rate |  |  |  | 21.00% | 35.00% |  |
Taxi Medallion Loans |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Other real estate owned |  |  |  | $ 8,200 | $ 8,200 |  |
Building |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) |  |  |  |  |  | 20 years |
Options and Restricted Stock |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Shares available for grant |  |  |  | 4,951,108 |  |  |
Minimum | Furniture and Fixtures |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) |  |  |  | 3 years |  |  |
Minimum | Equipment |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) |  |  |  | 3 years |  |  |
Maximum | Furniture and Fixtures |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) |  |  |  | 10 years |  |  |
Maximum | Equipment |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) |  |  |  | 10 years |  |  |

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- Definition The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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