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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 29, 2017 USD ($) Reporting_unit | Jul. 28, 2017 USD ($) | Dec. 31, 2018 | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents, interest-bearing deposits in other financial institutions |  |  |  | $ 2,528,169,000 | $ 557,850,000 | $ 537,674,000 | $ 564,150,000
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York |  |  |  | 2,100,000 | 138,600,000 |  |
Cash and cash equivalents, federal funds sold |  |  |  | 3,100,000 | 6,800,000 |  |
Cash and cash equivalents, outstanding reverse repurchase agreements |  |  |  | 250,000,000 | 250,000,000 |  |
Minimum amount required to be maintained as total reserves with the Federal Reserve Bank of New York |  |  |  | 763,400,000 | 162,100,000 |  |
Mortgage servicing rights asset |  |  |  | 2,729,000 | 228,099,000 |  |
Loans held for sale |  |  |  | 35,258,000 | 409,152,000 |  |
Gain on sale of business |  |  |  | 0 |  |  |
Covered loans |  | $ 0 |  | 0 | 1,698,133,000 |  |
Allowance for losses on covered loans |  |  |  | 0 | 23,701,000 | 31,395,000 |
Number of reporting units | Reporting_unit | 2 |  |  |  |  |  |
Goodwill impairment losses |  |  |  | 0 |  |  |
Depreciation and amortization |  |  |  | 32,803,000 | 32,811,000 | 31,497,000 |
Bank-owned life insurance |  |  |  | 967,173,000 | 949,026,000 |  |
Bank-owned life insurance income |  |  |  | 27,133,000 | 31,015,000 | $ 27,541,000 |
Purchase of bank-owned life insurance policy |  |  |  | 0 | 0 |  |
Other real estate owned |  |  |  | $ 16,400,000 | $ 28,598,000 |  |
Shares available for grant | shares |  |  |  | 7,135,071 |  |  |
Federal corporate income tax rate |  |  |  | 35.00% | 35.00% | 35.00% |
Freedom Mortgage Corporation |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Mortgage servicing rights asset | $ 208,800,000 |  |  |  |  |  |
Loans held for sale | 20,500,000,000 |  |  | $ 35,300,000 | $ 409,200,000 |  |
Gain on sale of business | 7,400,000 |  |  |  |  |  |
Proceeds from sale of business | $ 226,600,000 |  |  |  |  |  |
Cerberus Capital Management, L. P. | One-to-four family |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Gain on sale of business |  | 74,600,000 |  |  |  |  |
Proceeds from sale of business |  | $ 1,900,000,000 |  |  |  |  |
ASU 2018-02 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Federal corporate income tax rate |  |  |  | 35.00% |  |  |
Scenario, Forecast |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Federal corporate income tax rate |  |  | 21.00% |  |  |  |
Scenario, Forecast | ASU 2018-02 |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Federal corporate income tax rate |  |  | 21.00% |  |  |  |
Taxi Medallion Loans |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Other real estate owned |  |  |  | $ 8,200,000 | $ 0.0 |  |
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 | shares |  |  |  | 7,135,071 |  |  |
Two Thousand Twelve Incentive Plan |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Shares transferred | shares |  |  |  | 1,030,673 |  |  |
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://www.xbrl.org/2003/role/presentationRef -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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