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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Significant Accounting Policies [Line Items] |  |  |  |
Cash and cash equivalents, interest-bearing deposits in other financial institutions | $ 557,850,000 | $ 537,674,000 | $ 564,150,000 | $ 644,550,000
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York | 138,600,000 | 119,200,000 |  |
Cash and cash equivalents, federal funds sold | 6,800,000 | 4,600,000 |  |
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 | 162,100,000 | 158,300,000 |  |
Goodwill impairment losses | 0 | 0 | 0 |
Depreciation and amortization | 32,811,000 | 31,497,000 | 27,792,000 |
Bank-owned life insurance | 949,026,000 | 931,627,000 |  |
Bank-owned life insurance income | 31,015,000 | 27,541,000 | $ 27,150,000 |
Purchase of bank-owned life insurance policy | 0 | 0 |  |
Other real estate owned | 28,598,000 | 39,882,000 |  |
Other real estate owned, covered by FDIC loss sharing agreements | $ 16,990,000 | $ 25,817,000 |  |
Shares available for grant | 9,646,760 |  |  |
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 | 9,646,760 |  |  |
Two Thousand Twelve Incentive Plan |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Shares transferred | 1,030,673 |  |  |
AmTrust Bank |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Loss sharing agreements, expiration | 2019-12 |  |  |
Desert Hills Bank |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Loss sharing agreements, expiration | 2020-03 |  |  |
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 |  |  |
Core deposit intangibles | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Core deposit intangible, estimated useful lives (in years) | 10 years |  |  |

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