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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
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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 | $ 537,700,000 | $ 564,200,000 |
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York | 119,200,000 | 135,200,000 |
Cash and cash equivalents, federal funds sold | 4,600,000 | 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 | 158,300,000 | 129,500,000 |
Depreciation and amortization | 31,497,000 | 27,792,000 | $ 28,092,000
Bank-owned life insurance | 931,627,000 | 915,156,000 |
Bank-owned life insurance income | 27,541,000 | 27,150,000 | $ 29,938,000
Purchase of bank-owned life insurance policy | 0 | 0 |
Other real estate owned | 39,882,000 | 94,004,000 |
Other real estate owned, covered by FDIC loss sharing agreements | $ 25,817,000 | $ 32,048,000 |
Shares available for grant | 12,233,512 |  |
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 | 12,233,512 |  |
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 |  |
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 |  |
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 |  |
Core deposit intangibles | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Core deposit intangible, 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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