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Loans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($) Investment | Dec. 31, 2014 USD ($) Investment | Dec. 31, 2013 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties |  | $ 105,600,000 | $ 129,500,000 |
Non-Covered Loans |  | $ 35,740,489,000 | $ 33,004,361,000 |
Number of loans classified as a non-accrual TDRs | Investment |  | 8 | 8 |
Covered loans |  | $ 2,060,089,000 | $ 2,428,622,000 |
Recovery of loan losses |  | (15,004,000) | (18,587,000) | $ 30,758,000
FDIC indemnification expense |  | 9,300,000 | 14,900,000 |
Financing Receivable Troubled Debt Restructurings Rate Reductions |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  | 9,300,000 |  |
Financing Receivable Troubled Debt Restructurings Forbearance Of Arrears |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Delinquent loans selectively extended to certain borrowers, rate reductions, forbearance of arrears, and extension of maturity dates |  | $ 2,900,000 |  |
Home equity loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 1 |  |
Loan classified as non accrual TDRs |  | $ 143,000 |  |
Purchased Credit Impaired loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Non-Covered Loans | [1] | 8,344,000 |  |
Purchased credit-impaired loans outstanding |  | 10,200,000 |  |
Principal shareholders |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties |  | 0 | 0 |
Covered Loans |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Current |  | 1,900,000,000 |  |
Recovery of loan losses |  | (11,670,000) | (18,587,000) | $ 12,758,000
Covered Loans | Loans 90 Days Or More Past Due |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Past Due |  | 137,182,000 | 157,889,000 |
Covered Loans | Performing Financial Instruments | Financing Receivable Recorded Investment 30 to 89 days past due |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Past Due |  | 32,800,000 |  |
Covered Loans | Performing Financial Instruments | Loans 90 Days Or More Past Due |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total Past Due |  | 137,200,000 |  |
Am Trust Bank and Desert Hills Bank |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Total loans, net |  | $ 2,500,000,000 | $ 2,900,000,000 |
[1] | Includes $941,000 of multi-family loans; $6.0 million of commercial real estate loans; $835,000 of acquisition, development, and construction loans; $436,000 of commercial and industrial loans; and $162,000 of other loans that were included in "Covered loans" at December 31, 2014.

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