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Loans - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 92,300,000 |  | $ 92,300,000 |  | $ 105,600,000
Non-Covered Loans | 37,335,541,000 |  | 37,335,541,000 |  | 35,740,489,000
Covered loans | 1,789,164,000 |  | 1,789,164,000 |  | 2,060,089,000
Provision for (recovery of) losses | (55,000) | $ (9,028,000) | 664,000 | $ (8,687,000) |
FDIC indemnification expense | 1,000,000 | 6,800,000 | 4,800,000 | 4,300,000 |
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 |  |  | 16,600,000 |  |
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 |  |  | 2,800,000 |  |
Purchased Credit-Impaired Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans | 5,939,000 |  | 5,939,000 |  | 8,344,000
Purchased credit-impaired loans outstanding | 7,300,000 |  | 7,300,000 |  |
Principal shareholders |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | 0 |  | 0 |  | 0
Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Current | 1,600,000,000 |  | 1,600,000,000 |  |
Provision for (recovery of) losses | (1,289,000) | $ (8,516,000) | (6,035,000) | $ (5,433,000) |
Covered Loans | Loans 90 Days Or More Past Due |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total Past Due | 133,077,000 |  | 133,077,000 |  | 137,182,000
Covered Loans | Performing Financial Instruments | Financing Receivable Recorded Investment 30 to 89 days past due |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total Past Due | 26,400,000 |  | 26,400,000 |  |
Covered Loans | Performing Financial Instruments | Loans 90 Days Or More Past Due |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total Past Due | 133,100,000 |  | 133,100,000 |  |
Am Trust Bank and Desert Hills Bank |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total loans, net | $ 2,200,000,000 |  | $ 2,200,000,000 |  | $ 2,500,000,000

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