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Loans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2016 USD ($) Investment | Dec. 31, 2015 USD ($) Investment | Dec. 31, 2014 USD ($) Investment
Financing Receivable, Recorded Investment [Line Items] |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | $ 91,800,000 | $ 105,600,000 |
Non-Covered Loans | $ 37,356,201,000 | $ 35,740,489,000 |
Number of loans classified as a non-accrual TDRs | Investment | 13 | 8 | 8
Covered loans | $ 1,698,133,000 | $ 2,060,089,000 |
Provision for (recovery of) losses | 4,180,000 | (15,004,000) | $ (18,587,000)
FDIC indemnification expense | 6,200,000 | 9,300,000 |
Am Trust Bank and Desert Hills Bank |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans, net | 2,100,000,000 | 2,500,000,000 |
Purchased Credit-Impaired Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | 5,762,000 | 8,344,000 |
Purchased credit-impaired loans outstanding | 7,000,000 |  |
Principal shareholders |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties | 0 | 0 |
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 | 17,100,000 |  |
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 |  |
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 |  |
Residential Mortgage |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Mortgage loans on real estate, foreclosures | 78,600,000 | 102,900,000 |
Covered Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Current | 1,500,000,000 |  |
Provision for (recovery of) losses | (7,694,000) | (11,670,000) | $ (18,587,000)
Covered Loans | Loans 90 Days Or More Past Due |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Past Due | 131,465,000 | $ 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 | 22,600,000 |  |
Covered Loans | Performing Financial Instruments | Loans 90 Days Or More Past Due |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total Past Due | $ 131,500,000 |  |

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