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Loans - Additional Information (Detail)	12 Months Ended
	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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Provision Recoveries For Loan Losses

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Number of financing receivables that have been modified by troubled debt restructurings.

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Financing receivables that are current.

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Recorded Investment in financing receivables that are past due at the balance sheet date.

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