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Loans - Additional Information (Detail)
 12 Months Ended
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.