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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance [Line Items]      
Balance, beginning of period $ 147,124 $ 139,857  
Charge-offs (3,583) (2,588)  
Recoveries 2,875 10,773  
Transfer from the allowance for losses on covered loans [1]   2,416  
(Recovery of) provision for non-covered loan losses 4,180 (15,004) $ (18,587)
Balance, end of period 158,290 147,124 139,857
Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for non-covered loan losses 11,874 (3,334)  
Mortgage Receivable      
Valuation Allowance [Line Items]      
Balance, beginning of period 124,478 122,616  
Charge-offs (170) (1,315)  
Recoveries 1,272 5,765  
Transfer from the allowance for losses on covered loans [1]   2,250  
Balance, end of period 125,416 124,478 122,616
Mortgage Receivable | Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for non-covered loan losses (164) (4,838)  
Other loans      
Valuation Allowance [Line Items]      
Balance, beginning of period 22,646 17,241  
Charge-offs (3,413) (1,273)  
Recoveries 1,603 5,008  
Transfer from the allowance for losses on covered loans [1]   166  
Balance, end of period 32,874 22,646 $ 17,241
Other loans | Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for non-covered loan losses $ 12,038 $ 1,504  
[1] Represents the allowance associated with $14.2 million of loans acquired in the Desert Hills transaction that were transferred from covered loans to non-covered loans upon expiration of the related FDIC loss sharing agreement in March 2015.