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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Valuation Allowance [Line Items]    
Balance, beginning of period $ 147,124 $ 139,857
Charge-offs (194) (798)
Recoveries 1,127 1,563
Transfer from the allowance for losses on covered loans [1]   2,416
Provision for (recovery of) non-covered loan losses (176) 7
Balance, end of period 150,778 142,168
Non-Covered Loans    
Valuation Allowance [Line Items]    
Provision for (recovery of) non-covered loan losses 2,721 (870)
Mortgage Receivable    
Valuation Allowance [Line Items]    
Balance, beginning of period 124,478 122,616
Charge-offs (46) (485)
Recoveries 879 1,400
Transfer from the allowance for losses on covered loans [1]   2,250
Balance, end of period 126,185 119,178
Mortgage Receivable | Non-Covered Loans    
Valuation Allowance [Line Items]    
Provision for (recovery of) non-covered loan losses 874 (6,603)
Other loans    
Valuation Allowance [Line Items]    
Balance, beginning of period 22,646 17,241
Charge-offs (148) (313)
Recoveries 248 163
Transfer from the allowance for losses on covered loans [1]   166
Balance, end of period 24,593 22,990
Other loans | Non-Covered Loans    
Valuation Allowance [Line Items]    
Provision for (recovery of) non-covered loan losses $ 1,847 $ 5,733
[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.