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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Valuation Allowance [Line Items]        
Balance, beginning of period     $ 147,124 $ 139,857
Charge-offs     (1,325) (1,323)
Recoveries     2,207 8,349
Transfer from the allowance for losses on covered loans [1]       2,416
Provision for (recovery of) non-covered loan losses $ (55) $ (9,028) 664 (8,687)
Balance, end of period 154,705 146,045 154,705 146,045
Non-Covered Loans        
Valuation Allowance [Line Items]        
Provision for (recovery of) non-covered loan losses 1,234 (512) 6,699 (3,254)
Mortgage Receivable        
Valuation Allowance [Line Items]        
Balance, beginning of period     124,478 122,616
Charge-offs     (170) (935)
Recoveries     1,251 4,197
Transfer from the allowance for losses on covered loans [1]       2,250
Balance, end of period 126,234 121,568 126,234 121,568
Mortgage Receivable | Non-Covered Loans        
Valuation Allowance [Line Items]        
Provision for (recovery of) non-covered loan losses     675 (6,560)
Other loans        
Valuation Allowance [Line Items]        
Balance, beginning of period     22,646 17,241
Charge-offs     (1,155) (388)
Recoveries     956 4,152
Transfer from the allowance for losses on covered loans [1]       166
Balance, end of period $ 28,471 $ 24,477 28,471 24,477
Other loans | Non-Covered Loans        
Valuation Allowance [Line Items]        
Provision for (recovery of) non-covered loan losses     $ 6,024 $ 3,306
[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.