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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Valuation Allowance [Line Items]        
Balance, beginning of period     $ 147,124 $ 139,857
Charge-offs     (1,251) (1,030)
Recoveries     1,721 2,847
Transfer from the allowance for losses on covered loans [1]       2,416
Provision for (recovery of) non-covered loan losses $ 895 $ 334 719 341
Balance, end of period 153,059 141,348 153,059 141,348
Non-Covered Loans        
Valuation Allowance [Line Items]        
Provision for (recovery of) non-covered loan losses 2,744 (1,872) 5,465 (2,742)
Mortgage Receivable        
Valuation Allowance [Line Items]        
Balance, beginning of period     124,478 122,616
Charge-offs     (153) (655)
Recoveries     1,140 1,640
Transfer from the allowance for losses on covered loans [1]       2,250
Balance, end of period 128,696 117,695 128,696 117,695
Mortgage Receivable | Non-Covered Loans        
Valuation Allowance [Line Items]        
Provision for (recovery of) non-covered loan losses     3,231 (8,156)
Other loans        
Valuation Allowance [Line Items]        
Balance, beginning of period     22,646 17,241
Charge-offs     (1,098) (375)
Recoveries     581 1,207
Transfer from the allowance for losses on covered loans [1]       166
Balance, end of period $ 24,363 $ 23,653 24,363 23,653
Other loans | Non-Covered Loans        
Valuation Allowance [Line Items]        
Provision for (recovery of) non-covered loan losses     $ 2,234 $ 5,414
[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.