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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Valuation Allowance [Line Items]      
Balance, beginning of period $ 158,046 $ 158,290  
Charge-offs (18,342) (63,350)  
Recoveries 1,860 2,163  
Balance, end of period 159,820 158,046 $ 158,290
Non-Covered Loans      
Valuation Allowance [Line Items]      
Provision for non-covered loan losses 18,256 60,943 11,874
Mortgage Receivable      
Valuation Allowance [Line Items]      
Balance, beginning of period 128,275 125,416  
Charge-offs (5,445) (375)  
Recoveries 264 605  
Balance, end of period 130,983 128,275 125,416
Mortgage Receivable | Non-Covered Loans      
Valuation Allowance [Line Items]      
Provision for non-covered loan losses 7,889 2,629  
Other loans      
Valuation Allowance [Line Items]      
Balance, beginning of period 29,771 32,874  
Charge-offs (12,897) (62,975)  
Recoveries 1,596 1,558  
Balance, end of period 28,837 29,771 $ 32,874
Other loans | Non-Covered Loans      
Valuation Allowance [Line Items]      
Provision for non-covered loan losses $ 10,367 $ 58,314