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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Valuation Allowance [Line Items]      
Balance, beginning of period $ 159,820 $ 158,046  
Charge-offs (20,307) (18,342)  
Recoveries 1,020 1,860  
Balance, end of period 147,638 159,820 $ 158,046
Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for loan losses 7,105 18,256 60,943
Mortgage Receivable      
Valuation Allowance [Line Items]      
Balance, beginning of period 130,983 128,275  
Charge-offs (1,613) (5,445)  
Recoveries 61 264  
Balance, end of period 122,694 130,983 128,275
Mortgage Receivable | Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for loan losses (6,737) 7,889  
Other loans      
Valuation Allowance [Line Items]      
Balance, beginning of period 28,837 29,771  
Charge-offs (18,694) (12,897)  
Recoveries 959 1,596  
Balance, end of period 24,944 28,837 $ 29,771
Other loans | Non-Covered Loans      
Valuation Allowance [Line Items]      
(Recovery of) provision for loan losses $ 13,842 $ 10,367