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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Valuation Allowance [Line Items]    
Balance, beginning of period $ 147,638 $ 159,820
Impact of CECL adoption 1,911  
Charge-offs (10,385) (2,079)
Recoveries 189 117
(Recovery of) provision for loan losses 20,601 (1,222)
Balance, end of period 162,244 156,636
Non-Covered Loans    
Valuation Allowance [Line Items]    
(Recovery of) provision for loan losses 22,891 (1,222)
Mortgage Receivable    
Valuation Allowance [Line Items]    
Balance, beginning of period 122,695 130,983
Impact of CECL adoption (178)  
Recoveries 11 7
Balance, end of period 141,314 128,766
Mortgage Receivable | Non-Covered Loans    
Valuation Allowance [Line Items]    
(Recovery of) provision for loan losses 18,786 (2,224)
Other loans    
Valuation Allowance [Line Items]    
Balance, beginning of period 24,943 28,837
Impact of CECL adoption 2,089  
Charge-offs (10,385) (2,079)
Recoveries 178 110
Balance, end of period 20,930 27,870
Other loans | Non-Covered Loans    
Valuation Allowance [Line Items]    
(Recovery of) provision for loan losses $ 4,105 $ 1,002