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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Valuation Allowance [Line Items]
Balance, beginning of period			$ 159,820	$ 158,046
Charge-offs			(16,396)	(15,150)
Recoveries			606	1,273
(Recovery of) provision for loan losses	$ 4,781	$ 1,201	5,403	15,486
Balance, end of period	149,433	159,655	149,433	159,655
Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses			5,403	15,486
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period			130,983	128,275
Charge-offs			(1,386)	(5,445)
Recoveries			43	242
Balance, end of period	122,967	128,816	122,967	128,816
Mortgage Receivable | Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses			(6,673)	5,744
Other loans
Valuation Allowance [Line Items]
Balance, beginning of period			28,837	29,771
Charge-offs			(15,010)	(9,705)
Recoveries			563	1,031
Balance, end of period	$ 26,466	$ 30,839	26,466	30,839
Other loans | Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses			$ 12,076	$ 9,742

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