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Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Valuation Allowance [Line Items]
Balance, beginning of period			$ 158,046	$ 158,290
Charge-offs			(15,150)	(58,578)
Recoveries			1,273	1,189
Balance, end of period	$ 159,655	$ 158,918	159,655	158,918
Non-Covered Loans
Valuation Allowance [Line Items]
Provision for (recovery of) non-covered loan losses	1,201	44,585	15,486	58,017
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period			128,275	125,416
Charge-offs			(5,445)	(375)
Recoveries			242	595
Balance, end of period	128,816	122,522	128,816	122,522
Mortgage Receivable | Non-Covered Loans
Valuation Allowance [Line Items]
Provision for (recovery of) non-covered loan losses			5,744	(3,114)
Other loans
Valuation Allowance [Line Items]
Balance, beginning of period			29,771	32,874
Charge-offs			(9,705)	(58,203)
Recoveries			1,031	594
Balance, end of period	$ 30,839	$ 36,396	30,839	36,396
Other loans | Non-Covered Loans
Valuation Allowance [Line Items]
Provision for (recovery of) non-covered loan losses			$ 9,742	$ 61,131

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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Amount of direct write-downs of financing receivables charged against the allowance.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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