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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Valuation Allowance [Line Items]
Balance, beginning of period	$ 159,820	$ 158,046
Charge-offs	(2,079)	(6,991)
Recoveries	117	514
(Recovery of) provision for loan losses	(1,222)	9,571
Balance, end of period	156,636	161,140
Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses	(1,222)	9,571
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period	130,983	128,275
Charge-offs		(5,411)
Recoveries	7	110
Balance, end of period	128,766	129,135
Mortgage Receivable | Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses	(2,224)	6,161
Other loans
Valuation Allowance [Line Items]
Balance, beginning of period	28,837	29,771
Charge-offs	(2,079)	(1,580)
Recoveries	110	404
Balance, end of period	27,870	32,005
Other loans | Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses	$ 1,002	$ 3,410

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- Definition

Provision Recoveries For Loan Losses

+ References

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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