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Activity in Allowance for Losses on Non-Covered Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Valuation Allowance [Line Items]
Balance, beginning of period			$ 159,820	$ 158,046
Charge-offs			(9,830)	(12,848)
Recoveries			500	1,169
(Recovery of) provision for loan losses	$ 1,844	$ 4,714	622	14,285
Balance, end of period	151,112	160,652	151,112	160,652
Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses			622	14,285
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period			130,983	128,275
Charge-offs				(5,444)
Recoveries			22	229
Balance, end of period	122,088	129,697	122,088	129,697
Mortgage Receivable | Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses			(8,917)	6,637
Other loans
Valuation Allowance [Line Items]
Balance, beginning of period			28,837	29,771
Charge-offs			(9,830)	(7,404)
Recoveries			478	940
Balance, end of period	$ 29,024	$ 30,955	29,024	30,955
Other loans | Non-Covered Loans
Valuation Allowance [Line Items]
(Recovery of) provision for loan losses			$ 9,539	$ 7,648

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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
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-SubTopic 210
-Section S99
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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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