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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Valuation Allowance [Line Items]
Balance, beginning of period			$ 158,290	$ 147,124
Charge-offs			(17,736)	(1,251)
Recoveries			697	1,721
Provision for loan losses	$ (6,261)	$ 895	(10,269)	719
Balance, end of period	154,683	153,059	154,683	153,059
Non-Covered Loans
Valuation Allowance [Line Items]
Provision for loan losses	11,645	2,744	13,432	5,465
Mortgage Receivable
Valuation Allowance [Line Items]
Balance, beginning of period			125,416	124,478
Charge-offs			(90)	(153)
Recoveries			180	1,140
Balance, end of period	121,721	128,696	121,721	128,696
Mortgage Receivable | Non-Covered Loans
Valuation Allowance [Line Items]
Provision for loan losses			(3,785)	3,231
Other loans
Valuation Allowance [Line Items]
Balance, beginning of period			32,874	22,646
Charge-offs			(17,646)	(1,098)
Recoveries			517	581
Balance, end of period	$ 32,962	$ 24,363	32,962	24,363
Other loans | Non-Covered Loans
Valuation Allowance [Line Items]
Provision for loan losses			$ 17,217	$ 2,234

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Provision Recoveries For Loan Losses

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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