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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	$ 1,045,776	$ 220,831
Less Than 12 Months, Unrealized Losses	(45,123)	(1,396)
12 Months or More, Fair Value	66,409	72,730
12 Months or More, Unrealized Losses	(3,933)	(2,172)
Fair Value, Total	1,112,185	293,561
Unrealized Losses	(49,056)	(3,568)
Corporate notes
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	315,249
Less Than 12 Months, Unrealized Losses	(21,335)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Losses	0
Fair Value, Total	315,249
Unrealized Losses	(21,335)
Agency-guaranteed residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	416,002	104,861
Less Than 12 Months, Unrealized Losses	(10,256)	(656)
12 Months or More, Fair Value	60,561	66,579
12 Months or More, Unrealized Losses	(3,606)	(2,143)
Fair Value, Total	476,563	171,440
Unrealized Losses	(13,862)	(2,799)
Agency-guaranteed commercial real estate mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Less Than 12 Months, Fair Value	314,525	115,970
Less Than 12 Months, Unrealized Losses	(13,532)	(740)
12 Months or More, Fair Value	5,848	6,151
12 Months or More, Unrealized Losses	(327)	(29)
Fair Value, Total	320,373	122,121
Unrealized Losses	$ (13,859)	$ (769)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

No definition available.

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

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