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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)

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- 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. + Details
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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 + Details
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- 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 less than twelve months. + References No definition available. + Details
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