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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | $ 626,721 | $ 220,831
Less Than 12 Months, Unrealized Losses | (31,575) | (1,396)
12 Months or More, Fair Value | 0 | 72,730
12 Months or More, Unrealized Losses | 0 | (2,172)
Fair Value, Total | 626,721 | 293,561
Unrealized Losses | (31,575) | (3,568)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 321,303 |
Less Than 12 Months, Unrealized Losses | (20,208) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Fair Value, Total | 321,303 |
Unrealized Losses | (20,208) |
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value | 305,418 | 104,861
Less Than 12 Months, Unrealized Losses | (11,367) | (656)
12 Months or More, Fair Value | 0 | 66,579
12 Months or More, Unrealized Losses | 0 | (2,143)
Fair Value, Total | 305,418 | 171,440
Unrealized Losses | $ (11,367) | (2,799)
Agency-guaranteed commercial real estate mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less Than 12 Months, Fair Value |  | 115,970
Less Than 12 Months, Unrealized Losses |  | (740)
12 Months or More, Fair Value |  | 6,151
12 Months or More, Unrealized Losses |  | (29)
Fair Value, Total |  | 122,121
Unrealized Losses |  | $ (769)

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- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value + References No definition available. + Details
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- Definition Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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