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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Debt Securities, Available-for-sale [Line Items] |
Less Than 12 Months, Fair Value | $ 615,410
Less Than 12 Months, Unrealized Losses | (30,300)
12 Months or More, Fair Value | 0
12 Months or More, Unrealized Losses | 0
Fair Value, Total | 615,410
Unrealized Losses | (30,300)
Agency-guaranteed residential mortgage-backed securities |
Debt Securities, Available-for-sale [Line Items] |
Less Than 12 Months, Fair Value | 305,374
Less Than 12 Months, Unrealized Losses | (5,893)
12 Months or More, Fair Value | 0
12 Months or More, Unrealized Losses | 0
Fair Value, Total | 305,374
Unrealized Losses | (5,893)
Corporate notes |
Debt Securities, Available-for-sale [Line Items] |
Less Than 12 Months, Fair Value | 310,036
Less Than 12 Months, Unrealized Losses | (24,407)
12 Months or More, Fair Value | 0
12 Months or More, Unrealized Losses | 0
Fair Value, Total | 310,036
Unrealized Losses | $ (24,407)

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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, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + 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=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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