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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | $ 1,058,971 | $ 220,831
Less Than 12 Months, Unrealized Losses | (33,042) | (1,396)
12 Months or More, Fair Value | 68,421 | 72,730
12 Months or More, Unrealized Losses | (3,973) | (2,172)
Fair Value, Total | 1,127,392 | 293,561
Unrealized Losses | (37,015) | (3,568)
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 309,601 |
Less Than 12 Months, Unrealized Losses | (15,050) |
12 Months or More, Fair Value | 0 |
12 Months or More, Unrealized Losses | 0 |
Fair Value, Total | 309,601 |
Unrealized Losses | (15,050) |
Agency-guaranteed residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 430,735 | 104,861
Less Than 12 Months, Unrealized Losses | (8,161) | (656)
12 Months or More, Fair Value | 62,522 | 66,579
12 Months or More, Unrealized Losses | (3,695) | (2,143)
Fair Value, Total | 493,257 | 171,440
Unrealized Losses | (11,856) | (2,799)
Agency-guaranteed commercial real estate mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less Than 12 Months, Fair Value | 318,635 | 115,970
Less Than 12 Months, Unrealized Losses | (9,831) | (740)
12 Months or More, Fair Value | 5,899 | 6,151
12 Months or More, Unrealized Losses | (278) | (29)
Fair Value, Total | 324,534 | 122,121
Unrealized Losses | $ (10,109) | $ (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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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