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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | $ 220,831 | $ 298,997
Less than 12 months, unrealized losses | (1,396) | (4,387)
12 months or more, fair value | 72,730 | 30,592
12 months or more, unrealized losses | (2,172) | (1,327)
Fair value, total | 293,561 | 329,589
Unrealized losses, total | (3,568) | (5,714)
Agency-guaranteed residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 104,861 | 87,433
Less than 12 months, unrealized losses | (656) | (1,330)
12 months or more, fair value | 66,579 | 30,592
12 months or more, unrealized losses | (2,143) | (1,327)
Fair value, total | 171,440 | 118,025
Unrealized losses, total | (2,799) | (2,657)
Agency-guaranteed commercial real estate mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value | 115,970 | 201,817
Less than 12 months, unrealized losses | (740) | (2,872)
12 months or more, fair value | 6,151 | 0
12 months or more, unrealized losses | (29) | 0
Fair value, total | 122,121 | 201,817
Unrealized losses, total | $ (769) | (2,872)
Corporate notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months, fair value |  | 9,747
Less than 12 months, unrealized losses |  | (185)
12 months or more, fair value |  | 0
12 months or more, unrealized losses |  | 0
Fair value, total |  | 9,747
Unrealized losses, total |  | $ (185)

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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 that have been in a continuous loss position for less than twelve months. + 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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