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Held to Maturity Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | $ 3,533 | $ 50,574
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | (2) | (129)
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 0 | 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 3,533 | 50,574
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (2) | (129)
U.S. Agency securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value |  | 43,723
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses |  | (106)
Held-to-maturity Securities, 12 Months or Longer, Fair Value |  | 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses |  | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value |  | 43,723
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss |  | (106)
Corporate securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 3,533 | 6,851
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | (2) | (23)
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 0 | 0
Held-to-maturity Securities, 12 Months or Longer, Unrealized Losses | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 3,533 | 6,851
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | $ (2) | $ (23)

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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity 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 7 -URI http://asc.fasb.org/extlink&oid=73527792&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=73527792&loc=d3e27290-111563 + Details
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- Definition This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized 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 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity 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 7 -URI http://asc.fasb.org/extlink&oid=73527792&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=73527792&loc=d3e27290-111563 + Details
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