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Held to Maturity Securities in Continuous Unrealized Loss Position (Detail) - USD ($) | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | $ 38,736,000
Less than 12 Months, Unrealized Losses | $ 0 | (88,000)
12 Months or Longer, Fair Value |  | 0
12 Months or Longer, Unrealized Losses | $ 0 | 0
Fair Value |  | 38,736,000
Unrealized Losses |  | (88,000)
U.S. Agency securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 28,188,000
Less than 12 Months, Unrealized Losses |  | (54,000)
12 Months or Longer, Fair Value |  | 0
12 Months or Longer, Unrealized Losses |  | 0
Fair Value |  | 28,188,000
Unrealized Losses |  | (54,000)
Corporate securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 10,548,000
Less than 12 Months, Unrealized Losses |  | (34,000)
12 Months or Longer, Fair Value |  | 0
12 Months or Longer, Unrealized Losses |  | 0
Fair Value |  | 10,548,000
Unrealized Losses |  | $ (34,000)

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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=27724398&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=27724398&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=27724398&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=27724398&loc=d3e27290-111563 + Details
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