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Held to Maturity Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value	$ 13,749	$ 50,574
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(8)	(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	13,749	50,574
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(8)	(129)
U.S. Agency securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value	13,749	43,723
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(8)	(106)
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	13,749	43,723
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	$ (8)	(106)
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value		6,851
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses		(23)
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		6,851
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		$ (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=27724398&loc=d3e27232-111563

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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

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+ 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

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+ 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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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