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Held to Maturity Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value	$ 50,574	$ 38,736
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(129)	(88)
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	50,574	38,736
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(129)	(88)
U.S. Agency securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value	43,723	28,188
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(106)	(54)
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	43,723	28,188
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(106)	(54)
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Less than 12 Months, Fair Value	6,851	10,548
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses	(23)	(34)
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	6,851	10,548
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	$ (23)	$ (34)

X

- 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
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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
-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
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-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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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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