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Investment securities (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Less than Twelve Months, Fair Value	$ 244,134	$ 10,188
Available-for-sale Securities, Twelve Months or Longer, Fair Value	25,423	10,009
Available-for-sale Securities, Fair Value	269,557	20,197
Available-for-sale Securities, Less than Twelve Months, Unrealized Gross Losses	10,323	79
Available-for-sale Securities, Twelve Months or Longer, Unrealized Gross Losses	880	153
Available-for-sale Securities, Unrealized Gross Losses	11,203	232
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Less than Twelve Months, Fair Value	136,895
Available-for-sale Securities, Twelve Months or Longer, Fair Value	6,866
Available-for-sale Securities, Fair Value	143,761
Available-for-sale Securities, Less than Twelve Months, Unrealized Gross Losses	5,113
Available-for-sale Securities, Twelve Months or Longer, Unrealized Gross Losses	503
Available-for-sale Securities, Unrealized Gross Losses	5,616
Sovereign Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Less than Twelve Months, Fair Value	107,239	10,188
Available-for-sale Securities, Twelve Months or Longer, Fair Value	18,557	10,009
Available-for-sale Securities, Fair Value	125,796	20,197
Available-for-sale Securities, Less than Twelve Months, Unrealized Gross Losses	5,210	79
Available-for-sale Securities, Twelve Months or Longer, Unrealized Gross Losses	377	153
Available-for-sale Securities, Unrealized Gross Losses	$ 5,587	$ 232

X

- Definition

Amount of unrealized loss on securities classified as available-for-sale that have been in a 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=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 6

-Subparagraph (a)(2)

-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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+ 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

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-Publisher FASB

-Name Accounting Standards Codification

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-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

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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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