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Investment securities (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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

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- 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 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + 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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- Definition Amount of unrealized loss on investments in available-for-sale securities that have been in a 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=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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