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Fair value of financial instruments (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets | $ 0 |  | $ 5,265 |  |
Total securities available-for-sale | 334,368 |  | 183,017 |  |
Investment funds | 118,661 |  | 105,888 |  |
Total derivative financial instruments used for hedging - receivable | 15,217 | [1] | 19,239 | [1] | 4,159
Total assets at fair value | 468,246 |  | 313,409 |  |
Total trading liabilities | 72 |  | 32,304 |  |
Total derivative financial instruments used for hedging - payable | 8,572 | [1] | 11,747 | [1] |
Total liabilities at fair value | 8,644 |  | 44,051 |  |
Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 5,146 |  |
Total securities available-for-sale | 156,200 |  | 165,631 |  |
Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 49 |  |
Total derivative financial instruments used for hedging - receivable | 9,175 |  | 10,858 |  |
Total trading liabilities | 7 |  | 32,182 |  |
Total derivative financial instruments used for hedging - payable | 6,834 |  | 4,688 |  |
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total securities available-for-sale | 178,168 |  | 17,386 |  |
Interest Rate Swap [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total derivative financial instruments used for hedging - receivable | 5,018 |  | 8,319 |  |
Total trading liabilities | 65 |  | 100 |  |
Total derivative financial instruments used for hedging - payable | 1,646 |  | 6,600 |  |
Foreign Exchange Forward [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 50 |  |
Total derivative financial instruments used for hedging - receivable | 1,024 |  | 62 |  |
Total trading liabilities |  |  | 22 |  |
Total derivative financial instruments used for hedging - payable | 92 |  | 459 |  |
Future [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 20 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 5,215 |  |
Total securities available-for-sale | 334,368 |  | 182,741 |  |
Investment funds | 0 |  | 0 |  |
Total derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Total assets at fair value | 334,368 |  | 187,956 |  |
Total trading liabilities | 0 |  | 0 |  |
Total derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Total liabilities at fair value | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 5,146 |  |
Total securities available-for-sale | 156,200 |  | 165,355 |  |
Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 49 |  |
Total derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Total trading liabilities | 0 |  | 0 |  |
Total derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total securities available-for-sale | 178,168 |  | 17,386 |  |
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Total trading liabilities | 0 |  | 0 |  |
Total derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 0 |  |
Total derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Total trading liabilities |  |  | 0 |  |
Total derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Future [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 20 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 50 |  |
Total securities available-for-sale | 0 |  | 276 |  |
Investment funds | 118,661 |  | 105,888 |  |
Total derivative financial instruments used for hedging - receivable | 15,217 |  | 19,239 |  |
Total assets at fair value | 133,878 |  | 125,453 |  |
Total trading liabilities | 72 |  | 32,304 |  |
Total derivative financial instruments used for hedging - payable | 8,572 |  | 11,747 |  |
Total liabilities at fair value | 8,644 |  | 44,051 |  |
Fair Value, Inputs, Level 2 [Member] | Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 0 |  |
Total securities available-for-sale | 0 |  | 276 |  |
Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 0 |  |
Total derivative financial instruments used for hedging - receivable | 9,175 |  | 10,858 |  |
Total trading liabilities | 7 |  | 32,182 |  |
Total derivative financial instruments used for hedging - payable | 6,834 |  | 4,688 |  |
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total securities available-for-sale | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total derivative financial instruments used for hedging - receivable | 5,018 |  | 8,319 |  |
Total trading liabilities | 65 |  | 100 |  |
Total derivative financial instruments used for hedging - payable | 1,646 |  | 6,600 |  |
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 50 |  |
Total derivative financial instruments used for hedging - receivable | 1,024 |  | 62 |  |
Total trading liabilities |  |  | 22 |  |
Total derivative financial instruments used for hedging - payable | 92 |  | 459 |  |
Fair Value, Inputs, Level 2 [Member] | Future [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 0 |  |
Total securities available-for-sale | 0 |  | 0 |  |
Investment funds | 0 |  | 0 |  |
Total derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Total assets at fair value | 0 |  | 0 |  |
Total trading liabilities | 0 |  | 0 |  |
Total derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Total liabilities at fair value | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Sovereign Debt [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 0 |  |
Total securities available-for-sale | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 0 |  |
Total derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Total trading liabilities | 0 |  | 0 |  |
Total derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total securities available-for-sale | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Total trading liabilities | 0 |  | 0 |  |
Total derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | 0 |  |
Total derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Total trading liabilities |  |  | 0 |  |
Total derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Future [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total trading assets |  |  | $ 0 |  |
[1] | The fair value of assets and liabilities is reported within the derivative financial instruments used for hedging - receivable and payable lines in the consolidated balance sheets, respectively.

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Carrying amount as of the balance sheet date of the asset arising from derivative instruments and hedging activities, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Other investments not otherwise specified in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f,g)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The carrying amount of liabilities as of the balance sheet date that pertain to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include short positions in securities, derivatives and commodities, obligations under repurchase agreements, and securities borrowed arrangements. + References No definition available. + Details
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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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