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Fair value of financial instruments (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | ---
Trading assets | $ 5,265 |  | $ 20,436 |  |
Securities available-for-sale | 183,017 |  | 416,300 |  |
Investment fund | 105,888 |  | 120,425 |  |
Derivative financial instruments used for hedging - receivable | 19,239 | [1] | 4,159 | [1] | 2,103
Assets, Fair Value Disclosure, Recurring | 313,409 |  | 561,320 |  |
Trading liabilities | 32,304 |  | 5,584 |  |
Derivative financial instruments used for hedging - payable | 11,747 | [1] | 53,742 | [1] |
Liabilities, Fair Value Disclosure | 44,051 |  | 59,326 |  |
Sovereign Debt [Member] |  |  |  |  |
Trading assets | 5,146 |  | 20,415 |  |
Securities available-for-sale | 165,631 |  | 329,102 |  |
Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Trading assets |  |  | 21 |  |
Derivative financial instruments used for hedging - receivable | 10,858 |  | 3,605 |  |
Trading liabilities | 32,182 |  | 4,836 |  |
Derivative financial instruments used for hedging - payable | 4,688 |  | 40,574 |  |
Corporate Debt Securities [Member] |  |  |  |  |
Securities available-for-sale | 17,386 |  | 87,198 |  |
Interest Rate Swap [Member] |  |  |  |  |
Trading assets | 49 |  |  |  |
Derivative financial instruments used for hedging - receivable | 8,319 |  | 16 |  |
Trading liabilities | 100 |  | 748 |  |
Derivative financial instruments used for hedging - payable | 6,600 |  | 10,829 |  |
Foreign Exchange Forward [Member] |  |  |  |  |
Trading assets | 50 |  |  |  |
Derivative financial instruments used for hedging - receivable | 62 |  | 538 |  |
Trading liabilities | 22 |  |  |  |
Derivative financial instruments used for hedging - payable | 459 |  | 2,339 |  |
Future [Member] |  |  |  |  |
Trading assets | 20 |  |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Trading assets | 5,215 |  | 20,415 |  |
Securities available-for-sale | 182,741 |  | 415,742 |  |
Investment fund | 0 |  | 0 |  |
Derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Assets, Fair Value Disclosure, Recurring | 187,956 |  | 436,157 |  |
Trading liabilities | 0 |  | 0 |  |
Derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Liabilities, Fair Value Disclosure | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Sovereign Debt [Member] |  |  |  |  |
Trading assets | 5,146 |  | 20,415 |  |
Securities available-for-sale | 165,355 |  | 328,544 |  |
Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Trading assets |  |  | 0 |  |
Derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Trading liabilities | 0 |  | 0 |  |
Derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Securities available-for-sale | 17,386 |  | 87,198 |  |
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Trading assets | 49 |  |  |  |
Derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Trading liabilities | 0 |  | 0 |  |
Derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Trading assets | 0 |  |  |  |
Derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Trading liabilities | 0 |  |  |  |
Derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 1 [Member] | Future [Member] |  |  |  |  |
Trading assets | 20 |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Trading assets | 50 |  | 21 |  |
Securities available-for-sale | 276 |  | 558 |  |
Investment fund | 105,888 |  | 120,425 |  |
Derivative financial instruments used for hedging - receivable | 19,239 |  | 4,159 |  |
Assets, Fair Value Disclosure, Recurring | 125,453 |  | 125,163 |  |
Trading liabilities | 32,304 |  | 5,584 |  |
Derivative financial instruments used for hedging - payable | 11,747 |  | 53,742 |  |
Liabilities, Fair Value Disclosure | 44,051 |  | 59,326 |  |
Fair Value, Inputs, Level 2 [Member] | Sovereign Debt [Member] |  |  |  |  |
Trading assets | 0 |  | 0 |  |
Securities available-for-sale | 276 |  | 558 |  |
Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Trading assets |  |  | 21 |  |
Derivative financial instruments used for hedging - receivable | 10,858 |  | 3,605 |  |
Trading liabilities | 32,182 |  | 4,836 |  |
Derivative financial instruments used for hedging - payable | 4,689 |  | 40,574 |  |
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Securities available-for-sale | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Trading assets | 0 |  |  |  |
Derivative financial instruments used for hedging - receivable | 8,319 |  | 16 |  |
Trading liabilities | 100 |  | 748 |  |
Derivative financial instruments used for hedging - payable | 6,600 |  | 10,829 |  |
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Trading assets | 50 |  |  |  |
Derivative financial instruments used for hedging - receivable | 62 |  | 538 |  |
Trading liabilities | 22 |  |  |  |
Derivative financial instruments used for hedging - payable | 459 |  | 2,339 |  |
Fair Value, Inputs, Level 2 [Member] | Future [Member] |  |  |  |  |
Trading assets | 0 |  |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Trading assets | 0 |  | 0 |  |
Securities available-for-sale | 0 |  | 0 |  |
Investment fund | 0 |  | 0 |  |
Derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Assets, Fair Value Disclosure, Recurring | 0 |  | 0 |  |
Trading liabilities | 0 |  | 0 |  |
Derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Liabilities, Fair Value Disclosure | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Sovereign Debt [Member] |  |  |  |  |
Trading assets | 0 |  | 0 |  |
Securities available-for-sale | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |  |  |  |  |
Securities available-for-sale | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member] |  |  |  |  |
Trading assets | 0 |  |  |  |
Derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Trading liabilities | 0 |  | 0 |  |
Derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Trading assets | 0 |  |  |  |
Derivative financial instruments used for hedging - receivable | 0 |  | 0 |  |
Trading liabilities | 0 |  |  |  |
Derivative financial instruments used for hedging - payable | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Future [Member] |  |  |  |  |
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 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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: 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=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. + References Reference 1: 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 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 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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