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Fair value of financial instruments (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of Fair value of financial instruments [Line Items] |  |  |
Allowance for expected credit losses | $ 81,294 | $ 105,988 | $ 89,974
Unearned interest and deferred fees | (4,985) | (7,249) |
Securities [Member] |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |
Allowance for expected credit losses | $ 196 | $ 602 |

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- Definition The amount of unearned interest and deferred fees. + References No definition available. + Details
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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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