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Fair value of financial instruments - Carrying value and an estimated fair value (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Cash and deposits on banks | $ 863,812 | $ 1,178,170 |  |
Securities at amortized cost (1) | 165,564 | 75,271 |  |
Loans at amortized cost, net (2) | 4,896,647 | 5,823,333 |  |
Customers' liabilities under acceptances | 74,366 | 115,682 |  |
Investment properties | 3,214 | 3,494 |  |
Deposits | 3,140,875 | 2,893,555 |  |
Securities sold under repurchase agreements | 10,663 | 40,530 |  |
Borrowings and debt, net (3) | 1,985,070 | 3,138,310 | $ 3,518,446 | $ 2,211,567
Acceptance outstanding | 74,366 | 115,682 |  |
Not measured at fair value in statement of financial position but for which fair value is disclosed [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Cash and deposits on banks | 863,812 | 1,178,170 |  |
Securities at amortized cost (1) | 165,564 | 75,271 |  |
Loans at amortized cost, net (2) | 4,891,698 | 5,823,333 |  |
Customers' liabilities under acceptances | 74,366 | 115,682 |  |
Investment properties | 3,214 | 3,494 |  |
Deposits | 3,140,875 | 2,893,555 |  |
Securities sold under repurchase agreements | 10,663 | 40,530 |  |
Borrowings and debt, net (3) | 1,966,271 | 3,118,396 |  |
Acceptance outstanding | 74,366 | 115,682 |  |
At fair value [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Cash and deposits on banks | 863,812 | 1,178,170 |  |
Securities at amortized cost (1) | 168,110 | 75,724 |  |
Loans at amortized cost, net (2) | 4,972,599 | 6,162,885 |  |
Customers' liabilities under acceptances | 74,366 | 115,682 |  |
Investment properties | 3,214 | 3,494 |  |
Deposits | 3,140,875 | 2,893,555 |  |
Securities sold under repurchase agreements | 10,663 | 40,530 |  |
Borrowings and debt, net (3) | 1,989,719 | 3,126,333 |  |
Acceptance outstanding | 74,366 | 115,682 |  |
Level 1 of fair value hierarchy [member] | Not measured at fair value in statement of financial position but for which fair value is disclosed [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Cash and deposits on banks | 0 | 0 |  |
Securities at amortized cost (1) | 0 | 0 |  |
Loans at amortized cost, net (2) | 0 | 0 |  |
Deposits | 0 | 0 |  |
Level 1 of fair value hierarchy [member] | At fair value [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Customers' liabilities under acceptances | 0 | 0 |  |
Investment properties | 0 | 0 |  |
Securities sold under repurchase agreements | 0 | 0 |  |
Borrowings and debt, net (3) | 0 | 0 |  |
Acceptance outstanding | 0 | 0 |  |
Level 2 of fair value hierarchy [member] | Not measured at fair value in statement of financial position but for which fair value is disclosed [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Cash and deposits on banks | 863,812 | 1,178,170 |  |
Securities at amortized cost (1) | 157,698 | 56,914 |  |
Loans at amortized cost, net (2) | 4,972,599 | 6,101,040 |  |
Deposits | 3,140,875 | 2,893,555 |  |
Level 2 of fair value hierarchy [member] | At fair value [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Customers' liabilities under acceptances | 74,366 | 115,682 |  |
Securities sold under repurchase agreements | 10,663 | 40,530 |  |
Borrowings and debt, net (3) | 1,989,719 | 3,126,333 |  |
Acceptance outstanding | 74,366 | 115,682 |  |
Level 3 | Not measured at fair value in statement of financial position but for which fair value is disclosed [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Cash and deposits on banks | 0 | 0 |  |
Securities at amortized cost (1) | 10,412 | 18,810 |  |
Loans at amortized cost, net (2) | 0 | 61,845 |  |
Deposits | 0 | 0 |  |
Level 3 | At fair value [member] |  |  |  |
Disclosure of Fair value of financial instruments [Line Items] |  |  |  |
Customers' liabilities under acceptances | 0 | 0 |  |
Investment properties | 3,214 | 3,494 |  |
Securities sold under repurchase agreements | 0 | 0 |  |
Borrowings and debt, net (3) | 0 | 0 |  |
Acceptance outstanding | $ 0 | $ 0 |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of financial assets at amortised cost. The amortised cost is the amount at which financial assets are measured at initial recognition minus principal repayments, plus or minus the cumulative amortisation using the effective interest method of any difference between that initial amount and the maturity amount, and adjusted for any impairment. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_8_f&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of non-derivative financial assets with fixed or determinable payments that are not quoted in an active market, other than: (a) those that the entity intends to sell immediately or in the near term, which shall be classified as held for trading, and those that the entity, upon initial recognition, designates as at fair value through profit or loss; (b) those that the entity, upon initial recognition, designates as available for sale; or (c) those for which the holder may not recover substantially all of its initial investment, other than because of credit deterioration, which shall be classified as available for sale. An interest acquired in a pool of assets that are not loans or receivables (for example, an interest in a mutual fund or a similar fund) is not a loan or receivable. [Refer: Derivative financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 8 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_8_c&doctype=Standard&book=b -URIDate 2020-01-01 + Details
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