Fair value of financial instruments - Carrying value and an estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Fair value of financial instruments [Line Items]
Cash and deposits in banks	$ 1,241,586	$ 1,253,052	$ 863,812
Loans at amortized cost, net	6,760,434	5,713,022
Customers' liabilities under acceptances	163,345	201,515
Investment property		0	3,214
Deposits	3,205,386	3,037,457
Securities sold under repurchase agreements	300,498	427,497
Borrowings and debt, net	4,416,511	3,304,178	$ 1,966,271	$ 3,118,396
Acceptances outstanding	163,345	201,515
Not measured at fair value in statement of financial position but for which fair value is disclosed
Disclosure of Fair value of financial instruments [Line Items]
Cash and deposits in banks	1,241,586	1,253,052
Securities at amortized cost	945,260	637,422
Loans at amortized cost, net	6,760,434	5,707,709
Customers' liabilities under acceptances	163,345	201,515
Deposits	3,205,386	3,037,457
Securities sold under repurchase agreements	300,498	427,497
Borrowings and debt, net	4,416,511	3,304,178
Acceptances outstanding	163,345	201,515
At fair value [member]
Disclosure of Fair value of financial instruments [Line Items]
Cash and deposits in banks	1,241,586	1,253,052
Securities at amortized cost	895,154	632,848
Loans at amortized cost, net	6,785,652	5,806,915
Customers' liabilities under acceptances	163,345	201,515
Deposits	3,205,386	3,037,457
Securities sold under repurchase agreements	300,498	427,497
Borrowings and debt, net	4,389,902	3,294,135
Acceptances outstanding	163,345	201,515
Level 1 \| Not measured at fair value in statement of financial position but for which fair value is disclosed
Disclosure of Fair value of financial instruments [Line Items]
Cash and deposits in banks	0	0
Securities at amortized cost	0	0
Loans at amortized cost, net	0	0
Customers' liabilities under acceptances	0	0
Deposits	0	0
Securities sold under repurchase agreements	0	0
Borrowings and debt, net	0	0
Acceptances outstanding	0	0
Level 2 \| Not measured at fair value in statement of financial position but for which fair value is disclosed
Disclosure of Fair value of financial instruments [Line Items]
Cash and deposits in banks	1,241,586	1,253,052
Securities at amortized cost	894,034	628,284
Loans at amortized cost, net	6,785,652	5,806,915
Customers' liabilities under acceptances	163,345	201,515
Deposits	3,205,386	3,037,457
Securities sold under repurchase agreements	300,498	427,497
Borrowings and debt, net	4,389,902	3,294,135
Acceptances outstanding	163,345	201,515
Level 3 \| Not measured at fair value in statement of financial position but for which fair value is disclosed
Disclosure of Fair value of financial instruments [Line Items]
Cash and deposits in banks	0	0
Securities at amortized cost	1,120	4,564
Loans at amortized cost, net	0	0
Customers' liabilities under acceptances	0	0
Deposits	0	0
Securities sold under repurchase agreements	0	0
Borrowings and debt, net	0	0
Acceptances outstanding	$ 0	$ 0

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Amounts receivable from customers on short-term negotiable time drafts drawn on and accepted by the institution (also known as banker's acceptance transactions) that are outstanding on the reporting date.

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- Definition

The amount of outstanding funds that the entity is obligated to repay.

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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]

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The amount of deposit liabilities from customers held by the entity.

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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]

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The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business.

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The amount of loans and advances the entity has made to customers.

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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]

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