Deposits - Schedule of Additional Information Regarding the Bank's Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deposits
Aggregate amount of $100,000 or more	$ 4,407,608	$ 3,190,376
Aggregate amount of deposits in the New York Agency	1,250,524	526,474
Interest expense on deposits made in the New York Agency	$ 53,885	$ 12,334	$ 3,852

The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more.

No definition available.

Name:	blx_TimeDeposits100000OrMoreFromCustomer
Namespace Prefix:	blx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant