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Capital and Reserves - Common Stock and Additional Paid-In Capital (Details) - shares | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Number of shares authorized (in shares) | 280,000,000 |  |
Beginning balance (in shares) | 36,324,556 | 36,231,146 | 39,677,940
Conversion of shares (in shares) |  |  | 0
Repurchased common stock (in shares) |  |  | (3,558,093)
Restricted shares issued, directors (in shares) | 63,000 | 57,000 | 63,000
Restricted shares vested (in shares) | 152,305 | 36,410 | 48,299
Ending balance (in shares) | 36,539,861 | 36,324,556 | 36,231,146
“Class A” |  |  |
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Number of shares authorized (in shares) | 40,000,000 |  |
Beginning balance (in shares) | 6,342,189 | 6,342,189 | 6,342,189
Conversion of shares (in shares) |  |  | 0
Repurchased common stock (in shares) |  |  | 0
Restricted shares issued, directors (in shares) | 0 | 0 | 0
Restricted shares vested (in shares) | 0 | 0 | 0
Ending balance (in shares) | 6,342,189 | 6,342,189 | 6,342,189
“Class B” |  |  |
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Number of shares authorized (in shares) | 40,000,000 |  |
Beginning balance (in shares) | 2,089,075 | 2,089,075 | 2,178,365
Conversion of shares (in shares) |  |  | (89,290)
Repurchased common stock (in shares) |  |  | 0
Restricted shares issued, directors (in shares) | 0 | 0 | 0
Restricted shares vested (in shares) | 0 | 0 | 0
Ending balance (in shares) | 2,089,075 | 2,089,075 | 2,089,075
“Class E” |  |  |
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Number of shares authorized (in shares) | 100,000,000 |  |
Beginning balance (in shares) | 27,893,292 | 27,799,882 | 31,157,386
Conversion of shares (in shares) |  |  | 89,290
Repurchased common stock (in shares) |  |  | (3,558,093)
Restricted shares issued, directors (in shares) | 63,000 | 57,000 | 63,000
Restricted shares vested (in shares) | 152,305 | 36,410 | 48,299
Ending balance (in shares) | 28,108,597 | 27,893,292 | 27,799,882
“Class F” |  |  |
Disclosure of share capital, reserves and other equity interest [Line Items] |  |  |
Number of shares authorized (in shares) | 100,000,000 |  |
Beginning balance (in shares) | 0 | 0 | 0
Conversion of shares (in shares) |  |  | 0
Repurchased common stock (in shares) |  |  | 0
Restricted shares issued, directors (in shares) | 0 | 0 | 0
Restricted shares vested (in shares) | 0 | 0 | 0
Ending balance (in shares) | 0 | 0 | 0

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- Definition The number of shares converted. + References No definition available. + Details
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Namespace Prefix: | blx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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- Definition The repurchase of ordinary shares. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The restricted shares issued to directors. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition The vested restricted shares. + References No definition available. + Details
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- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_i&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2023-03-23 + Details
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- Details
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