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Loans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Proceeds from Sale of Loans Receivable	$ 515,600,000us-gaap_ProceedsFromSaleOfLoansReceivable	$ 89,500,000us-gaap_ProceedsFromSaleOfLoansReceivable	$ 146,200,000us-gaap_ProceedsFromSaleOfLoansReceivable
Net gain on sale of loans	$ 2,546,000us-gaap_GainLossOnSalesOfLoansNet	$ 588,000us-gaap_GainLossOnSalesOfLoansNet	$ 1,147,000us-gaap_GainLossOnSalesOfLoansNet
Percentage Of Loan Portfolio At Fixed Interest Rate	89.00%blx_PercentageOfLoanPortfolioAtFixedInterestRateWithMaturitiesOfLessThan180Days	92.00%blx_PercentageOfLoanPortfolioAtFixedInterestRateWithMaturitiesOfLessThan180Days
Class "A" and "B"
Percentage Of Credit Transaction With Stockholders	15.00%blx_PercentageOfCreditTransactionWithStockholders / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	20.00%blx_PercentageOfCreditTransactionWithStockholders / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Outstanding Loan Portfolio With Class A And Class B Shareholder	8.00%blx_OutstandingLoanPortfolioWithClassAndClassBShareholder / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	12.00%blx_OutstandingLoanPortfolioWithClassAndClassBShareholder / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Total Outstanding Shares In Percentage	3.50%blx_TotalOutstandingSharesInPercentage / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember

X

- Definition

Outstanding loan portfolio at the Balance sheet date with Class A and Class B shareholders.

+ References

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- Definition

Percentage of credit transaction with stockholders at the end of period.

+ References

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- Definition

Percentage of loans with fixed interest rates maturing in 180 days or less

+ References

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- Definition

Represents the total outstanding shares of the voting capital.

+ References

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- Definition

The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13(h))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.3(a))

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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- Definition

The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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