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Consolidated balance sheets [Parenthetical] (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Interest-bearing deposits in banks, pledged deposits	$ 39,210us-gaap_RestrictedCashAndCashEquivalents	$ 9,032us-gaap_RestrictedCashAndCashEquivalents
Securities available-for-sale, pledged securities to creditors	307,530us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral	296,811us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Securities held-to-maturity, fair value	53,295us-gaap_HeldToMaturitySecuritiesFairValue	33,634us-gaap_HeldToMaturitySecuritiesFairValue
Securities held-to-maturity, pledged securities to creditors	13,004us-gaap_HeldToMaturitySecuritiesPledgedAsCollateral	13,007us-gaap_HeldToMaturitySecuritiesPledgedAsCollateral
Equipment and leasehold improvements, accumulated depreciation and amortization	$ 16,203us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	$ 13,881us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Class A common stock [Member]
Common stock, no par value (in dollars per share)	$ 0us-gaap_CommonStockNoParValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	$ 0us-gaap_CommonStockNoParValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, assigned value (in dollars per share)	$ 6.67us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	$ 6.67us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, Authorized	40,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	40,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Common stock, outstanding	6,342,189us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	6,342,189us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B common stock [Member]
Common stock, no par value (in dollars per share)	$ 0us-gaap_CommonStockNoParValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	$ 0us-gaap_CommonStockNoParValue / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, assigned value (in dollars per share)	$ 6.67us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	$ 6.67us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, Authorized	40,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	40,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Common stock, outstanding	2,479,050us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	2,520,422us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Class E common stock [Member]
Common stock, no par value (in dollars per share)	$ 0us-gaap_CommonStockNoParValue / us-gaap_StatementClassOfStockAxis = blx_CommonClassEMember	$ 0us-gaap_CommonStockNoParValue / us-gaap_StatementClassOfStockAxis = blx_CommonClassEMember
Common stock, assigned value (in dollars per share)	$ 6.67us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = blx_CommonClassEMember	$ 6.67us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = blx_CommonClassEMember
Common stock, Authorized	100,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = blx_CommonClassEMember	100,000,000us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = blx_CommonClassEMember
Common stock, outstanding	29,956,100us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = blx_CommonClassEMember	29,710,556us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = blx_CommonClassEMember

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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