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Investment securities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Amortized Cost $ 176,329 $ 409,288
Unrealized Gross Gain 6,920 10,215
Unrealized Gross Loss 232 3,203
Fair Value 183,017 416,300
Corporate Debt Securities [Member]
   
Amortized Cost 17,064 89,022
Unrealized Gross Gain 322 270
Unrealized Gross Loss 0 2,094
Fair Value 17,386 87,198
Corporate Debt Securities [Member] | Brazil [Member]
   
Amortized Cost 13,581 45,937
Unrealized Gross Gain 158 152
Unrealized Gross Loss 0 2,094
Fair Value 13,739 43,995
Corporate Debt Securities [Member] | Colombia [Member]
   
Amortized Cost 986 28,169
Unrealized Gross Gain 60 89
Unrealized Gross Loss 0 0
Fair Value 1,046 28,258
Corporate Debt Securities [Member] | Peru [Member]
   
Amortized Cost 530 14,916
Unrealized Gross Gain 17 29
Unrealized Gross Loss 0 0
Fair Value 547 14,945
Corporate Debt Securities [Member] | Chile [Member]
   
Amortized Cost 1,967  
Unrealized Gross Gain 87  
Unrealized Gross Loss 0  
Fair Value 2,054  
Sovereign Debt [Member]
   
Amortized Cost 159,265 320,266
Unrealized Gross Gain 6,598 9,945
Unrealized Gross Loss 232 1,109
Fair Value 165,631 329,102
Sovereign Debt [Member] | Brazil [Member]
   
Amortized Cost 28,783 44,541
Unrealized Gross Gain 1,965 2,401
Unrealized Gross Loss 0 376
Fair Value 30,748 46,566
Sovereign Debt [Member] | Colombia [Member]
   
Amortized Cost 15,489 59,204
Unrealized Gross Gain 0 1,682
Unrealized Gross Loss 199 230
Fair Value 15,290 60,656
Sovereign Debt [Member] | Peru [Member]
   
Amortized Cost   25,487
Unrealized Gross Gain   602
Unrealized Gross Loss   0
Fair Value   26,089
Sovereign Debt [Member] | Guatemala [Member]
   
Amortized Cost   5,469
Unrealized Gross Gain   0
Unrealized Gross Loss   19
Fair Value   5,450
Sovereign Debt [Member] | Honduras [Member]
   
Amortized Cost 15,986 16,384
Unrealized Gross Gain 224 0
Unrealized Gross Loss 0 166
Fair Value 16,210 16,218
Sovereign Debt [Member] | Mexico [Member]
   
Amortized Cost 20,553 63,094
Unrealized Gross Gain 1,779 2,456
Unrealized Gross Loss 0 62
Fair Value 22,332 65,488
Sovereign Debt [Member] | Panama [Member]
   
Amortized Cost 37,845 46,796
Unrealized Gross Gain 1,828 2,227
Unrealized Gross Loss 0 61
Fair Value 39,673 48,962
Sovereign Debt [Member] | Venezuela [Member]
   
Amortized Cost 39,548 59,291
Unrealized Gross Gain 801 577
Unrealized Gross Loss 33 195
Fair Value 40,316 59,673
Sovereign Debt [Member] | Chile [Member]
   
Amortized Cost 1,061  
Unrealized Gross Gain 1  
Unrealized Gross Loss 0  
Fair Value $ 1,062