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Investment securities (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Amortized Cost $ 34,113 $ 26,536
Unrealized Gross Gain 58 101
Unrealized Gross Loss 22 0
Fair Value 34,149 26,637
Corporate Debt Securities [Member] | Panama [Member]
   
Amortized Cost 12,660 7,050
Unrealized Gross Gain 0 0
Unrealized Gross Loss 0 0
Fair Value 12,660 7,050
Sovereign Debt [Member]
   
Amortized Cost 21,453 19,486
Unrealized Gross Gain 58 101
Unrealized Gross Loss 22 0
Fair Value 21,489 19,587
Sovereign Debt [Member] | Panama [Member]
   
Amortized Cost 2,000 2,000
Unrealized Gross Gain 45 60
Unrealized Gross Loss 0 0
Fair Value 2,045 2,060
Sovereign Debt [Member] | Colombia [Member]
   
Amortized Cost 13,011 13,015
Unrealized Gross Gain 4 40
Unrealized Gross Loss 3 0
Fair Value 13,012 13,055
Sovereign Debt [Member] | Honduras [Member]
   
Amortized Cost 6,442 4,471
Unrealized Gross Gain 9 1
Unrealized Gross Loss 19 0
Fair Value $ 6,432 $ 4,472