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Cash and cash equivalents (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Interest-Bearing Deposits In Banks    
Short-term deposits, classified as cash equivalents $ 661,016 $ 979,882
Pledged deposits    
Other cash and cash equivalents 53,241 61,812
Time deposits [Member]    
Interest-Bearing Deposits In Banks    
Short-term deposits, classified as cash equivalents [1] $ 0 $ 125,000
Deposit Interest Rate Percentage [1] 0.00%  
Time deposits [Member] | Bottom of range [member]    
Interest-Bearing Deposits In Banks    
Deposit Interest Rate Percentage [1]   0.83%
Time deposits [Member] | Top of range [member]    
Interest-Bearing Deposits In Banks    
Deposit Interest Rate Percentage [1]   0.88%
Demand Deposit [Member]    
Interest-Bearing Deposits In Banks    
Short-term deposits, classified as cash equivalents [2] $ 661,016 $ 854,882
Demand Deposit [Member] | Bottom of range [member]    
Interest-Bearing Deposits In Banks    
Deposit Interest Rate Percentage 0.25% [2] 0.01%
Demand Deposit [Member] | Top of range [member]    
Interest-Bearing Deposits In Banks    
Deposit Interest Rate Percentage [2] 1.55% 0.77%
New york [Member]    
Pledged deposits    
Other cash and cash equivalents [3] $ 3,000 $ 2,800
Pleged Deposists Interest Rate Percentage [3] 0.00% 0.00%
Panama [Member]    
Pledged deposits    
Other cash and cash equivalents [4] $ 50,241 $ 59,012
Pleged Deposists Interest Rate Percentage [4] 1.42% 0.66%
[1] Time deposits “overnight” calculated on an average interest rate.
[2] Demand deposits with bearing interest based on the daily rates determined by banks.
[3] The New York Agency had a pledged deposit with the New York State Banking Department, as required by law since March 1994.
[4] The Bank had pledged deposits to secure derivative financial instruments transactions.