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Risk management (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets [abstract]      
Cash and cash equivalent $ 672,048 $ 1,069,538  
Equity investments 8,402 0  
Loans at amortized cost 5,505,658 6,020,731  
Unearned interest and deferred fees (4,985) (7,249)  
Allowance for expected credit losses (81,294) (105,988) $ (89,974)
Total 6,267,747 7,180,783  
Liabilities [abstract]      
Total 5,224,935 6,169,469  
Liquidity risk [member]      
Assets [abstract]      
Cash and cash equivalent 672,048 1,069,538  
Investment securities 85,667 107,821  
Equity investments 8,402    
Loans at amortized cost 5,505,658 6,020,731  
Unearned interest and deferred fees (4,985) (7,249)  
Allowance for expected credit losses (81,294) (105,988)  
Other assets 82,251 95,930  
Total 6,267,747 7,180,783  
Liabilities [abstract]      
Deposits 2,928,844 2,802,852  
Other liabilities 2,296,091 3,366,617  
Total 5,224,935 6,169,469  
Confirmed letters of credit 273,449 383,760  
Stand-by letters of credit and guaranteed - Commercial risk 168,976 9,025  
Credit commitments 45,578 10,250  
Total 488,003 403,035  
Net position 554,809 608,279  
Up to 3 months [member] | Liquidity risk [member]      
Assets [abstract]      
Cash and cash equivalent 672,048 1,069,538  
Investment securities 700 1,024  
Equity investments 0    
Loans at amortized cost 1,926,787 2,262,349  
Unearned interest and deferred fees (472) (663)  
Allowance for expected credit losses 0 0  
Other assets 31,282 55,445  
Total 2,630,345 3,387,693  
Liabilities [abstract]      
Deposits 1,722,041 2,306,413  
Other liabilities 806,547 884,453  
Total 2,528,588 3,190,866  
Confirmed letters of credit 169,042 146,755  
Stand-by letters of credit and guaranteed - Commercial risk 18,687 70  
Credit commitments 0 0  
Total 187,729 146,825  
Net position (85,972) 50,002  
3 to 6 months [member] | Liquidity risk [member]      
Assets [abstract]      
Cash and cash equivalent 0 0  
Investment securities 279 3,000  
Equity investments 0    
Loans at amortized cost 1,175,801 1,267,194  
Unearned interest and deferred fees (479) (906)  
Allowance for expected credit losses 0 0  
Other assets 8,635 6,587  
Total 1,184,236 1,275,875  
Liabilities [abstract]      
Deposits 411,158 173,288  
Other liabilities 151,090 744,135  
Total 562,248 917,423  
Confirmed letters of credit 101,403 173,192  
Stand-by letters of credit and guaranteed - Commercial risk 72,080 8,595  
Credit commitments 15,000 4,073  
Total 188,483 185,860  
Net position 433,505 172,592  
6 months to 1 year [member] | Liquidity risk [member]      
Assets [abstract]      
Cash and cash equivalent 0 0  
Investment securities 7,000 0  
Equity investments 0    
Loans at amortized cost 922,711 551,794  
Unearned interest and deferred fees (223) (258)  
Allowance for expected credit losses 0 0  
Other assets 13,175 3,721  
Total 942,663 555,257  
Liabilities [abstract]      
Deposits 571,500 275,631  
Other liabilities 291,694 346,294  
Total 863,194 621,925  
Confirmed letters of credit 3,004 63,813  
Stand-by letters of credit and guaranteed - Commercial risk 77,952 360  
Credit commitments 0 2,399  
Total 80,956 66,572  
Net position (1,487) (133,240)  
1 to 5 years [member] | Liquidity risk [member]      
Assets [abstract]      
Cash and cash equivalent 0 0  
Investment securities 77,688 83,643  
Equity investments 0    
Loans at amortized cost 1,386,161 1,843,476  
Unearned interest and deferred fees (3,546) (4,762)  
Allowance for expected credit losses 0 0  
Other assets 3,819 6,399  
Total 1,464,122 1,928,756  
Liabilities [abstract]      
Deposits 224,145 47,520  
Other liabilities 979,958 1,330,515  
Total 1,204,103 1,378,035  
Confirmed letters of credit 0 0  
Stand-by letters of credit and guaranteed - Commercial risk 257 0  
Credit commitments 30,000 3,200  
Total 30,257 3,200  
Net position 229,762 547,521  
More than 5 years [member] | Liquidity risk [member]      
Assets [abstract]      
Cash and cash equivalent 0 0  
Investment securities 0 20,756  
Equity investments 0    
Loans at amortized cost 94,198 95,918  
Unearned interest and deferred fees (248) (660)  
Allowance for expected credit losses 0 0  
Other assets 9,398 642  
Total 103,348 116,656  
Liabilities [abstract]      
Deposits 0 0  
Other liabilities 66,802 61,220  
Total 66,802 61,220  
Confirmed letters of credit 0 0  
Stand-by letters of credit and guaranteed - Commercial risk 0 0  
Credit commitments 578 578  
Total 578 578  
Net position 35,968 54,858  
Without Maturity [Member] | Liquidity risk [member]      
Assets [abstract]      
Cash and cash equivalent 0 0  
Investment securities 0 (602)  
Equity investments 8,402    
Loans at amortized cost 0 0  
Unearned interest and deferred fees (17) 0  
Allowance for expected credit losses (81,294) (105,988)  
Other assets 15,942 23,136  
Total (56,967) (83,454)  
Liabilities [abstract]      
Deposits 0 0  
Other liabilities 0 0  
Total 0 0  
Confirmed letters of credit 0 0  
Stand-by letters of credit and guaranteed - Commercial risk 0 0  
Credit commitments 0 0  
Total 0 0  
Net position $ (56,967) $ (83,454)