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Business segment information (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Reporting Segment [Line Items]      
profit for the year $ 63,593 $ 86,053 $ 11,138
Impairment loss on non-financial assets (296) (500) 5,967
Assets 6,288,898 7,249,666 7,609,185
Other assets - unallocated 6,816 8,857  
Liabilities 5,250,978 6,233,499 6,615,595
Other liabilities - unallocated 18,714 17,149  
Reportable segments [member]      
Disclosure of Reporting Segment [Line Items]      
profit for the year 63,593 86,053 15,189
Assets 6,282,090 7,240,835 7,592,492
Liabilities 5,232,264 6,216,350 6,601,980
Unallocated amounts [member]      
Disclosure of Reporting Segment [Line Items]      
Impairment loss on non-financial assets 0 0 (4,051)
Other assets - unallocated 6,808 8,831 16,693
Other liabilities - unallocated $ 18,714 $ 17,149 $ 13,615