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Financial instruments (Details 15) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Loans and receivables [1] $ 5,419,379,000 $ 5,907,494,000
Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 5,505,658,000 [2] 6,020,731,000
Rating 1-4 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 4,137,949,000 [2] 4,253,805,000
Rating 5-6 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 1,308,950 [2] 1,654,889,000
Rating 7 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 0 [2] 58,673,000
Rating 8 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 23,759,000 [2] 4,000,000
Rating 9 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 0 [2] 35,000,000
Rating 10 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 35,000,000 [2] 14,364,000
Private corporations [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 1,882,846,000 2,655,910,000
Private corporations [Member] | Rating 1-4 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 1,336,032,000 1,714,936,000
Private corporations [Member] | Rating 5-6 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 523,055,000 863,937,000
Private corporations [Member] | Rating 7 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 58,673,000
Private corporations [Member] | Rating 8 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 23,759,000 4,000,000
Private corporations [Member] | Rating 9 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
Private corporations [Member] | Rating 10 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 14,364,000
State-owned corporations [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 723,267,000 786,900,000
State-owned corporations [Member] | Rating 1-4 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 563,877,000 646,797,000
State-owned corporations [Member] | Rating 5-6 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 159,390,000 140,103,000
State-owned corporations [Member] | Rating 7 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
State-owned corporations [Member] | Rating 8 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
State-owned corporations [Member] | Rating 9 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
State-owned corporations [Member] | Rating 10 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
Private banking and financial institutions [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 2,083,795,000 1,738,999,000
Private banking and financial institutions [Member] | Rating 1-4 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 1,729,592,000 1,457,984,000
Private banking and financial institutions [Member] | Rating 5-6 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 354,203,000 281,015,000
Private banking and financial institutions [Member] | Rating 7 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
Private banking and financial institutions [Member] | Rating 8 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
Private banking and financial institutions [Member] | Rating 9 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
Private banking and financial institutions [Member] | Rating 10 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
State-owned banking and financial institutions [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 573,649,000 544,877,000
State-owned banking and financial institutions [Member] | Rating 1-4 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 361,236,000 259,981,000
State-owned banking and financial institutions [Member] | Rating 5-6 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 212,413,000 284,896,000
State-owned banking and financial institutions [Member] | Rating 7 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
State-owned banking and financial institutions [Member] | Rating 8 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
State-owned banking and financial institutions [Member] | Rating 9 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
State-owned banking and financial institutions [Member] | Rating 10 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables [2] 0 0
Private middle-market companies [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 242,101,000 [2] 294,045,000
Private middle-market companies [Member] | Rating 1-4 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 147,212,000 [2] 174,107,000
Private middle-market companies [Member] | Rating 5-6 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 59,889,000 [2] 84,938,000
Private middle-market companies [Member] | Rating 7 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 0 [2] 0
Private middle-market companies [Member] | Rating 8 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 0 [2] 0
Private middle-market companies [Member] | Rating 9 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables 0 [2] 35,000,000
Private middle-market companies [Member] | Rating 10 [member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Loans and receivables $ 35,000,000 [2] $ 0
[1] The carrying value of loans at amortized cost is net of the allowance for expected credit losses of $81.3 million and unearned interest and deferred fees of $5.0 million for December 31, 2017; allowance for expected credit losses of $106.0 million and unearned interest and deferred fees of $7.2 million for December 31, 2016.
[2] Current ratings as of December 31, 2017 and 2016, respectively.