Commitments and contingencies (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2016 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commitments and Contingencies Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] | At December 31, 2016 and 2015, the Company had outstanding the following approximate off-balance-sheet financial instruments whose contract amounts represent credit risk (in thousands):
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