Commitments and contingencies (Tables) |
9 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Sep. 30, 2017 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Commitments and Contingencies Disclosure [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] | The Company had outstanding the following approximate off-balance-sheet financial instruments whose contract amounts represent credit risk at the dates indicated (dollars in thousands):
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