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Equipment and leasehold improvements (Details Textual) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
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Jun. 30, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Gain on sale of premises and equipment | $ 5,600 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | $ 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | [1] | $ 0 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | [1] | $ 5,626 us-gaap_GainLossOnSaleOfPropertyPlantEquipment | [1]
[1] | The numbers set out in these tables have been rounded and accordingly may not total exactly.

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration