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Premises and equipment (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property Plant And Equipment Abstract      
Depreciation $ 10.2us-gaap_Depreciation $ 10.3us-gaap_Depreciation $ 4.8us-gaap_Depreciation