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Loans and reserve for credit losses (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances $ 6,565 $ 6,701
Impaired loans, without a related allowance 827 973
Impaired loans, total recorded balance 7,392 7,674
Impaired loans, unpaid principal balance 10,915 11,436
Impaired loans, related allowance 2,000 2,000
Commercial real estate | Owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 0 0
Impaired loans, without a related allowance 490 640
Impaired loans, total recorded balance 490 640
Impaired loans, unpaid principal balance 490 1,077
Impaired loans, related allowance 0 0
Commercial real estate | Non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 0 0
Impaired loans, without a related allowance 0 0
Impaired loans, total recorded balance 0 0
Impaired loans, unpaid principal balance 0 0
Impaired loans, related allowance 0 0
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 0 0
Impaired loans, without a related allowance 490 640
Impaired loans, total recorded balance 490 640
Impaired loans, unpaid principal balance 490 1,077
Impaired loans, related allowance 0 0
Construction | Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 0 0
Impaired loans, without a related allowance 0 0
Impaired loans, total recorded balance 0 0
Impaired loans, unpaid principal balance 0 0
Impaired loans, related allowance 0 0
Residential real estate | Residential real estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 0 0
Impaired loans, without a related allowance 0 0
Impaired loans, total recorded balance 0 0
Impaired loans, unpaid principal balance 0 0
Impaired loans, related allowance 0 0
Commercial and industrial | Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 6,565 6,701
Impaired loans, without a related allowance 337 333
Impaired loans, total recorded balance 6,902 7,034
Impaired loans, unpaid principal balance 10,425 10,359
Impaired loans, related allowance 2,000 2,000
Consumer | Consumer    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 0 0
Impaired loans, without a related allowance 0 0
Impaired loans, total recorded balance 0 0
Impaired loans, unpaid principal balance 0 0
Impaired loans, related allowance $ 0 $ 0