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Loans and reserve for credit losses (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances $ 1,523 $ 4,217
Impaired loans, without a related allowance 10,277 2,725
Impaired loans, total recorded balance 11,800 6,942
Impaired loans, unpaid principal balance 16,067 8,680
Impaired loans, related allowance 99 242
Commercial real estate | Owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 815 1,032
Impaired loans, without a related allowance 1,004 2,157
Impaired loans, total recorded balance 1,819 3,189
Impaired loans, unpaid principal balance 2,437 4,285
Impaired loans, related allowance 54 73
Commercial real estate | Non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 632 646
Impaired loans, without a related allowance 1,878 0
Impaired loans, total recorded balance 2,510 646
Impaired loans, unpaid principal balance 2,511 646
Impaired loans, related allowance 20 5
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 1,447 1,678
Impaired loans, without a related allowance 2,882 2,157
Impaired loans, total recorded balance 4,329 3,835
Impaired loans, unpaid principal balance 4,948 4,931
Impaired loans, related allowance 74 78
Construction | Construction    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 0 0
Impaired loans, without a related allowance 0 365
Impaired loans, total recorded balance 0 365
Impaired loans, unpaid principal balance 0 365
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 18
Impaired loans, total recorded balance 0 18
Impaired loans, unpaid principal balance 0 18
Impaired loans, related allowance 0 0
Commercial and industrial | Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Impaired loans, with specific valuation allowances 76 2,539
Impaired loans, without a related allowance 7,395 185
Impaired loans, total recorded balance 7,471 2,724
Impaired loans, unpaid principal balance 11,119 3,366
Impaired loans, related allowance 25 164
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