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Loans and reserve for credit losses (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Impaired loans with specific valuation allowances $ 6,701 $ 4,217
Impaired loans, Without a related allowance 973 2,725
Impaired loans, total recorded balance 7,674 6,942
Impaired loans, Unpaid principal balance 11,436 8,680
Impaired loans, Related allowance 2,000 242
Commercial Real Estate Owner Occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with specific valuation allowances 0 1,032
Impaired loans, Without a related allowance 640 2,157
Impaired loans, total recorded balance 640 3,189
Impaired loans, Unpaid principal balance 1,077 4,285
Impaired loans, Related allowance 0 73
Commercial Real Estate Non Owner Occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans with specific valuation allowances 0 646
Impaired loans, Without a related allowance 0 0
Impaired loans, total recorded balance 0 646
Impaired loans, Unpaid principal balance 0 646
Impaired loans, Related allowance 0 5
Commercial real estate portfolio    
Financing Receivable, Impaired [Line Items]    
Impaired loans with specific valuation allowances 0 1,678
Impaired loans, Without a related allowance 640 2,157
Impaired loans, total recorded balance 640 3,835
Impaired loans, Unpaid principal balance 1,077 4,931
Impaired loans, Related allowance 0 78
Construction portfolio    
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 portfolio    
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 portfolio    
Financing Receivable, Impaired [Line Items]    
Impaired loans with specific valuation allowances 6,701 2,539
Impaired loans, Without a related allowance 333 185
Impaired loans, total recorded balance 7,034 2,724
Impaired loans, Unpaid principal balance 10,359 3,366
Impaired loans, Related allowance 2,000 164
Consumer portfolio    
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