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Loans and reserve for credit losses (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances $ 1,730 $ 4,217
Impaired loans, Without a related allowance 10,270 2,725
Impaired loans, total recorded balance 12,000 6,942
Impaired loans, Unpaid principal balance 16,500 8,680
Impaired loans, Related allowance 152 242
Commercial real estate | Owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 848 1,032
Impaired loans, Without a related allowance 1,159 2,157
Impaired loans, total recorded balance 2,007 3,189
Impaired loans, Unpaid principal balance 3,067 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 636 646
Impaired loans, Without a related allowance 1,904 0
Impaired loans, total recorded balance 2,540 646
Impaired loans, Unpaid principal balance 2,540 646
Impaired loans, Related allowance 20 5
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 1,484 1,678
Impaired loans, Without a related allowance 3,063 2,157
Impaired loans, total recorded balance 4,547 3,835
Impaired loans, Unpaid principal balance 5,607 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 246 2,539
Impaired loans, Without a related allowance 7,207 185
Impaired loans, total recorded balance 7,453 2,724
Impaired loans, Unpaid principal balance 10,893 3,366
Impaired loans, Related allowance 78 164
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