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Loans and reserve for credit losses (Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances $ 1,497 $ 4,217
Impaired loans, Without a related allowance 11,312 2,725
Impaired loans, Total recorded balance 12,809 6,942
Impaired loans, Unpaid principal balance 17,267 8,680
Impaired loans, Related allowance 201 242
Owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 589 1,032
Impaired loans, Without a related allowance 1,974 2,157
Impaired loans, Total recorded balance 2,563 3,189
Impaired loans, Unpaid principal balance 3,649 4,285
Impaired loans, Related allowance 52 73
Non-owner occupied    
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 638 646
Impaired loans, Without a related allowance 1,931 0
Impaired loans, Total recorded balance 2,569 646
Impaired loans, Unpaid principal balance 2,568 646
Impaired loans, Related allowance 5 5
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 1,227 1,678
Impaired loans, Without a related allowance 3,905 2,157
Impaired loans, Total recorded balance 5,132 3,835
Impaired loans, Unpaid principal balance 6,217 4,931
Impaired loans, Related allowance 57 78
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    
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    
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 270 2,539
Impaired loans, Without a related allowance 7,407 185
Impaired loans, Total recorded balance 7,677 2,724
Impaired loans, Unpaid principal balance 11,050 3,366
Impaired loans, Related allowance 144 164
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