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Loans and reserve for credit losses (Impaired Financing Receivables) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances $ 5,490 $ 8,887
Impaired loans, Without a related allowance 28,371 31,580
Impaired loans, Total recorded balance 33,861 40,467
Impaired loans, Unpaid principal balance 37,296 44,856
Impaired loans, Related allowance 201 783
Commercial Real Estate Owner Occupied
   
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 1,620 2,772
Impaired loans, Without a related allowance 4,238 6,582
Impaired loans, Total recorded balance 5,858 9,354
Impaired loans, Unpaid principal balance 8,463 12,707
Impaired loans, Related allowance 153 652
Commercial Real Estate Non Owner Occupied
   
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 1,104 1,116
Impaired loans, Without a related allowance 21,682 21,757
Impaired loans, Total recorded balance 22,786 22,873
Impaired loans, Unpaid principal balance 22,864 22,904
Impaired loans, Related allowance 19 13
Commercial Real Estate
   
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 2,724 3,888
Impaired loans, Without a related allowance 25,920 28,339
Impaired loans, Total recorded balance 28,644 32,227
Impaired loans, Unpaid principal balance 31,327 35,611
Impaired loans, Related allowance 172 665
Construction
   
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 0 751
Impaired loans, Without a related allowance 963 1,236
Impaired loans, Total recorded balance 963 1,987
Impaired loans, Unpaid principal balance 963 2,029
Impaired loans, Related allowance 0 0
Residential real estate
   
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 0 174
Impaired loans, Without a related allowance 461 256
Impaired loans, Total recorded balance 461 430
Impaired loans, Unpaid principal balance 582 515
Impaired loans, Related allowance 0 62
Commercial and industrial loans
   
Financing Receivable, Impaired [Line Items]    
Impaired loans, With specific valuation allowances 2,766 4,074
Impaired loans, Without a related allowance 1,027 1,749
Impaired loans, Total recorded balance 3,793 5,823
Impaired loans, Unpaid principal balance 4,424 6,701
Impaired loans, Related allowance 29 56
Consumer Loans
   
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