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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net $ 1,340,865 $ 1,209,894 $ 1,176,617
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 365,767 319,590 350,680
Real Estate Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 567,277 493,481 413,058
Real Estate Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 306,218 322,454 322,062
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 101,603 74,369 $ 90,817
Pass [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 1,294,097 1,164,672  
Pass [Member] | Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 357,894 306,066  
Pass [Member] | Real Estate Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 538,130 472,270  
Pass [Member] | Real Estate Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 296,587 312,086  
Pass [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 101,486 74,250  
Special Mention [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 14,699 18,129  
Special Mention [Member] | Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 3,566 6,135  
Special Mention [Member] | Real Estate Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 10,150 9,858  
Special Mention [Member] | Real Estate Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 983 2,123  
Special Mention [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net   13  
Substandard [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 32,069 27,093  
Substandard [Member] | Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 4,307 7,389  
Substandard [Member] | Real Estate Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 18,997 11,353  
Substandard [Member] | Real Estate Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net 8,648 8,245  
Substandard [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans, net $ 117 $ 106