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Loans, net and allowance for loan losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details 5) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net $ 1,270,545 $ 1,209,894
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 342,937 319,590
Real Estate Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 529,499 493,481
Real Estate Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 306,740 322,454
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 91,369 74,369
Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 1,218,996 1,164,672
Pass [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 329,803 306,066
Pass [Member] | Real Estate Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 502,017 472,270
Pass [Member] | Real Estate Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 295,998 312,086
Pass [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 91,178 74,250
Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 15,523 18,129
Special Mention [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 3,690 6,135
Special Mention [Member] | Real Estate Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 10,395 9,858
Special Mention [Member] | Real Estate Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 1,438 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 36,026 27,093
Substandard [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 9,444 7,389
Substandard [Member] | Real Estate Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 17,087 11,353
Substandard [Member] | Real Estate Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net 9,304 8,245
Substandard [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans, net $ 191 $ 106