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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (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