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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,779,445 $ 1,693,065
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 478,128 476,199
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 881,071 786,210
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 297,819 287,935
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 122,427 $ 142,721