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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,858,799 $ 1,823,266
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 513,655 494,134
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 935,578 907,803
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 298,527 299,876
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 111,039 $ 121,453