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Loans, net and allowance for loan losses - Major Classifications of Loans Outstanding (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 1,881,090 $ 1,823,266
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 497,985 494,134
Real estate Commercial    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 976,258 907,803
Real estate Residential    
Accounts, Notes, Loans and Financing Receivable    
Loans, net 299,209 299,876
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Loans, net $ 107,638 $ 121,453